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Java | Class and Object | Question 5
  • Difficulty Level : Medium
  • Last Updated : 11 Jan, 2016

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().


Quiz of this Question

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