class B {
	public B() {
		System.out.println("called..");
	}
}

class A {
	B b;
	public static A ints = null;

	private A() {

	}

	public static A getA() {
		if (ints == null) {
			ints = new A();
		}

		return ints;
	}

	public B getB() {
		return b;
	}

	public void setB() {
		this.b = new B();
	}

}

public class Demo {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		A a1 = A.getA();
		A a2 = A.getA();
		a1.setB();
 		a2.setB();
		System.out.println(a1==a2);
		System.out.println(a1.getB() == a2.getB());

	}

}