How To Change Package Name In Eclipse?

In pack explorer of eclipse> Single Click on the name of Package> click F2 keyboard key >type new name> click finish. Eclipse will do the rest of job. It will rename old package name to new in code files also.
Select Navigate > Go To > Package from the menu bar. The Go to Package dialog opens.

How do I change the default package in Eclipse?

How do I change the default package in eclipse? You can’t rename default package since it actually doesn’t even exist. All files in default package are actually in src folder. Just create new package and move your classes within. Select the classes you want to move to a different package name. Click to see full answer.

How do I change the name of a Java package?

Select Navigate > Go To > Package from the menu bar. The Go to Package dialog opens. Type a package name in the Choose a package field to narrow the list of available packages, using wildcards as needed. Select a package from the list, then click OK. In respect to this, can we change package name Java?

How do I find the package name in Eclipse?

Click on the root package and start typing the name of the package you are looking for. Show activity on this post. Ctrl + Shift + T works for packages too: Just type the package name and then a dot and it will show all classes in matching packages.

How do I Refactor a package in Eclipse?

Refactoring using Eclipse

  1. Right clicking on a Java element in the Package Explorer view and selecting Refactor menu item.
  2. Right clicking on a Java element in the Java editor and selecting Refactor menu item.
  3. Selecting a Java element in either the Package Explorer view or Java Editor and clicking Shift + Alt + T.

Can you rename packages in Java?

Rename a package

In the Project tool window, click Project and select Packages from the list. Right-click the package you want to rename and from the context menu, select Refactor | Rename ( Shift+F6 ).

What is the package name in Java?

A java package is a group of similar types of classes, interfaces and sub-packages. Package in java can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc.

How do I change my package name on Play Store?

Nope, you cannot just change it, you would have to upload a new package as a new app. Have a look at the Google’s app Talk, its name was changed to Hangouts, but the package name is still com. google. android.

Can I change package name in firebase?

A package name is often referred to as an application ID. Find your app’s package name in your module (app-level) Gradle file, usually app/build. Be aware that the package name value is case-sensitive, and it cannot be changed for this Firebase Android app after it’s registered with your Firebase project.

How do I find my ADB package name?

To list the package names as well as the path to the installed APK files, use the “ -f ” option. The “ -f ” option can be combined with the other options as well. For example, to list system package names with the installed package location, use the “ -f -s ” option.

How do I package a package in Eclipse?

Creating packages and sub packages within Eclipse – Murp01/DemoMavenEclipseProject Wiki

  1. Right-click in the source folder where you want package,
  2. Right-Click > New package.
  3. Right-click on new packages and select ‘New package’ again.

How do I rename a spring boot package?

You can rename the spring boot package name by using the finalName tag.

How do I get Package Explorer in Eclipse?

Package Explorer

  1. To bring the Package Explorer back, navigate under the Window menu to the Show View submenu, and select Package Explorer.
  2. The Package Explorer subwindow should then reappear right was before you closed it.

How do I Refactor a name in Eclipse?

Select the element in the JDT editor and then select Refactor→ Rename, or right-click the element and select Refactor→ Rename. Enter the new name you want to give the item, and you’re set.

How do I rename a class in Eclipse?

Right click file -> Refactor -> Rename. Show activity on this post. You can rename classes or any file by hitting F2 on the filename in Eclipse. It will ask you if you want to update references.

What is the default package name in Java?

Java compiler imports java. lang package internally by default. It provides the fundamental classes that are necessary to design a basic Java program.

How to create a simple Maven project in Eclipse?

In Eclipse, click File > New > Project… and choose Maven > Maven project from the New project wizard: In the New Maven Project dialog, check the option Create a simple project (skip archetype selection): Then enter project name and specify information for the Maven project as below: Choose the packaging type is pom. Click Finish.

How to completely rename Maven project in Eclipse?

  • Right-click the project and select ‘ Rename/Move ‘
  • In the Move Remote Resource dialog that comes up,be sure that the desired remote folder in which the project is to reside is highlighted.
  • Type in the new project name and click Finish.
  • How to find package by name in Eclipse?

    How to find package explorer in Java eclipse project? Java 8 Object Oriented Programming Programming. To view the project explorer, click on Window menu then, click on Show View and select Project Explorer. There is simpler way to open project explorer, when you are in the editor press alt + shift + w and select project explorer.

    How to change a package name in Eclipse?

    COPY AND PASTE AN ANDROID PROJECT – HOW TO?A.If you are using Eclipse and all you want to do is first open the project that you want to copy (DO NOT COPY THE PROJECT), then that is all you need to do ″If you haven’t already, open the project that you want to copy and then clone (copy/paste) your Android project into the explorer package window on the left side of Eclipse’s main window.

    When you paste, Eclipse will prompt you to enter a new project name.Create a new project name for it.Due to the fact that the Eclipse project name and directory are independent of the application name and package, the following steps will guide you through the process of updating package names.

    • Please keep in mind that there are two sorts of package names.
    • 1.The following actions should be followed in order to update the src package names of packages within the Src folder: To begin, you must first build a new package as follows: To create a package, right-click on the source code and select ″New Package.″ com.new.name is an example of a package that was created.
    • The Java files from the previous copied package in part A should be moved to your new package by following the methods outlined here.
    • Choose the Java files that are contained within the old package.
    • Right-click on the java files to open them.
    1. make use of the ″Refactor″ option choose the ″Move″ option From the list of packages displayed in a dialogue box, select the package that you want.
    2. Most likely, you’ll need to pick the new one you just established and then press ″OK″ to proceed.
    3. 2.To modify the name of the application package (main package), follow the steps outlined below: To begin, right-click your project.

