面向对象机试题

package com.yenange.t2;
import java.util.ArrayList;
import java.util.List;

public class FruitTest {
// 3． 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（weight）和颜色（color），
// 水果有：苹果（apple），梨（pear）。可以向水果箱（box）里添加水果（addFruit），也可以取出水果（getFruit）。
// 请编写java代码实现上述功能。
public static void main(String[] args) {
Box box = new Box();
box.addFruit(new Apple(25, "红色"));
box.addFruit(new Pear(30, "黄色"));
System.out.println("取之前的水果箱的总数量:"+box.num);
for (Fruit fruit : box.list) {
System.out.println(fruit);
}
System.out.println("/n取出来的水果是:");
Fruit fruit=box.getFruit(1);
System.out.println(fruit);
System.out.println("取之后的水果箱的总数量:"+box.num);
}
}

class Box {
List list = new ArrayList();
public int num = 0;

public Box() {
}

public void addFruit(Fruit f) {
list.add(f);
num++;
}

public Fruit getFruit(int index) {
Fruit f = list.get(index);
list.remove(f);
num--;
return f;
}
}

class Fruit {
private int weight;
private String color;

public Fruit(int weight, String color) {
this.weight = weight;
this.color = color;
}

public int getWeight() {
return weight;
}

public void setWeight(int weight) {
this.weight = weight;
}

public String getColor() {
return color;
}

public void setColor(String color) {
this.color = color;
}

public String toString() {
return "水果名称:" + this.getClass().getSimpleName() + "/t颜色:"
+ this.getColor() + "/t重量:" + this.getWeight()+"克";
}
}

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

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