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What is the output of following program? abstract class Sum { public abstract int sumOfTwo(int n1, int n2); public abstract int sumOfThree(int n1, int n2, int n3); public void disp( ){ System.out.println("Method of class Sum"); } } class DemoAbstract1 extends Sum { public int sumOfTwo(int num1, int num2) { return num1+num2; } public int sumOfThree(int num1, int num2, int num3) { return num1+num2+num3; } public static void main(String args[ ]){ Sum obj = new DemoAbstract1( ); System.out.println(obj.sumOfTwo(3, 7)); System.out.println(obj.sumOfThree(4, 3, 19)); obj.disp( ); } }

What is the output of following program? abstract class Sum { public abstract int sumOfTwo(int n1, int n2); public abstract int sumOfThree(int n1, int n2, int n3); public void disp( ){ System.out.println("Method of class Sum"); } } class DemoAbstract1 extends Sum { public int sumOfTwo(int num1, int num2) { return num1+num2; } public int sumOfThree(int num1, int num2, int num3) { return num1+num2+num3; } public static void main(String args[ ]){ Sum obj = new DemoAbstract1( ); System.out.println(obj.sumOfTwo(3, 7)); System.out.println(obj.sumOfThree(4, 3, 19)); obj.disp( ); } } Correct Answer <p>10</p> <p>26</p> <p>Method of class Sum</p> 

abstract class Sum
{
  public abstract int sumOfTwo(int n1, int n2);
  public abstract int sumOfThree(int n1, int n2, int n3);
  public void disp( ){
    System.out.println("Method of class Sum"); // output Method of class Sum (3)
  }
}
class DemoAbstract1 extends Sum
{
  public int sumOfTwo(int num1, int num2)
  {
    return num1+num2;  //output 10 (1)
  }
  public int sumOfThree(int num1, int num2, int num3)
  {
    return num1+num2+num3; // output 26 (2)
  }
  public static void main(String args){
    Sum obj = new DemoAbstract1( );
    System.out.println(obj.sumOfTwo(3, 7));
    System.out.println(obj.sumOfThree(4, 3, 19));
    obj.disp( );
  }
}

Output of the following program is 

10

26

Method of class Sum

A method that is declared as abstract and does not have implementation is known as abstract method.

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