Java Abstract Class Instantiation and Overriding 101

Main.java

/**
 * Prints:
 * creating A
 * creating B
 * in B print
 */
public class Main {

	public abstract class A {
		public A() {
			System.out.println("creating A");
		}

		public void print() {
			System.out.println("in A");
		}
	}

	public class B extends A {
		public B() {
			System.out.println("creating B");
		}

		public void print() {
			System.out.println("in B print");
		}
	}

	public static void main(String[] args) {
		(new Main()).start();
	}

	public void start() {
                A b = new B();
                b.print();
	}
}