    Then pick ″Rename Application package″ from the ″Android tools″ drop-down menu.In the dialogue box that appears, type in a new name and click OK.Then it will tell you where in your project the name of the application will be changed and how to do it.It will demonstrate that the name of the application will be updated in the manifest as well as in the majority of important Java files.Once you click ″OK,″ you are finished with this section; however, you must rebuild your project in order for it to take effect.When you’re ready to rebuild your project, pick ″Project″ >>> ″Clean″ >>>> select a Project from a selection of projects, and then click ″OK.″ ″…..

    Finally, you will be able to begin working on your new project.

    How do I change the default package in eclipse?

    You are unable to rename the default package since it does not exist in the first place.All of the files in the default package are located in the src folder.Simply create a new package and move your classes into it.

    Simple as that.Identify the classes that you wish to rename and move them to a new package.The default package is an unnamed package, which means it has no name.

    • It comprises java classes whose source files did not have a package declaration because they are included in an unnamed package.
    • The default packahe is intended to provide ease for constructing tiny or temporary apps, as well as when just getting started with programming.
    • Second, what is the best way to run a package in Eclipse?
    • Taking a Package Open
    1. From the menu bar, choose Navigate > Go To > Package from the submenu. The dialog box labeled ″Go to Package″ appears.
    2. Enter a package name in the Choose a package area to restrict the list of possible packages
    3. wildcards may be used to help you narrow the results.
    4. Choose a bundle from the drop-down menu, and then click OK.

    As a result, is it possible to modify the name of the Java package?A change in the package name of an Android application can be accomplished by following the procedures shown below.Right-click on the java files for which you wish to alter the package names and select ″Change Package Names″ from the menu.

    From the pop-up menu, choose Refactor -> Move as the action.What is the default package in the Eclipse development environment?They are grouped together under the ″default package″ node in the hierarchical structure.

    • In this case, because your class is not assigned to a package, it will be grouped with all of the other non-packaged classes in the default package.
    • In Eclipse, you can create a new package by right-clicking on your project and selecting New > Package from the context menu.

    How to change package name of Android Project in Eclipse?

    • There is a flaw in the Eclipse Android tools that is causing this. What has to be done to remedy it: Right-click on the project and select Android tools -> Rename application package from the context menu. Additionally, verify that AndroidManifest.xml has been updated successfully. However, in my instance, it did not, and this should resolve the issue. As is customary, you may rename or alter the package name by hitting F2 on the package name, and you can also change or rename the package name by right-clicking on the package name and selecting Rename from the context menu. When you press the F2 key, the following dialog box will appear: Don’t forget to click the ″Update references″ option in this dialog box since checking this box will cause changes to be made to all of the references in the package that are referred to by other components of the project. None of these worked for me, and they all brought faults into the system. I found the following to be effective: Android Tools >> Rename Application Package may be accessed by selecting Android Tools >> Rename Application Package from the context menu.
    • Fill up the blanks with the new Package name.
    • Accept all of the automated modifications that it wants to make
    • accept the results.
    • Say ″yes″ to the request to upgrade the launch configuration.
    1. A defect exists in the Eclipse Android tools, which is being addressed here: What has to be done to make it right: Then select Android tools -> Rename application package from the context menu by right-clicking on the project.
    2. Also, make sure that AndroidManifest.xml has been updated appropriately to ensure that everything works properly.
    3. However, this was not the case in my situation, which should resolve the issue.
    4. As is customary, you can rename or alter the package name by hitting F2 on the package name, and you can also change or rename the package name by right-clicking and selecting Rename from the context menu.
    5. It will appear in the following format if you hit the F2 key: Don’t forget to click the ″Update references″ option in this dialog box since checking this box will cause changes to be made to all of the references in the package that are referred to by other components of the project when the package is modified.
    6. For me, none of these were effective; they all produced mistakes.

    What I found to be successful was as follows: When you right-click the project, choose Android Tools >> Rename Application Package from the drop-down menu.Enter the new Package name in the appropriate field.Please accept all of the automated modifications that the system wishes to make.Declare that you agree with the launch configuration being updated.

    1. Go ahead and make changes to the manifest.
    2. Get rid of any obsolete package names that appear in the manifest
    3. In every position inside the manifest, replace the old package name with the new package name by using the new package name. It’s possible that you’ll have classes (Activities, to be precise) that require direct package name references.
    4. Keep the manifest on hand
    5. Then, inside the project, right-click the package name to choose it.
    6. Choose ″Refactor″ and ″Rename″ from the drop-down menus.
    7. Fill in the blanks with the new package name
    8. Select ″update references″ from the drop-down menu.
    9. Once you click OK, you’re finished, but keep an eye out for what has to be done to replace the old name.
    10. Don’t forget to change the layout XML files as well, so that they reflect the new package name. It’s possible that you have a custom View. Look for them if you can.

    Click on your project name and select Android Tools from the context menu. Then click Rename Application Package, change your project name and click OK to go to the Finish screen.

