IsaRelationship.java

class Parent{
  public void m1() {
    System.out.println("parent");
  }
}

class Child extends Parent{
  public void m2(){
    System.out.println("child");
   }
}

class Test{
  public static void main(String[] args) {
   Child c = new Child();
   c.m1();
   c.m2();
   }
}