Use Java assertions to test your assumptions about program correctness and check them in your code.

Java has the Boolean type, so you actually have the keywords 'true' and 'false' in your code. C, for example, doesn't so it doesn't evaluate to 0. C doesn't have the Boolean type, it's just an int.

Most new Java developers quickly learn that they should generally compare Java Strings using String.equals(Object) rather than using == . This is emphasized and reinforced to new developers ...

How the true and false commands work, and how to put them to use on the command line and in scripts.