---

一、题1

1.1 问题描述

 (1)使用继承编写人类、教师、学生类的实体类。(2)编写测试类，实例化教师和学生类对象并显示。

1.2 代码块

public class Human {
    private String name;
    private String age;

    //构造方法
    public Human() {}

    public Human(String name,String age) {
        this.setName(name);
        this.setAge(age);
    }

    //age与name的get,set方法
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    //父类方法
    public void work() {
        System.out.printf("这是父类的方法");
    }
}

public class Students extends Human {
    //构造方法
    public Students(String name, String age) {
        super(name, age);//调用父类构造方法传递参数
    }

    //重写父类方法
    public void work() {
        System.out.println("学生爱读书");
    }
}

public class Teachers extends Human {
    //构造方法
    public Teachers(String name, String age) {
        super(name,age);
    }
    
    //重写父类方法
    public void work() {
        System.out.println("老师爱教书");
    }
}

public class TestDemo {
    public static void main(String[] args) {
        System.out.println("调用setName方法（顺序：学生类，老师类）");
        Students s=new Students("张三","21");
        System.out.println(s.getName());
        s.work();
        Teachers t=new Teachers("赵老师","35");
        System.out.println(t.getName());
        t.work();
    }
}

1.3 运行截图

二、题2

2.1 问题描述

 有一个水果箱(Box),箱子里装有水果(Fruit),每一种水果都有不同的重量和颜色，水果有：苹果，梨，桔 子。每个苹果(Apple)都有不同的重量和颜色，每个桔子(Orange)都有不同的重量和颜色，每个梨(Pear)都有不同的重量和颜色。可以向水果箱(Box)里添加水果(addFruit),也可以取出水果(getFruit),还可以显示水果的重量和颜色。编写代码实现上述功能。

2.2 代码块

public class Fruit {
    //属性
    private String name;
    private String color;
    private int weight;

    //set get方法
    public String getColor() {
        return color;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public int getWeight() {
        return weight;
    }
    public void setWeight(int weight) {
        this.weight = weight;
    }
    //public Fruit() {} //构造方法
    public Fruit(String name,String color,int weight) {
        this.name=name;
        this.color = color;
        this.weight = weight;
    }

    //显示信息
    public String toString() {
        return getName()+"  "+getWeight()+"  "+getColor();
    }
}

public class Apple extends Fruit {
    public Apple(String name,String color,int weight) {
        super(name,color,weight);
    }
}

public class Orange extends Fruit {
    public Orange(String name,String color,int weight) {
        super(name,color,weight);
    }
}

public class Pear extends Fruit{
    public Pear(String name,String color,int weight) {
        super(name,color,weight);

    }
}

import java.util.ArrayList;

public class Box {
    ArrayList<Fruit> flist = new ArrayList<Fruit>();
    //添加水果方法
    public void addFruit(Fruit fruit) {
        flist.add(fruit);

    }
    //取出水果方法
    public void  getFruit(Fruit fruit) {
        flist.remove(fruit);

    }
    //显示
    public void show() {
        for(Fruit fruit : flist) {
            System.out.println(fruit);
        }
    }

    public static void main(String[] args) {
        Fruit f1 = new Apple("apple","red",3);
        Fruit f2 = new Pear("pear","yellow",6);
        Fruit f3 = new Orange("orange","yellow",8);
        Box b = new Box();
        b.addFruit(f1);
        b.addFruit(f2);
        b.addFruit(f3);
        System.out.println("显示水果:");
        b.show();
        b.getFruit(f3);
        System.out.println("取出水果后：");
        b.show();
    }
}

2.3 运行截图