JD-Eclipse is a Java decompiler plugin for Eclipse that enables you to decompile Java classes, allowing you to view and understand the source code of Java classes, even if the original source code is not available. It uses the JD (Java Decompiler) library, which is a standalone Java application that can decompile Java classes.
Suppose you want to understand the implementation of a Java library, but you don't have the source code. You can use JD-Eclipse to decompile the library's bytecode into source code. jd-eclipse