JUnit is a unit testing framework for the Java programming language. A unit test is a piece of code written by a developer that executes a specific functionality in the code to be tested. A unit test targets a small unit of code, e.g., a method or a class, and they ensure that code works as intended. JUnit has been important in the development of test-driven style of programming.
Javadoc is a documentation generator for generating API documentation in HTML format from Java source code. The HTML format is used to add the convenience of being able to hyperlink related documents together. The "doc comments" format used by Javadoc is the de facto industry standard for documenting Java classes.
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