How to compile .class files

java eclipse .class-file
Moon picture Moon · Jun 10, 2014 · Viewed 16.2k times · Source

I am new to Java, I have some *.class files which needs to be modified. Now I de-compiled these *.class files to get the source code using the famous JD Decompiler. The concern is after I change the code and need to recompile these *.class files how will I do it with Eclipse. I only the compiled *.class files.

I know its a stupid question but bear with me I'm .NET Developer with a few days into Java.

Answer

Shail016 picture Shail016 · Jun 10, 2014

You can not compile a *.class file, Its already compiled code (bytecode) for its *.java source. I think you need to copy the code from JD Decompiler's editor to a java source file.

i.e. copy the source code from JD's editor for Hello.class into a file named Hello.java. Now you can move this file in IDE of your choice or directly compile using javac. (dont forget to put all the dependencies/required jars/source in project build path)

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