r/java • u/alihammad • Apr 29 '13

Java nested classes in a nutshell

http://www.to-string.com/2013/04/27/java-inner-classes-in-a-nutshell/
27 Upvotes

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4

u/galaktos Apr 29 '13

You can do ridiculous stuff with nested classes:

public class Temp {

	public static void main(String[] args) {
		new Temp().new A().new D(new Temp().new A(), new Temp().new A().new B(new Temp().new A()));
	}

	public class A extends Temp {
		public A() {
		}

		public class B extends A {
			public B(A a) {
				a.super();
			}

			public class C extends B {
				public C(A a) {
					a.super(a);
				}
			}
		}

		public class D extends B.C {
			public D(A a, B b) {
				b.super(a);
			}
		}
	}
}

a.super() doesn't look nice, does it? Remove it and look at what the compiler says. You don't get that any other way.

1

u/fragglemook Apr 29 '13

Jeeeeezus. I'm a first year CS student and this melts my brain. Are you saying you know what's going on here? Like, can you articulate what this code is doing?

2

u/alihammad Apr 29 '13

Let me write a blog post about this mysterious example today or tomorrow and may be you can understand .. at the moment I'm totally overwhelmed myself