语言

public class Example {
   public static void main(String args[]){
	  ChinaPeople  chinaPeople=new ChinaPeople();
	  AmericanPeople americanPeople=new AmericanPeople();
	  BeijingPeople  beijingPeople =new BeijingPeople ();
	  beijingPeople.speakHello();  
	  chinaPeople.speakHello();
	  americanPeople.speakHello();
	  beijingPeople.averageHeight();  
	  chinaPeople.averageHeight();
	  americanPeople.averageHeight();
	  beijingPeople.averageWeight();  
	  chinaPeople.averageWeight();
	  americanPeople.averageWeight();
	  beijingPeople.beijingOpera();  
	  chinaPeople.chianGongfu();
	  americanPeople.americanBoxing();
   }
}

public class People {
	protected double weight,height;
	public void speakHello(){
		System.out.println("yayayaya");
	}
	public void averageHeight1(){
		height=173;
		System.out.println("average height:"+height);
	}
	public void averageWeight(){
		weight=70;
		System.out.println("average weight:"+weight);
	}

}
public class ChinaPeople extends People{
	public void speakHello(){
		System.out.println("您好");
	}
    public void averageHeight(){
    	height=168.78;
    	System.out.println("中国人的平均身高:"+height+"厘米");
    }
    public void averageWeight(){
    	weight=65;
    	System.out.println("中国人的平均体重:"+height+"千克");
    }
    public void chianGongfu(){
    	System.out.println("站如松，坐如钟，睡如弓");
    }
}

public class AmericanPeople extends People{
	public void speakHello(){
		System.out.println("How do you do");
	}
    public void averageHeight(){
    	height=176;
    	System.out.println("American's average height:"+height+"cm");
    }
    public void averageWeight(){
    	weight=75;
    	System.out.println("American's average weight:"+weight+"kg");
    }
    public void americanBoxing(){
    	System.out.println("直拳，勾拳，组合拳");
    }

}

public class BeijingPeople extends ChinaPeople{
    public void averageHeight(){
    	height=172.5;
    	System.out.println("北京人的平均身高:"+height+"厘米");
    }
    public void averageWeight(){
    	weight=70;
    	System.out.println("北京人的平均体重:"+height+"千克");
    }
    public void beijingOpera(){
    	System.out.println("花脸，青衣、花旦和老生");
    }

}