The constructor should be called just for the first object only.

Question

hello everybody!
Please check out this code:
class father
     father()
class son1 extends father
     son1()
class son2 extends father
     son2()
public check
    public static void main( String args[] )
     son1 object1=new son1();
     son2 object2=new son2();
In both the case for
son1 object1=new son1();*
son2 object2=new son2();*
the constructor of the father class is invoked, i.e,
father()
+{+
+}+
What I want is the father constructor should be invoked only once i.e, when the first object(object1) is created and when the second object(object2) is created the father constructor should not be invoked. Is that possible in java, if yes, how?. Where should I make the changes in the given code?
Please advice,
Thank you.

Answer 1

No, not the way you have designed it.
What you have is
Son1 IS A Father
Son2 IS A Father
Are you sure that is what you want, while the Sons will most likely end up as Fathers, as you only want the Father constructor called once it sounds like you want a
Son1 HAS A Father.
To do this you need to user composite relation.
I.e.
class Father {
   Father() {
       System.out.println( "Daddy!" );
class Son {
  private final Father myFather;
   Father( Father myFather ) {
       this.myFather = myFather;
       System.out.println( "Son" );
public static void main( String[] args ) {
    Father baba = new Father();
    Son jerry = new Son( baba );
    Son fred = new Son( baba );
}