如何将多个类文件转换为一个jar文件？

Question

I have decompiled a jar file,

and made two classes from it. After that, I tried to make a new jar file with these two class files, using this code

jar cvf AB.jar WinRegistry.class StartPageChangeApplet.class

The file created without any errors. However, when I look at the source code on Java Decompiler, it says "Internel Error", means that I couldn't make the jar file properly.

Where am I doing doing wrong ?

Answer 1

Please define "made two classes from it". Which java compiler (eg javac.exe) are you using? Did you just copy the source to a .class file without compiling maybe?

The java decompiler JAD actually displays source code, not class bytecode. Don't get confused by the title of the editor which is saying WinRegistry.class .

So you can't just save that as a .class . You need to save it as a .java and then compile it to .class using a java compiler:

javac WinRegistry.java StartPageChangeApplet.java
jar cf AB.jar WinRegistry.class StartPageChangeApplet.class

Answer 2

From Eclipse, you can do this way..