Example

class C {

public String toString(){

return "x="+getX();

}

int getX(){ return defaultX;}

int defaultX = 0;

}

class CC1 extends C {

int getX(){ return x1;}

int x1 = 1;

}

class CC2 extends C {

int getX(){ return x2;}

int x2 = 2;

}

class TestExtend {

public static void main(String[] s){

C o1 = new CC1();

C o2 = new CC2();

System.out.println(o1.toString());

System.out.println(o2.toString());

}