In Java, we don’t need to write “THEN.” Instead, we use an open curly bracket to say that everything that follows is part of that “code block” and should run under the conditions we specify.

Exception in thread "main" java.lang.AssertionError: x < 0 at AssertDemo.main(AssertDemo.java:6) For either example, running AssertDemo without the -ea (enable assertions) option results in no output.

This post explains how to use loops in Java. Learn for loops, while loops, do while, break, ... except you can determine any condition using values you may have defined elsewhere in your code.