    Comments

    1. Eclipse will take care of the remainder of the work. It will also rename the old package name to the new package name in the code files
    2. As is customary, you may rename or alter the package name by hitting F2 on the package name, and you can also change or rename the package name by right-clicking on the package name and selecting Rename from the context menu. When you press the F2 key, the following dialog box will appear: In this window, be sure to click the ″Update references″ checkbox, since doing so will cause all of the package’s references that are referenced to by other project components to be updated. In Eclipse, you may rename classes or any other file by using the F2 key while hovering over the filename. It will inquire as to whether you wish to update your references.
    3. As is customary, you may rename or alter the package name by hitting F2 on the package name, and you can also change or rename the package name by right-clicking on the package name and selecting Rename from the context menu. When you hit the F2 key, you will be presented with the following dialog box: The project name is often the first section of the package name after the org. eclipse prefix, followed by the component name
    4. The first stage in the process of renaming the package has now been accomplished. The next step is to rename the package using the Android Tools that can be accessed within the IDE. Alternatively, right-click the ″Project Name″ in the Project Explorer window, then pick ″Android Tools,″ and finally select ″Rename Application Package″
    5. Alternatively, right-click your project name and select Android Tools, then select Rename Application Package, then update your project name. click on OK and then on Finish
    6. Creating a new package, dragging and dropping the class into it, and renaming the new package are all possible solutions to your problem. Questions: Answers: In the eclipse pack explorer, select Single. Click on the name of the package> press the F2 keyboard key > enter a new name> press the Finish button. Eclipse will take care of the remainder of the work.
    7. Right-click the package you wish to relocate and choose ″ Refactor/Rename″ from the context menu – NOT ″ Move ″! Modify the package’s name to reflect the desired new position in the hierarchy
    8. Learn how to rename the name of an application package in Eclipse. You may accomplish this with the use of refractor and Android tools. Watch the basic steps and follow them as closely as possible
    9. Changing the package name of an Android application is critical since many of them are developed in Android Studio, and the package level names are not visible in Eclipse.
    10. You’ll see a pop-up window with your project’s existing name
    11. modify it if you want it to be different. After that, click on the OK button. Continuation of Reading
    12. Summary: The package name of an Android application can be modified by following the instructions outlined in this section. Choose the java files that you want to use from the list
    13. Changing the package name of an Android application is an essential component of the development process.
    14. Additionally, altering the package name was a rather simple operation for the Eclipse
    15. Does anybody know how to rename packages in the new Intellijj-based IDE Android Studio? Is there anyapp) and replace the applicationId to the name of the desired package
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    Comments are closed.

    Safely Moving and Renaming Packages and Folders in Eclipse

    Comp310: Using Eclipse to Move and Rename Packages and Folders in a Secure Manner

    WARNING!

    • When moving or renaming packages and directories, the Eclipse and Subclipse environments do not communicate effectively. Moving or renaming directories as one could normally do in Eclipse using nearly any method is very likely to result in conflicts between Eclipse and Subversion, which will prohibit code from being committed to the repository and causing it to fail to commit. IMPORTANT: DO NOT EVER manipulate a folder from outside the Eclipse environment, such as through a file manager.
    • To move a package or folder to a new location in Eclipse, just drag & drop it there.
    • In Eclipse, you may rename a folder or refactor a whole folder.

    A Safe(r) Procedure

    1. It looks that the procedures outlined here are relatively safe, but if you experience any difficulties, contact the course personnel immediately!
    2. Moving a package or folder requires that you do not make any changes to any files or do anything else with your system until the entire procedure is complete!
    3. Please notify the course staff as soon as possible if you find any difficulties and DO NOT PROCEED.

    Make a complete backup of your codebase. Check to see that EVERYONE on your team has likewise completely committed their code! Make certain that everything has the little yellow cylinders and that there are no black asterisks on anything. Until the procedure is complete, do not allow any colleagues to work on the impacted package(s).

    There are two alternative ways (see the specific case below if you are only altering the capitalizations of a folder and not changing its spelling or location): 1) Change the capitalizations of the folder and 2) Change the spelling of the folder and its location.

    Rename the package to something more appropriate (works even when there are sub-packages)

    Ensure that the package does not already exist as a sub-package in another ″parent″ package before transferring it there. If the parent package already exists, ensure that there are no other sub-packages with the same name as the package you are moving. If the parent package does not already exist, there is no need to create it.

    • Select ″Refactor/Rename″ from the context menu of the package you wish to relocate. – NOT ″Move″ in any way
    • Modify the package’s name to reflect its intended new position in the package hierarchy, for example, ″pkg1″ to ″pkg2.″
    • Add any new parent package names to the end of a package name if you are moving it downwards in the package hierarchy. Remove any new parent package names from the end of a package name if you are moving it up in the package hierarchy.
    1. Make certain that the ″Update references″ and ″Rename subpackages″ options are selected.
    2. To proceed, click ″Ok.″

    Alternatively, you might move all of the files in the package (works only if there are no sub-packages)

    1. Create a new empty package in the location where you want the files to be stored.
    2. Then, by right-clicking on the required files and selecting ″Refactor/Move,″ you may REFACTOR all of the FILES in the old package in order to transfer them to the new package. – Please do not just drag and drop the files!
    3. When you’re through, you should have nothing left in the original packaging.
    1. Make certain that the ″Update references.″ option is selected
    2. then click ″Ok.″
    • Make a complete backup of your codebase.
    • Open the SVN Exploring Perspective in a new window. If the original package is still present in the repository, remove the empty original package from the repository. If it still includes material, DO NOT remove it since this indicates that the transferring operation did not finish correctly! Inquire for assistance
    1. Make a Team/Update to Head to ensure that you have the most up-to-date version. The old package should be removed as a result, if it hasn’t already been done so previously.
    2. Organize your project by cleaning it: If you move packages, it is possible that Eclipse will go out of sync with its code files, resulting in bizarre problems where Eclipse complains about not recognizing specific classes in perfectly legitimate code.
    1. In Eclipse, select ″Project/Clean″ from the main menu bar.
    2. Make certain that the desired project is selected in the pop-up dialog box that appears.
    3. To have Eclipse erase all of the compiled files in the project’s bin directory, select OK from the File menu.
    4. The project’s auto-compile setting (the default is ″Build Automatically″) will quickly and automatically recompile everything, resyncing with the code files, and any bogus errors should be removed from the project’s code files. If the project has not been configured for auto-compilation, explicitly choose ″Project/Build All″ from the drop-down menu.
    • Make a complete backup of your codebase.
    • Inform ALL team members that their projects have been updated: Right-click the whole project in the Java Perspective and pick Team/Update to Head from the context menu.

