Question

Help is greatly appreciated for the following: Give two ways the following code be corrected?

public class H2ClassC {

H2ClassC (int a) {}

}

// end class H2ClassC

class H2ClassD extends H2ClassC{

} // end class H2ClassD

Answer 1

public class H2ClassC { H2ClassC (int a) {} } // end class H2ClassC class H2ClassD extends H2ClassC{    } // end class H2ClassD error with this is:    actual and formal argument lists differ in length that means we extend H2ClassD using H2ClassC but the problem is In H2 ClassC we have constructer taking an integer as an argument but there is no constructer in H2ClassD which passes integer as an argument to H2ClassC. The reason here is When ever we create an object for base class first of all super class constructer will be called. class A extends B{    public A(){        System.out.print("A");    }    public static void main(String args[]){        new A();        System.out.println();    } } class B{    public B(){        System.out.print("B");    } } here the output is BA not AB. To resolve this error: 1)pass an integer to H2ClassC form H2ClassD using super(int ) method 2)adding a default constructer to H2ClassC

//using super(int a); public class H2ClassC { H2ClassC (int a) {} } // end class H2ClassC class H2ClassD extends H2ClassC{    H2ClassD(int a){        super(a);    } } // end class H2ClassD

//using default constrcuter public class H2ClassC { H2ClassC(){} //default Constructer H2ClassC (int a) {} } // end class H2ClassC class H2ClassD extends H2ClassC{    } // end class H2ClassD