called super class method using child class instance

[siva koti]

Hi All,

Below one is the example code

class A{
  void display(){
    s.o.p("I am in A:display()")
  }
}

class B{
  void display(){
    s.o.p("I am in B:display()")
  }
}

class Test{
  p.s.v.m(String[] args){
    A a = new B();
    a.display();
    // the above method call disply() of class B.
    // But , how to call display() of class A without doing any code changes except on instance 'a'
    // and we should not create new instance for class A.
  }
}

Please give me solution for this problem?

[siva koti]

Thanks ranch team . Hereafter i will use code tag for jave code.