What is happening in the program?

Question

Hi friends,
i was going through this program, and i could not understand why its not printing anything.
class A {
     String str1 = "";
     String str2 = "";
     String getA() {
          return str1;
     void setA(String s) {
          str1 = s;
     String getB() {
          return str2;
     void setB(String s1) {
          str2 = s1;
class B extends A{
public class N {
     public static void main(String a[]) {
          A aobj = new A();
          A aobj1 = new B();
          aobj.setA("Sun");
                aobj.setB("Java");
          aobj1.getA();
          System.out.println(aobj1.getA());
}

Answer 1

I think you may have a typo.
You are calling setter methods on aobj:
  aobj.setA("Sun");
  aobj.setB("Java");And then calling a getter method on aobj1:
System.out.println(aobj1.getA());aobj and aobj1 are different objects. You never call a setter method for aobj1, so its member attributes are still initialised to empty strings...
Cheers, Neil