anonymous-class – Page 4

How are Anonymous inner classes used in Java?

September 28, 2022 by Tarik

By an “anonymous class”, I take it you mean anonymous inner class. An anonymous inner class can come useful when making an instance of an object with certain “extras” such as overriding methods, without having to actually subclass a class. I tend to use it as a shortcut for attaching an event listener: button.addActionListener(new ActionListener() … Read more

Why are only final variables accessible in anonymous class?

September 23, 2022 by Tarik

As noted in comments, some of this becomes irrelevant in Java 8, where final can be implicit. Only an effectively final variable can be used in an anonymous inner class or lambda expression though. It’s basically due to the way Java manages closures. When you create an instance of an anonymous inner class, any variables … Read more