java * 第八周* 任务【一】继承的练习

1.继承的练习（必做）

（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。

 

 

 

package hu;

public class People {
	
	private double height;
	private double  weight;
	
	public People(double height,double weight)
	{
		this.height = height;
		this.weight = weight;		
	}	

	public People() {
	}

	public void speakHello()
	{
		System.out.println("speakHello");
	}

	public double averageHeight(double sum,int num)
	{
	   return sum/num;
	}
     public double averageWeight(double sum,int num)
    {
	   return sum/num;
    }
}

 

package hu;

	public class ChinaPeople extends People {
		
		public ChinaPeople(double height, double weight) {
			super(height, weight);		
		}

		public ChinaPeople() {
			// TODO Auto-generated constructor stub
		}

		public void speakHello()
	    {
	      System.out.println("Hello malin");
	      
	    }
	    
	    public double averageHeight(double sumHeight, int num)
	    {
	       return sumHeight/num;
	    }
	    
	    public double averageWeight(double sumWeight, int num)
	    {

	        return  sumWeight/num;
	    }
	    
	    public void chinaMartial()
	    {
	    	System.out.println("chinaMartial");
	    }

	}

 

package hu;

public class AmericanPeople extends People{

	public AmericanPeople(double height, double weight) {
		super(height, weight);		
	}

	public AmericanPeople() {
		// TODO Auto-generated constructor stub
	}

	public void AmericanBoxing()
	{
		System.out.println("AmericanBoxing");
	}
	
	public void speakHello()
	{
		System.out.println("speakHello");
	}

	public double averageHeight(double sum,int num)
	{
	   return sum/num;
	}
     public double averageWeight(double sum,int num)
    {
	   return sum/num;
    }
	}

 

package hu;

public class BeijingPeople extends ChinaPeople{
	public BeijingPeople(double height, double weight)
	{
		super(height,weight);		
	}
	
	public void BeijingOpera()
	{
		System.out.println("BeijingOpera");
	}

    public double averageHeight(double sumHeight, int num)
    {
       return sumHeight/num;
    }
    
    public double averageWeight(double sumWeight, int num)
    {

        return  sumWeight/num;
    }
    
    public void chinaMartial()
    {
    	System.out.println("chinaMartial");
    }
}

 

package hu;

public class Test123 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
				People p = new People();			
				p.speakHello();				
				double m = p.averageHeight(3, 5);
				System.out.println(m);
				
				ChinaPeople C = new ChinaPeople();
				C.speakHello();
				C.chinaMartial();
				
				AmericanPeople A = new AmericanPeople();
				A.speakHello();
				A.AmericanBoxing();
				
			}
	}