    Special Case for Just Changing the Capitalization of a Package/Folder

    1. According to the technical specifications, this is an issue exclusively on Windows computers, because the operating system ignores the case of folder names.
    2. This technique, on the other hand, is strongly encouraged for the sake of safety for ALL systems.
    3. When just altering the capitalization of a package or folder (as opposed to relocating it), the operating system does not necessarily generate a new, separate folder to store the new capitalization information.
    4. Subversion, on the other hand, makes the assumption that a new folder has been created.
    5. Attempting to commit a folder that has been merely re-capitalized may result in data loss.
    6. It is important to note that this problem does not apply when transferring folders to a new place when the name is the same but for the capitalization of the first letter.

    In order to resolve this issue, the contents of the original package/folder must be moved twice: first into a temporary package/folder and then once into the final, correctly capitalized package/folder.The process of making in-place capitalization changes to the name of a package or folder

    1. Carry out the steps outlined above to relocate all of the contents of the original package to a temporary package (or any other package with a distinguishable name, such as originalPackage temp).
    2. Having deleted the original package, construct the final package you wish, ensuring that any capitalization errors have been rectified
    3. Carry through the steps outlined above to transfer all of the contents of the temporary folder to the new ultimate destination folder, as needed.

    © 2017 by Stephen Wong

    How to find package by name in Eclipse?

    1. The combination of Ctrl+Shift+T works for packages as well: Simply enter the package name followed by a dot, and the system will display all classes in the matching packages.
    2. In order to do prefix matching, begin with a dot or a star on the screen.
    3. It is critical to conclude the search string with a dot; otherwise, the final word will be utilized to match against class names, as seen below: com.sun.mail..sun.mail.
    4. *un.mail.
    5. displays all classes in packages with the prefix com.sun.mail.
    6. com.sun.mail..sun.mail.

    *un.mail (also matches com.sun.mail itself).147 classifications were found, ranging from ″ACL″ to ″YoungerTerm.″ Sun Mail Ascii Package: com.sun Mail Ascii Package Name: *un.mail.ascii This package contains all classes in packages that begin with the prefix ″com.sun.″ and whose class name begins with the letter ″ascii.″ As a result, there is just one class (″ASCIIUtility″) com.sun.mail.ascii..sun.mail.ascii.*un.mail.ascii.com.sun.mail.ascii..sun.mail.ascii.There were no results (there is no package ″com.sun.mail.ascii″) You may just choose any of the matches, and the package explorer will expand to include the package if the ″Link with Editor″ option is enabled in ″Package Explorer″ view.You may access to the root package by pressing (Ctrl+F7) after selecting the package explorer (for example, by pressing Ctrl+F7).

    Rename refactorings

    1. Use the Rename refactoring to rename symbols, files, directories, packages, modules, and any other references to them that appear throughout the code.
    2. Because only the limited scope is impacted, renaming local variables or private methods may be accomplished quickly and easily inline.
    3. Renaming classes or public methods has the potential to have a large influence on a large number of files.
    4. Before you refactor, have a look at the prospective modifications.

    Rename code in place

    1. Using the editor, begin by renaming one or more parameters, a method, or another piece of code. If you want to apply a recommendation, IntelliJ IDEA will show in the gutter
    2. click the gutter icon or press Alt+Enter to bring up a list of suggestions. IntelliJ IDEA renames the code element and changes the code element’s usages to reflect the new name.

    Rename a directory or a module

    1. Right-click a directory or a module in the Projects tool window that you wish to rename
    2. then select Rename from the context menu.
    3. To bring up the context menu, press (Shift+F6).
    4. Select what you wish to rename from the drop-down menu that appears. It is possible to rename two modules at the same time if they both have a single content root and have the same name as your module.
    5. Fill out the Rename dialog box that appears by typing in the new name and then clicking OK.

    Rename a package

    1. In the Project tool window, pick Project from the drop-down menu and then Packages from the list. IntelliJ IDEA displays a list of all the packages contained within your project.
    2. To rename a package, right-click it and pick (Shift+F6) from the context menu that appears on the right. IntelliJ IDEA will display a warning if you have numerous directories that correspond to the package, or if the package has directories in the libraries that cannot be changed. You can, however, choose to proceed with one of the alternatives presented in the warning. IntelliJ IDEA presents the Rename dialog box, where you may input the new package name and then click Preview to check which folders and files will be impacted before deciding whether or not to restructure your code. If you wish to reverse the changes you’ve made, hit the Ctrl+Z keyboard shortcut.

    Rename a code element

    1. Select the element you wish to rename from the editor’s drop-down menu. You may rename a file by selecting it in the Project tool window and pressing Shift+F6 or by selecting it from the main menu. As soon as you use the Shift+F6 shortcut, IntelliJ IDEA shows andnext to the highlighted element. You may use the Tab key to bring up the context menu, from which you can choose the extra renaming alternatives. You may open the Rename dialog by using the Shift+F6 key combination. If you wish to view the Rename dialog with more choices, click the More options link or press Shift+F6
    2. Open (Shift+F6) the Rename dialog. To enable the Preview and Refactor buttons, change the element’s name to something more descriptive. You have the option of specifying more parameters. If you want to search for element occurrences, you may specify where to look or what else to rename. You may also choose the scope of the refactoring
    3. click Preview to obtain a preview of the potential changes, or click Refactor to start the refactoring process. As soon as you click Preview, IntelliJ IDEA shows the Find tool window, which displays the results of the searches and allows you to approve the refactoring (Do Refactor).
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    When you use the Rename refactoring again, IntelliJ IDEA remembers the choices you selected in the Rename dialog box the previous time you used it.

    Examples

    Let’s rename a class MyClass to something more descriptive.

    Before After
    public class MyClass { // some code here } public void myMethod() { MyClass myClass = new MyClass(); } public class YourClass { // some code here } public void myMethod() { YourClass yourClass = new YourClass(); }

    Let’s rename a class MyClass to something more appropriate for the situation:

    Java Package – javatpoint

    1. A Java package is a collection of classes, interfaces, and sub-packages that are similar in nature.
    2. The built-in package and the user-defined package are the two types of packages that may be found in Java.
    3. In addition to the standard Java and Lang packages, there are many more built-in packages such as Awt and javax.
    4. There are also several built-in packages such as net, io, util and sql.
    5. Here, we will go through the specifics of building and utilizing user-defined packages in greater depth.

