abstract

package javaapplication15;

 abstract class A
 {
    public A() {
        System.out.println("This is constructor of abstract class");
    }

   abstract void  a_method();

    public void non_method()
    {
        System.out.println("This is a normal method of abstract class");
    }
}

 class B extends A{

     @Override
     void a_method() {
         System.out.println("This is abstract method");
     }

     public static void main(String[] args) {
         A q = new B();
         q.a_method();
         q.non_method();
     }

 }