public class InnerClassTest {

	public void foo() {
		System.out.println("Outer class");
	}

	public class ReallyInner {
		public void foo() {
			System.out.println("Inner class");
		}

		public void test() {
			this.foo();
			InnerClassTest.this.foo();
		}
	}

	public static void main(String[] args) {
		InnerClassTest o = new InnerClassTest();
		InnerClassTest.ReallyInner i = o.new ReallyInner();
		i.test();
	}
}