How Can I Decompile Java Class Files?

Java Class File Decompilation

Java class files, containing compiled code, can be decompiled into readable Java source code to aid troubleshooting, performance analysis, or educational purposes.

Tools for Decompilation

JAD (Java Archive Decompiler)
JAD is a popular Java decompiler known for its speed. However, it only supports Java 1.3 and is no longer maintained.

JD-JSD (Java Decompiler)
JD-JSD is a command-line tool that can decompile Java 1.1.8 to 1.7.0 class files. It supports a wide range of compilers.

Java Decompiler
Java Decompiler provides explicit support for decompiling Java 5 class files. It has a user-friendly GUI and an online live demo version.

Output Format

The output of these decompilers is actual Java code, as the compiler's JVM assembly code is not generally available. By decompiling class files, developers can analyze the behavior of the code, identify optimization techniques, or simply regain access to the source code when it is unavailable.

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