Simulating multiple inheritance in Java.

NestedClassesExample.java

public class NestedClassesExample {

	public static void main(String args[]) {
		Child child = new Child();
		child.print();
	}


	public static class ParentA {
		public void printA() {
			System.out.println("parent a");
		}
	}

	public static class ParentB {
		public void printB() {
			System.out.println("parent b");
		}
	}

	public static class ParentC {
		public void printC() {
			System.out.println("parent c");
		}
	}

	public static class Child {
		private final MixA.MixB.MixC mixABC = new MixA().mixB.mixC;

		public void print() {
			mixABC._print();
		}

		private class MixA extends ParentA {
			private final MixB mixB = new MixB();

			private class MixB extends ParentB {
				private final MixC mixC = new MixC();

				private class MixC extends ParentC {
					private void _print() {
						printA();
						printB();
						printC();
					}
				}
			}
		}
	}

	// Think of it as a super-delegate. You can always support multiple inheritance with delegates,
	// but this gives you the option to create one class with access to all parents simultaneously.
}