    Advantage of Java Package

    1) The Java package is used to classify the classes and interfaces in order to make them easier to manage in the future. 2) The Java package protects against unauthorized access. 3) The Java package eliminates name conflicts.

    Simple example of java package

    In Java, the package keyword is used to build a package that contains other packages.

    How to compile java package

    1. When working without an integrated development environment, you must use the syntax listed below.
    2. To give an example, the -d option indicates the location where the created class file should be saved.
    3. /home (in the case of Linux), d:/abc (in the case of Windows), and so on are examples of acceptable directory names.
    4. You can use if you wish to keep the package in the same directory as the other files (dot).

    How to run java package program

    You must use a fully qualified name, for example, mypack. To execute the class, it’s as simple as that.

    To Compile: javac -d. Simple.java
    To Run: java mypack.Simple

    Welcome to the package, says the output. The -d option instructs the compiler where to place the class file, i.e., it denotes the destination of the class file. The letter symbolizes the folder that is currently open.

    How to access package from another package?

    It is possible to access the package from outside of the package in three ways:

    1. Fully qualified name
    2. import package.*
    3. import package.classname
    4. import package.classname

    1) Using packagename.*

    All classes and interfaces in this package will be accessible if you use package.*, but subpackages will not be accessible if you use package. In order to make the classes and interfaces of another package accessible to the present package, the import keyword must be specified.

    Example of package that import the packagename.*

    2) Using packagename.classname

    When you import package.classname, only the classes that have been defined in this package will be available.

    Example of package by import package.classname

    3) Using fully qualified name

    1. If you use a fully qualified name, only the classes that have been defined in this package will be available.
    2. There is no longer any need to import.
    3. When accessing a class or interface, you must, however, use the fully qualified name each and every time you do so.
    4. It is commonly used when two packages include the same class name, for example, when the java.util and java.sql packages both contain the Date class.

    Example of package by import fully qualified name

    Note: If you import a package, subpackages will not be imported.

    Whenever you import a package, all of the classes and interfaces contained inside that package will be imported, with the exception of the classes and interfaces contained within the subpackages. As a result, you’ll need to include the subpackage as well.

    Note: Sequence of the program must be package then import then class.

    Subpackage in java

    1. The subpackage is a package that is contained within another package.
    2. It should be constructed in order to further classify the package.
    3. Consider the following example: Sun Microsystems has created a package entitled java that contains several classes such as System, String, Reader, Writer, Socket, and so on and so forth.
    4. They represent a certain category of operations, for example, Reader and Writer classes represent input/output operations, Socket and ServerSocket classes represent networking operations and so forth.
    5. Consequently, Sun has divided the Java package into subpackages such as lang, net, and io, and placed the Input/Output related classes in the io package, Server and ServerSocket classes in the net package, and so on.
    6. Sun has also divided the java package into subpackages such as lang, net, and io.

    The standard of defining package is domain.company.package e.g. com.javatpoint.bean or org.sssit.dao.

    Example of Subpackage

    To Compile: javac -d. Simple.java
    To Run: java com.javatpoint.core.Simple

    How to send the class file to another directory or drive?

    In one case, I’d want to place the class file for the A.java source file in the classes folder on the c: disk’s hard drive. As an illustration:

    To Compile:

    C:classes Simple.java E:sources> javac -d c:sources Simple.java

    To Run:

    To run this program from e:\source directory, you need to set classpath of the directory where the class file resides.
    e:\sources> set classpath=c:\classes;.;
    e:\sources> java mypack.Simple

    Another way to run this program by -classpath switch of java:

    1. The -classpath switch can be used with both the javac and the java tool, respectively.
    2. To execute this program from the e:source directory, you may use the -classpath flag of the Java programming language, which instructs Java where to look for the class file.
    3. To give an example, e:sources>java -classpath c:classes mypack.
    4. Output in a straightforward manner: Greetings and welcome to the bundle

    Ways to load the class files or jar files

    • It is possible to import class files in two different ways: temporarily and permanently. Temporary In the command prompt, you may specify the classpath to use.
    • By using the -classpath switch
    • Permanent By include the classpath in the environment variables, we may get the following results:
    • This may be accomplished by producing a jar file that contains all of the class files and placing the jar file in the jre/lib/ext directory.

    Rule: There can be only one public class in a java source file and it must be saved by the public class name.

    How to put two public classes in a package?

    To include two public classes in a package, create two java source files, each containing a single public class, but keep the package name the same in both files. As an illustration:

    What is static import feature of Java5?

    Is it possible to change the package name of an Android app on Google Play?

    • Guide in its entirety: It is possible to state that the following is true based on Android official blogs: If a modification has been made to a manifest package’s name, a new program will be installed alongside an existing application, allowing both to co-exist on the user’s device at the same time
    • If the signing certificate for an application changes, attempting to install the new program on the device will fail until the old version is removed
    • otherwise, the new application will be installed successfully.
    • According to the Google App Update check list: Make sure your applications are up to date. Make a copy of your APK. Remember to update your app’s version code as well when you’re ready to make modifications to your APK so that current users will be notified of the changes. Check the following items off your list to ensure that your updated APK is ready to be deployed to your current users: If the package name of the new APK is different from the current version, the update will not be accepted.
    • The version code must be higher than the current version code in order to be valid. Learn more about the benefits of versioning your software programs.
    • The new APK must be signed with the same signature as the current version
    • otherwise, the update will fail.
    1. Utilizing the following command on both APKs, you can see if your new APK is using the same certification as the previous version, and if it is, you can do a comparison between them: $ jarsigner -verify -verbose -certs my application.apk -certs my application.apk If the results are the same, you know you’re utilizing the same key and are ready to move on to the next step.
    2. You will need to re-sign the APK with the right key if your findings are different from the first time.
    3. Learn more about the importance of signing your applications.
    4. Please upload your APK.
    5. Once your APK is complete, you may proceed to the creation of a new release.

