Chapater4 实验一

People.javapublic class People {protected double height,weight;public void speakHello(){System.out.println("yayaya");}public void averageHeight(){height=173;System.out.println("averageHeight"+height);}public void averageWeight(){weight=70;System.out.println("averageWeight"+weight);}}CinaPeople.javapublic class ChinaPeople extends People {public void chinaGongFu(){System.out.println("坐如钟。站如松，弯如弓");System.out.println("直拳，勾拳，组合拳");}    public void speakHello(){    System.out.println("你好");    }    public void averageHeight(){     height=168.68;     System.out.println("中国人的平均身高"+weight+"厘米");            }    public void averageWeight(){   weight=70.0;    System.out.println("中国人的平均体重是"+weight+"千克");    }    }AmericanPeople.javapublic class AmericanPeople extends People{    public void chinaGongFu(){    System.out.println("坐如钟，站如松，睡如弓");    }    public void averageHeight(){    height=166.0;    System.out.println("Aemerican's average height is"+height+"厘米");    }    public void averageWeight(){    weight=75.0;    System.out.println("American's average weight is:"+weight+"千克");    }    public void speakHello(){    System.out.println("how do you do!"); }}BeijingPeople.javapublic class BeijingPeople extends ChinaPeople {public void beijingOpera(){System.out.println("花脸，青衣，花旦和老生");}    public void averageHeight(){    height=172.5;    System.out.println("北京人的平均身高是:"+height+"厘米");    }    public void averageWeight(){    weight=65.0;    System.out.println("北京人的平均体重是"+weight+"千克");    }    public void speakHello(){    System.out.println("Hello");        }}Test.javapublic class Test {     public static void main(String args[]){     ChinaPeople c=new ChinaPeople();     AmericanPeople a=new AmericanPeople();     BeijingPeople b=new BeijingPeople();     c.speakHello();     b.speakHello();     a.speakHello();     b.averageHeight();     a.averageHeight();     c.averageHeight();     c.averageWeight();     a.averageWeight();     b.averageWeight();     b.beijingOpera();     c.chinaGongFu();     a.chinaGongFu();         }}