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CLASS — Java Class File
A CLASS file is compiled Java bytecode: what the Java compiler makes from a .java source file, run by the Java Virtual Machine.
The Java compiler turns every class in a .java file into a .class file of bytecode, which the Java Virtual Machine runs on any system. Class files usually travel packed in JAR archives and start with the bytes CAFEBABE.
A class file cannot be read as text. Convert.Online decompiles it with Procyon back into Java source code, so you can see how a class works or recover lost code. Class names, methods and logic come back; comments are not stored in a class file, and local variable names are often missing too.