java开发实战经典（第二版）P217 6

6.6   使用面向对象的概念表示出下面的生活场景：

小明去超市买东西，所有买到的东西都放在了购物车之中，最后到收银台一起结账。

package book;

interface Goods {

public double getPrice();

public String getName();

}

class Toys implements Goods {

private String name;

private double price;

static String goodName = "玩具";

public double getPrice() {

return this.price;

}

public String getName() {

return this.name;

}

Toys(String name, double price) {

this.name = name;

this.price = price;

}

};

class Clothes implements Goods {

private String name;

private double price;

static String goodName = "服装";

public double getPrice() {

return this.price;

}

public String getName() {

return this.name;

}

Clothes(String name, double price) {

this.name = name;

this.price = price;

}

};

class Drinks implements Goods {

private String name;

private double price;

static String goodName = "饮品";

public double getPrice() {

return this.price;

}

public String getName() {

return this.name;

}

Drinks(String name, double price) {

this.name = name;

this.price = price;

}

};

class Foods implements Goods {

private String name;

private double price;

static String goodName = "食品";

public double getPrice() {

return this.price;

}

public String getName() {

return this.name;

}

Foods(String name, double price) {

this.name = name;

this.price = price;

}

};

class ShopTotal {

private Goods[] Good;

private int foot;

private double total;

static int len = 5;

ShopTotal() {

this.Good = new Goods[len];

}

public void add(Goods good) {

if (this.foot >= this.Good.length) {

Goods[] goods = new Goods[this.Good.length + len];

System.arraycopy(this.Good, 0, goods, 0, this.Good.length);

this.Good = goods;

}

this.Good[this.foot] = good;

this.foot++;

}

public double totalMoney() {

for (int i = 0; i < this.foot; i++) {

total += Good[i].getPrice();

}

return this.total;

}

public int getNumber() {

return this.foot;

}

};

public class JiOu {

public static void main(String args[]) {

ShopTotal st = new ShopTotal();

st.add(new Toys("手枪", 25.5));

st.add(new Toys("飞机", 84.3));

st.add(new Drinks("伊利（箱）", 73.5));

st.add(new Foods("乐事薯片", 8.5));

st.add(new Clothes("牛仔裤", 120));

st.add(new Clothes("白T", 60));

System.out.println("共购买" + st.getNumber() + "件商品,合计" + String.format("%.2f", st.totalMoney()) + "元");

}

}

运行结果：

共购买6件商品,合计371.80元

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