文档介绍：实验 4 继承与多态一、实验目的与要求 1 、掌握类的继承关系和派生方法; 2 、掌握多态的概念与使用; 3 、掌握接口的定义与使用; 二、实验内容继承与多态:编写一个类 SuperClass ,有成员数据和成员方法,另一个 SubClas s 为 SuperClass 的子类,编写一个接口,增加与 SuperClass 同名成员数据和成员方法,增加和 SuperClass 成员异名的成员数据和成员方法;在主方法里面调用这些成员方法,并输出这些成员数据。三、实验器材微机+windows 操作系统+eclipse 四、实验步骤 package shiyansi; public interface study { public abstract void printmessage(); } package shiyansi; public class Surperclass { protected int x =2; protected String y= "our university is very beautiful" ; public void set( int xx,String yy) {x =xx; y =yy; } public void show() { ("now we use superclass"+"\tx="+x); } package shiyansi; public class Subclass extends Surperclass implements study { protected int x =5; protected String z; public void set( int xx,String zz) {x =xx; z =zz; } public void show() { ("this is subclass"+"\tx="+x); } public void printmessage() { System. out .println( "subclass member are "+ "\tx=" +x+ "\ty=" +y+ "\tz=" +z ); }} package shiyansi; public class test { /** * ***@param args */ public static void main(String[] args) { // TODO Auto-generated method stub Surperclass sa= new Surperclass(); Subclass sb= new Subclass(); /// 继承 System. out .println( " 继承测试" ); (); (); (200, "super is father class" ); (300, "sub is so