Often you may want to test a single piece of code. For example, say you forget how the % operator works with negative numbers, or you must determine how a certain API call operates. Writing, compiling ...

When I first learned to program, it was grasping if statements that helped it all click into place for me. Once you can use if statements, you can build all kinds of useful and interesting tools.

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In a previous Java 101 tutorial, you learned how to better organize your code by declaring reference types (also known as classes and interfaces) as members of other reference types and blocks. I also ...