[java]
/*
* 程序头部注释开始
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：继承的练习
* 作 者：薛广晨
* 完成日期：2012 年 10 月 17 日
* 版 本号：x1.0
* 对任务及求解方法的描述部分
* 输入描述：
* 问题描述: （1）封装一个People类型，具有height和weight属性，具有speakHello、averageHeight、averageWeight功能。
（2）封装一类ChinaPeople类型是People的子类，新增chinaMartial功能，override超类的speakHello、averageHeight、averageWeight功能。
（3）封装一类AmericanPeople类型是People的子类，新增AmericanBoxing功能，override超类的speakHello、averageHeight、averageWeight功能。
（4）封装一类BeijingPeople类型是ChinaPeople的子类，新增BeijingOpera功能，override超类的speakHello、averageHeight、averageWeight功能。
（5）用一个程序执行入口Test测试上述对象
* 程序输出：
* 程序头部的注释结束
*/
//People类
package xgc;
public class People {
private double height;
private double weight;
public People()
{
this.height = 10;
this.weight = 10;
}
public People(double height, double weight)
{
this.height = height;
this.weight = weight;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
public void speakHello()
{
System.out.println("Hello");
}
public void averageHeight()
{
}
public void averageWeight()
{
}
}
//ChinaPeople
package xgc;
public class ChinaPeople extends People {
public void chinaMartial()
System.out.println("ChinaPeople 太极 very good");
}
public void speakHello()
{
System.out.println("ChinaPeople 说 你好");
}
public void averageHeight()
{
setHeight(1.7);
System.out.println("ChinaPeople averageHeight = "+ getHeight());
}
public void averageWeight()
{
setWeight(70);
System.out.println("ChinaPeople averageWeight = "+ getWeight());
}
}
//AmericanPeople
package xgc;
public class AmericanPeople extends People{
public void AmericanBoxing(){
System.out.println("AmericanPeople Boxing very good");
}
public void speakHello()
{
System.out.println("AmericanPeople say Hello");
}
public void averageHeight()
{
setHeight(1.8);
System.out.println("AmericanPeople averageHeight = "+ getHeight());
}
public void averageWeight()
{
setWeight(75);
System.out.println("AmericanPeople averageWeight = "+ getWeight());
}
}
//BeijingPeople
package xgc;
public class BeijingPeople extends ChinaPeople{
public void BeijingOpera(){
System.out.println("BeijingOpera very good");
}
public void speakHello()
{
System.out.println("BeijingPeople 说 你好");
}
public void averageHeight()
{
setHeight(1.75);
System.out.println("ChinaPeople averageHeight = "+ getHeight());
}
public void averageWeight()
{
setWeight(73);
System.out.println("AmericanPeople averageWeight = "+ getWeight());
}
}
//测试类Test
packag