What is the Java source filename extension, and what is the Java bytecode file- name extension?

The source file extension is .java and the bytecode file extension is .class.

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A Java source file is a text file containing code written in the Java programming language. This code defines classes, methods, and variables, and provides the implementation of the program's logic. The source file has a ".java" extension, and is typically compiled into Java bytecode, which is stored in a file with a ".class" extension. Java bytecode is the machine-readable representation of the source code that can be executed on a Java Virtual Machine.