/* * To change this template, choose Tools | Templates * and open the template in the editor. */package chenchao3;/** * * @author williechen */public class Ex1 {}class Sup {    private int feildInSup;    Sup(int f) {        this.feildInSup = f;        System.out.println("sup :" + this.feildInSup);    }}class Sub extends Sup {    private int fieldInSub;    Sub(int sup, int sub) {       super(sup);        this.fieldInSub = sub;        System.out.println("sub : " + this.fieldInSub);    }}