Java | Class and Object | Question 4

class demo
{
    int a, b;

    demo()
    {
        a = 10;
        b = 20;
    }

    public void print()
    {
        System.out.println ("a = " + a + " b = " + b + "\n");
    }
}

class Test
{

    public static void main(String[] args)
    {
        demo obj1 = new demo();
        demo obj2 = obj1;

        obj1.a += 1;
        obj1.b += 1;

        System.out.println ("values of obj1 : ");
        obj1.print();
        System.out.println ("values of obj2 : ");
        obj2.print();

    }
}

(A) Compile error
(B)

values of obj1: 
a = 11 b = 21
values of obj2: 
a = 11 b = 21

(C)

values of obj1: 
a = 11 b = 21
values of obj2: 
a = 10 b = 20

(D)

values of obj1: 
a = 11 b = 20
values of obj2: 
a = 10 b = 21

(E) Run time error


Answer: (B)

Explanation: Assignment of obj2 to obj1 makes obj2 a reference to obj1. Therefore, any change in obj1 will be reflected in obj2 also.

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