    Prerequisites

    • Installing or updating Android Studio to the most recent version is required.
    • Make certain that your project satisfies the following requirements: This application targets API level 19 or above (KitKat).
    • Android 4.4 or above is required.
    • It makes use of Jetpack (AndroidX), which requires that it match the following version requirements: com.android.tools.build:gradle v3.2.1 or later
    • compileSdkVersion 28 or later
    • com.android.tools.build:gradle v3.2.1 or later
    • Set up a hardware device or run your program on an emulator to test it out. Keep in mind that Firebase SDKs that rely on Google Play services require the device or emulator to have Google Play services installed in order to function properly.
    • Firebase may be accessed with your Google account.
    • We offer a number of quickstart examples available for download if you do not currently have an Android project and would want to check out a Firebase product. If you want to connect your Android app to Firebase, you may do it in one of the ways listed below: Utilize the Firebase console setup method, which is recommended as an option 1.
    • The Android Studio Firebase Assistant (which may need additional setting) is an alternative.

    Option 1: Add Firebase using the Firebase console

    Adding Firebase to your app necessitates the completion of activities in both the Firebase interface and the open Android project (for example, you download Firebase config files from the console, then move them into your Android project).

    Step 1: Create a Firebase project

    Before you can integrate Firebase into your Android application, you must first establish a Firebase project that will communicate with your Android application. If you want to learn more about Firebase projects, go visit Understand Firebase Projects. Create a Firebase project to store your data.

    1. In the Firebase console, select Add project from the drop-down menu. Add Firebase resources to an existing Google Cloud project by typing the project name into the text box or selecting it from the dropdown menu.
    2. To start a new project, type the name of the project you want to work on. Additionally, you may alter the project ID that appears underneath the project name if you so want.
    1. If asked, read and agree to the Firebase terms of service.
    2. Continue by clicking on the Continue button.
    3. (Optional) Create a Google Analytics account for your project, which will allow you to have the best possible experience while utilizing any of the Firebase products listed below: You have the option of using an existing Google Analytics account or creating a new one. If you establish a new account, choose your Analytics reporting location, and then accept the data sharing settings and Google Analytics terms for your project, you will be able to track and analyze your results.
    4. In the Projects section, choose Create project (or Add Firebase if you’re using an existing Google Cloud project).

    Firebase automatically creates resources for your Firebase project when it is launched. As soon as the procedure is complete, you will be sent to the overview page for your Firebase project within the Firebase interface.

    Step 2: Register your app with Firebase

    For your Android app to be able to use Firebase, you must first register your app with your Firebase project. The process of registering your app is sometimes referred to as ″adding″ your app to your project.

    1. Go to the Firebase console and enter your credentials.
    2. To begin the setup phase, locate the Android icon () or Add app in the center of the project overview page and click it.
    3. In the Android package name field, provide the name of your application’s package. What is the name of the package, and where can you locate it? A package name is a unique identifier for your program on the device as well as in the Google Play Store.
    4. A package name is sometimes referred to as an application ID in some circles.
    5. Locate the package name for your app in your module (app-level) Gradle file, which is often app/build.gradle (for example, com.yourcompany.yourproject)
    6. It’s important to note that the package name value is case-sensitive and that it cannot be modified for this Firebase Android app once it has been registered with your Firebase project.
    • (Optional) Fill out the rest of the app information: App moniker and Debug signing certificate using SHA-1 hashing algorithm What is the relationship between the App moniker and the Debug signing certificate SHA-1 in Firebase? Nickname for the application: a temporary, internal identification that is only accessible to you while you are logged into the Firebase console
    • Debug signing certificate with SHA-1 hashing algorithm: In order for Firebase Authentication (when using Google Sign In or phone number sign in) and Firebase Dynamic Links to work, a SHA-1 hash must be used.
    1. Click Register app.

    Step 3: Add a Firebase configuration file

    1. Add the Firebase Android configuration file to your app:
    1. To acquire your Firebase Android configuration file (google-services.json), choose Download google-services.json from the menu bar.
    2. Place your configuration file in the module (app-level) directory of your application.
    • What information do you require about this configuration file? The Firebase configuration file provides IDs that are unique but not secret for your project. For additional information on this configuration file, see Understand Firebase Projects (in English).
    • You have the option to download your Firebase configuration file again at any point in time.
    • Make certain that the configuration file name does not contain any more characters, such as (2)

    Add the google-services plugin to your Gradle files in order to make Firebase products available in your project.

    1. Include the Google Services Gradle plugin in your root-level (project-level) Gradle file (build.gradle) by adding rules to the build.gradle file. Check to see if you have Google’s Maven repository installed, too. buildscript repositories / Verify that you have the following line (if not, add it): google()/ Google’s Maven repository dependencies / Verify that you have the following line (if not, add it): /. /. /. /. /. /. /. /. /. The following line to be added: classpath ‘com.google.gms:google-services:4.3.10’/ Google Services plugin com.google.gms:google-services:4.3.10’ everything /. repositories / Make sure you have the following line (if not, add it): google()/ The Google Maven repository /. allprojects
    2. In your module (app-level) Gradle file (often app/build.gradle), include the following code: Google Services Gradle Plugin ‘com.android.application’ is the plugin to use / The following line should be added: android ‘com.google.gms.google-services’ plugin / Google Services plugin /.

    Step 4: Add Firebase SDKs to your app

    Declare the dependencies for the Firebase products that you intend to utilize in your app using the Firebase Android Business Object Model. Declare them in the module (app-level) Gradle file (often app/build.gradle) where they will be used.

