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Several tools are standard in the industry for decompiling Java. They vary in capability, from simple viewers to advanced debuggers.

: Launch the application and drag your .class or .jar file into the interface.

Exceptional at handling modern Java features (Java 8 to 17+) and obfuscated code . CLI/Library Highly accurate for lambda expressions and annotations. Vineflower Open Source

Decompilation is not perfect. Since compilation is a lossy process (comments, formatting, and local variable names are discarded), the decompiled code is rarely identical to the original source. Variables are often renamed to generic names like var1 , var2 , etc.