Question

what output is produced by the following code and explain how it works.

public class A {

int a = 1;

int b = 2;

public int getSum(int a, int b) {

    this.a+=a;

    this.b+=b;

    return this.a + this.b;

}

}

public class B extends A {

int a = 3;

int b = 4;

public int getSum(int a, int b) {

    this.b=a;

    super.b=b+b;

    return super.a+this.b;

}

}

public class q2 {

public static void main(String[] args){

A a = new A();

B b = new B();

System.out.println(a.a + " " + b.b);

System.out.println(a.getSum(a.a, b.b));  

System.out.println(a.b + " " + b.b);

System.out.println(b.getSum(a.b, b.b));

System.out.println(a.a+" "+a.b + " " +b.a+" "+b.b);

}

}

Answer 1

Output:

1 4
8
6 4
7
2 6 3 6

Here we have created 2 objects
a.a=1
a.b=2
b.a=3
b.b=4
we are printing a.a and b.b so it will be 1 4
next we are calling sum with 1,4
so it will 1 a.a so it will be 2 and 4 to a.b so it will be 6
so it will return 8
printing a.b and b.b so 6 4
again getSum will return 7
final values will be 2 6 3 6

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