    Analytics enabled

    Java

    1. Dependencies / Import the Firebase BoM implementation platform(‘com.google.firebase:firebase-bom:29.2.0’) from the Firebase BoM documentation.
    2. / In the case of the BoM, you do not need to declare versions in the Firebase library dependency lists.
    3. / The dependence on the Google Firebase SDK for Google Analytics implementation is declared as ‘com.google.firebase:firebase-analytics;’ / Declare the dependencies for any additional Firebase products that you wish to use / If you need Firebase Authentication and Cloud Firestore, you can declare the dependencies for them using the following syntax: implementation ‘com.google.firebase:firebase-auth’, implementation ‘com.google.firebase:firebase-firestore’, and implementation ‘com.google.firebase:firebase-auth’, implementation ‘com.google.firebase:firebase-firestore’

    Kotlin+KTX

    1. Dependencies / Import the Firebase BoM implementation platform(‘com.google.firebase:firebase-bom:29.2.0’) from the Firebase BoM documentation.
    2. / In the case of the BoM, you do not need to declare versions in the Firebase library dependency lists.
    3. In this case, the Firebase SDK for Google Analytics implementation ‘com.google.firebase:firebase-analytics-ktx’ is declared as a dependency.
    4. Declare the dependencies for any additional Firebase products that you wish to use / For example, declare the dependencies for Firebase Authentication and Cloud Firestore implementation ‘com.google.firebase:firebase-auth-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google With the Firebase Android Business Object Model (BOM), your app will always use the most up-to-date versions of the Firebase Android libraries.

    Analytics not enabled

    Java

    1. Dependencies / Import the Firebase BoM implementation platform(‘com.google.firebase:firebase-bom:29.2.0’) from the Firebase BoM documentation.
    2. / In the case of the BoM, you do not need to declare versions in the Firebase library dependency lists.
    3. / Declare the dependencies for the Firebase products that you want to use / If you need Firebase Authentication and Cloud Firestore, you can declare the dependencies for them using the following syntax: implementation ‘com.google.firebase:firebase-auth’, implementation ‘com.google.firebase:firebase-firestore’, and implementation ‘com.google.firebase:firebase-auth’, implementation ‘com.google.firebase:firebase-firestore’

    Kotlin+KTX

    • Dependencies / Import the Firebase BoM implementation platform(‘com.google.firebase:firebase-bom:29.2.0’) from the Firebase BoM documentation. / In the case of the BoM, you do not need to declare versions in the Firebase library dependency lists. / Declare the dependencies for the Firebase products that you want to use / For example, declare the dependencies for Firebase Authentication and Cloud Firestore implementation ‘com.google.firebase:firebase-auth-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google.firebase:firebase-firestore-ktx’ implementation ‘com.google By utilizing the Firebase Android Business Object Model, your app will always use the most up-to-date versions of the Firebase Android libraries.
    • When you sync your app, you can be guaranteed that all of its dependencies have the latest versions. You’re getting a build failure while trying to call custom support or enable desugaring. Here’s how to get things fixed. Gradle builds that use the Android Gradle plugin (AGP) v4.2 or earlier must be configured to provide Java 8 compatibility. Unless this is done, these Android projects will fail to develop when the Firebase SDK is added. If you encounter a build failure, you have two alternatives for resolving the problem: The compileOptions from the error message should be added to your app’s build.gradle file.
    • Raise the minimum SDK version for your Android project to 26 or higher.

    More information about this build failure may be found in this FAQ.

    That’s all there is to it! You can proceed to the next section to see the recommended next steps. If you’re experiencing difficulties getting your Android device set up, check out the Android troubleshooting & FAQ page.

    Option 2: Add Firebase using the Firebase Assistant

    It registers your app with a Firebase project and adds all of the essential Firebase files, plugins, and dependencies to your Android project – all from the comfort of your own Android Studio workspace.

    1. Start by opening your Android project in Android Studio, and then double-check that you’re working with the most recent versions of both Android Studio and the Firebase Assistant. Windows and Linux users may check for updates by selecting Help > Check for updates.
    2. Mac: Android Studio > Check for updates
    3. Windows: Android Studio > Check for updates
    1. Open the Firebase Assistant by selecting Tools > Firebase from the menu bar.
    2. Select a Firebase product from the Assistant pane to include it in your app’s functionality. If it has an instructional link, expand that part (for example, Analytics > Log an Analytics event)
    1. To link your Android project with Firebase, select Connect to Firebase from the drop-down menu. What exactly does this process accomplish? This procedure builds a new Firebase Android app based on the package name of your existing Firebase Android app. You may develop this new Firebase Android app in either an existing Firebase project or a whole new Firebase project, depending on your preferences. Here are some pointers for getting your Firebase project up and running: To learn more about best practices and concerns for adding applications to a Firebase project, including how to handle numerous build versions, go to Understand Firebase Projects.
    2. In the event that you are starting a new project, we strongly advise that you set up Google Analytics for your project, which will allow you to have the best possible experience while working with numerous Firebase products.

    This workflow also includes the addition of the Android configuration file for your Firebase project (google-services.json) to the module (app-level) directory of your application.

    To add a desired Firebase product, simply click on the button (for example, Add Analytics to your app).

    1. Check that all dependencies have the latest versions by synchronizing your app with the server.
    2. Maintain your selected Firebase product’s configuration by following the remaining setup steps in the Assistant pane.
    3. Using the Firebase Assistant, you can integrate as many additional Firebase products as you like.

    Check that all dependencies have the appropriate versions by synchronizing your app with them.
    To finish setting up your Firebase product, go to the Assistant window and follow the final steps.
    The Firebase Assistant allows you to add as many additional Firebase products as you like.

