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Frequent question: How to edit java class file?

  1. Decompile the . class file as you have done and save it as .
  2. Create a project in Eclipse with that java file, the original JAR as library, and all its dependencies.
  3. Change the . java and compile.
  4. Get the modified . class file and put it again inside the original JAR.

How do you edit and recompile a jar file?

  1. add the jar as a dependency to that project.
  2. Create a new class named ScreenCapture.
  3. copy the whole source from your JD too view the screenshot of which u attached here.
  4. change the code which u want.
  5. build the project.
  6. check the bin folder of you eclipse project .
  7. open the jar in winrar and copy the .

Where can I edit Java code?

The IDE’s built-in Source Editor enables you to view, create, and edit your Java source code. Open the Source Editor window by double-clicking a node in the Projects window, Files window, or Navigator window. Alternatively, you can open the Source Editor by choosing File > New to create a new file.

How do I convert .class to .Java in Eclipse?

The decompiler preference settings section is found here “Window > Preferences > Java > Decompiler”. You can open the Eclipse perference dialog to set the preference for yourself. The most important setting is the “Default Class Decompiler”, you may change it frequently.

Can we edit jar file?

A jar file is a zip archive. You can extract it using 7zip (a great simple tool to open archives). You can also change its extension to zip and use whatever to unzip the file. Now you have your class file.

How do I edit a class file without decompiling?

  1. Decompile the . class file as you have done and save it as .
  2. Create a project in Eclipse with that java file, the original JAR as library, and all its dependencies.
  3. Change the . java and compile.
  4. Get the modified . class file and put it again inside the original JAR.

Can I use VS code for Java?

You can use VS Code to read, write, run, and debug Java source file(s) without creating a project. VS Code for Java supports two modes, lightweight and standard.

How do I browse Java code?

  1. In an IDE such as IntelliJ you can browse the source of these packages just like anything else. – Chris Martin Oct 19 ’14 at 7:24.
  2. Extending @ChrisMartin, right click the keyword (e.g. String ) in the editor -> “Go to” -> “Implementation(s)” as of idea 14.0.2 – ironicaldiction May 4 ’15 at 14:05.

How do I fix Java Lang ClassNotFoundException?

  1. Find out which JAR file contains the problematic Java class.
  2. Check whether this JAR is present in the application classpath.
  3. If that JAR is already present in the classpath, make sure the classpath is not overridden (e.g. by a start-up script).

Can we convert jar to Java?

jar file for which you want the sources on the JD. Java Decompiler will open with all the package structure in a tree format. Click on File menu and select save jar sources. It will save the sources as a zip with the same name as the jar.

What is the best java decompiler?

  1. 1) JD Project. JD Project is one of the most frequently used best java decompiler offline.
  2. 2) Cavaj Java Decompiler.
  3. 3) DJ Java Decompiler.
  4. 4) JBVD.
  5. 5) AndroChef Java Decompiler.
  6. 6) Procyon.
  7. 7) CFR Decompiler.
  8. 8) FernFlower.

Can we convert class file to Java file?

Disassemble a class file using javap command So there are many decompilers available which convert a . class file into a . java file.

How do I edit 7zip jar files?

Use 7zip, right click on jar and with 7z say open archive, then go to property file, double click and open file with notepad, edit it and save. Now when you will close 7z console, it will ask “update archive?” Say yes… That’s it.

Can we open jar file in eclipse?

To import a jar file in Eclipse IDE, follow the steps given below: … Click on libraries and then select Add External JAR. Select the desired jar file from the folder. One more dialogue box will open showing up the contents of the selected jar file.

How do I import and edit a jar file in eclipse?

  1. Right click on your project.
  2. Select Build Path.
  3. Click on Configure Build Path.
  4. Click on Libraries and select Add External JARs.
  5. Select the jar file from the required folder.
  6. Click and Apply and Ok.

Can we edit a class file?

You don’t generally edit . class files directly, you create them by running the javac compiler on a Java file. JAR files are just zipfiles though, you can easily extract the class files from them using any ZIP tool loo like 7zip, or the jar command line utility if you prefer.