Java：实现多子类与父类的继承，并实现各自类的方法（第九周）

深藏阁楼爱情的钟 2022-05-15 01:57 63阅读 0赞

题目来源：大工慕课 [链接][Link 1]  
作者：Caleb Sung

# 题目要求 #

1.  阅读幻灯片中关于**Person**，**Employee**和**Manager**的源代码；
2.  实现UML类图中所示的三个类：  
    ![这里写图片描述][70]
3.  **Athlete**的`getDescription()`方法应该返回一个字符串，例如`An Athlete XXXName with height of XXX and weight of XXX`；
4.  **BasketballPlayer**中的`getDescription()`应该返回一个字符串，例如`A basketball player XXXName with shooting level of XXX`；
5.  **BaseballPlayer**中的`getDescription()`应该返回一个字符串，例如`A baseball player XXXName with hitting level of XXX`；
6.  在主要功能中，实现一个由3名运动员组成的阵列，并分别与`Athlete`，`BasketballPlayer`和`BaseballPlayer`一起填充阵列。 然后，使用**循环**打印阵列中所有运动员的描述信息。

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# 参考代码 #

## Athlete类（父类） ##

class Athlete{
        private String name;
        private int height;
        private int weight;
    
        public Athlete(String n, int h, int w){
            name = n;
            height = h;
            weight = w;
        }
    
        public String getName(){
            return name;
        }
    
        public String getDescription() {
            return "An Athlete "+ name + " with height of "+ height +" and weight of "+ weight + ".";
        }
    }

## BasketballPlayer类（子类1） ##

class BasketballPlayer extends Athlete{ 
        private int shootLv;
    
        public BasketballPlayer(String n, int h, int w, int sl) {
            super(n, h, w);
            shootLv = sl;
        }
    
        public String getDescription() {
            return "A basketball player "+ getName() +" with shooting level of "+ shootLv + ".";
        } 
    }

## BaseballPlayer类（子类2） ##

class BaseballPlayer extends Athlete{ 
        private int hitLv;
    
        public BaseballPlayer(String n, int h, int w, int hl) {
            super(n, h, w);
            hitLv = hl;
        }
    
        public String getDescription() {
            return "A baseball player "+ getName() +" with hitting level of "+ hitLv + ".";
        }
    }

## 主函数与测试用例 ##

public class AthletesTset {
    
        public static void main(String[] args) {
            //Tests
            Athlete [] athletes = new Athlete[3];
    
            athletes[0] = new Athlete("Bob", 188, 75);
            athletes[1] = new BasketballPlayer("Sam", 190, 80, 6);
            athletes[2] = new BaseballPlayer("Tom", 179, 69, 8);
    
            for(Athlete a : athletes) {
                System.out.println(a.getDescription());
            }
    
        }
    }

--------------------

# 运行结果 #

An Athlete Bob with height of 188 and weight of 75.
    A basketball player Sam with shooting level of 6.
    A baseball player Tom with hitting level of 8.

[Link 1]: https://mooc.dlut.edu.cn/
[70]: /images/20220515/ebbe7b42ca234ac590839c1802c0cb45.png