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Java | Class and Object | Question 5

  • Difficulty Level : Medium
  • Last Updated : 28 Jun, 2021

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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