Java | Class and Object | Question 5

Predict the output of the following program.

class First
{

    void display()
    {
        System.out.println("Inside First");
    }
}

class Second extends First
{

    void display()
    {
        System.out.println("Inside Second");
    }
}


class Test
{

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

        First ref;
        ref = obj1;
        ref.display();

        ref = obj2;
        ref.display();
    }
}

(A) Compilation error
(B)

Inside First
Inside Second

(C)

Inside First
Inside First

(D) Runtime error

Answer: (B)
Explanation: ‘ref’ is a reference variable which obtains the reference of object of class First and calls its function display().
Then ‘ref’ refers to object of class Second and calls its function display().

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