Class file details in Java A class file in Java has a . class extension. It contains bytecode, which is instruction for Java Virtual Machine, which translates that bytecode into platform-specific machine level instruction based upon whether the Java program runs on Windows or Linux .
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The language it produces is still bytecode (not anything like Java), but it’s fairly readable and extremely instructive. Also, if you really want to, you can open up any . class file in a hex editor and read the bytecode directly . The result is identical to using javap .9 Kas 2011
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