    Available libraries

    • This section shows the Firebase products that are supported for Android, as well as the Gradle dependencies that are required. Learn more about these Firebase Android libraries by visiting their respective websites: (Java | Kotlin+KTX) Detailed reference docs
    • GitHub repository for the Firebase Android SDK

    Note that when utilizing the Firebase Android BoM, you do not need to specify specific library versions when declaring Firebase library dependencies in build.gradle since the Firebase Android BoM handles it for you.

    Next steps

    • Add the following Firebase services to your application: With Analytics, you may gain insight into user activity.
    • With the help of Authentication, create a user authentication flow.
    • Cloud Firestore or Realtime Database can be used to store data, such as user information.
    • Cloud Storage is a convenient way to store things such as images and movies.
    • With Cloud Functions, you may trigger backend code that runs in a secure environment.
    • Cloud Messaging may be used to send notifications.
    • With Crashlytics, you can find out when and why your app is crashing.
    • Find out more about Firebase: For further information about Firebase projects, as well as best practices for projects, go to Understand Firebase Projects.
    • Visit If you have concerns regarding topics that are unknown to you or that are special to Firebase and Android programming, you should learn more about Android and Firebase.
    • Examine some examples of Firebase applications.
    • Take part in the Firebase Android Codelab to gain hands-on experience.
    • In a weekend session, you may learn more about the Firebase.
    • Prepare for the launch of your application by doing the following: The Google Cloud Console allows you to set up budget alerts for your project.
    • Examine the Firebase console’s Usage and billing dashboard to obtain a comprehensive view of how much your project is using various Firebase services.
    • Review the Firebase launch checklist to ensure that everything goes smoothly.

    Having issues with Firebase and your Android project? Contact us today. Visit the Android troubleshooting & FAQ page for further information.

    Android: ADB – List Installed Package Names

    1. The goal is to list all of the packages that have been installed on an Android phone using the ADB shell.
    2. Using the ADB shell, the pm command may be used to manage Android package configurations.
    3. The following syntax should be used to display a list of all the packages that have been installed on an Android device.
    4. Adb shell pm list packages is executed with the command.
    5. Use the ″-s″ option to display just the packages that are part of the system.
    6. $ adb shell pm list packages -s $ adb shell pm list packages -s Use the ″-3″ option to display only third-party (or non-system) packages in the list.

    adb shell pm list packages -3 $ adb shell pm list packages -3 The ″-f″ option can be used to display a list of the package names as well as the path to the APK files that have been installed.Adb shell pm list packages -f is executed.The ″-f″ option can be used in conjunction with any of the other parameters.For example, the ″-f -s″ option can be used to display a list of system package names together with the location of the installed package.$ adb shell pm list packages -f -s $ adb shell pm list packages The ″-d″ option can be used to display a list of all the disabled package names.$ adb shell pm list packages -d $ adb shell pm list packages The ″-e″ option can be used to display a list of all of the enabled package names.

    • # $ adb shell pm list packages -e ibrahim = interested in(unix, linux, android, open source, reverse engineering); coding(c, shell, php, python, java, javascript, nodejs, react); plays on (xbox, ps4); linux desktop user(true); $ adb shell pm list packages -e ibrahim

    Eclipse Cookbook

    1. You want to rename a variable, function, or other item in code, and you want to make sure that you capture every instance of the element that is being referenced by the renaming operation.
    2. Pick the element in the JDT editor and then select Refactor Rename from the context menu, or right-click the element and select Refactor Rename from the context menu of the editor.
    3. After that, just type in the new name you wish to give the object, and you’re done.
    4. Consider the following scenario: you have the code shown in Example 4-1 and you feel that the name of the variable in the main method, message, is too short.
    5. You may change the name of the variable in the main method.
    6. Instead, you would want it to be labeled message.

    Example 4-1: A straightforward main method The package org.cookbook.ch04 contains the public class Messenger.main is a public static void function (String args) msg = ″No problem.″; System.out.println(msg); msg = ″No problem.″ The following is an example of a public static void printem(String msg): System.out.println(msg); To rename all instances of this msg variable, either right-click the variable and select Refactor Rename, or highlight the variable and select Refactor Rename, which will open the dialog shown in Figure 4-1.To rename only one instance of this msg variable, select the variable and select Refactor Rename.Figure 4-1: Changing the name of a local variable As illustrated in Figure 4-2, you can change the name of msg to message by typing in the word ″message″ in the dialog box and clicking Preview.This opens a preview of the changes that have been made.Figure 4-2.

    • Changes to refactoring are shown in advance.
    • When you rename a variable, Eclipse is clever enough to simply alter references to that variable, not the unrelated variable of the same name in the printem function.
    • The code in Example 4-1 is changed as a result of clicking the OK button, and it now displays as follows: The package org.cookbook.ch04 contains the public class Messenger.
    • main is a public static void function (String args) system.out.println(message); var message = ″No problem.″; public static void printem(String msg) System.out.println(msg); var message = ″No problem.″; System.out.println(message).
    1. It’s just as simple to change the name of a method.
    2. For example, right-click the principal method and then pick Refactor Rename, or right-click the variable and then select Refactor Rename from the context menu.
    3. This opens the Rename Method dialog box, as shown in Figure 4-3, in which we’re renaming the method that will be displayed on the screen.
    4. By selecting OK, the method and all references to it are renamed.
    5. Figure 4-3.
    6. Changing the name of a method In addition to renaming local variables and methods, the Eclipse Refactor menu allows you to rename projects, resources, source folders, packages, compilation units, types (such as classes), fields, methods, and parameters in addition to renaming local variables and methods.

    Remember that refactoring is done automatically across several files, which is convenient.

    Tip

    1. Use the ″local rename″ Quick Assist to rapidly do a renaming that does not necessitate a thorough examination of the relationships between other files.
    2. Press Ctrl-1 (or select Edit Quick Fix) while in the JDT editor to quickly fix a variable, method, or type that has been highlighted.
    3. By marking the relevant checkboxes, as shown in Figure 4-4, you may change references to elements you rena

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