How can we debug method calls that are not part of our own source code, say a call to JButton.setEnabled()? Java provides us with anonymous inner classes, which come in quite handy for this problem.

The approach used in Java 8 isn’t just limited to Java itself though. Scala has historically implemented its lambda expressions by generating anonymous inner classes.

If you’ve read my Java 101 tutorial introducing static classes and inner classes, you should be familiar with the basics of working with nested classes in Java code. In this Java tip, you’ll learn ...