Java学习list集合练习二
题目
设计电商类，其中包含商品类，商品类属性（名称、价格、介绍、厂家、生产地址），继承类有食品类、电气类、服装类、玩具类。
食品类属性：有效时长、重量
电气类属性：电压、功率、重量
服装类属性：材质、面料、成分
玩具类属性：材质、分类、适用年龄
要求：
1、设计商品类，封装商品信息
2、设计继承类，继承商品类，封装继承商品信息
3、设计商城，商城中有一个各类商品的集合，客户可以看到所有商品，也可以根据不同继承类查询商品，每类商品不少以五种
4、查询商城中价格超过100元的商品
5、查询生产地是“北京”的商品
6、根据商品价格给商城排序，价格从高到低
7、设计购物车，购物车包括商品名称和商品数量，输入商品名称，显示商品信息，输入数量，加入购物车，完成添加后，输入“结账”，计算所有商品价格。
8、设计抽奖功能，查询所有商品，生成随机数，随机数范围0到商品集合长度，生成随机数后，通过下标获取商品，显示商品信息
解答
package homework; public class DQ extends ShangP { private int V; private int P; private double weight; public DQ(String name, double price, String introduce, String producer, String address, int v, int p, double weight) { super(name, price, introduce, producer, address); V = v; P = p; this.weight = weight; } public int getV() { package homework; public class FZ extends ShangP { private String quality; private String inner; private String composition; public FZ(String name, double price, String introduce, String producer, String address, String quality, String inner, String composition) { super(name, price, introduce, producer, address); this.quality = quality; this.inner = inner; this.composition = composition; } /** * @return the quality */ public String getQuality() { return quality; } /** * @param quality the quality to set */ public void setQuality(String quality) { this.quality = quality; } /** * @return the inner */ public String getInner() { return inner; } /** * @param inner the inner to set */ public void setInner(String inner) { this.inner = inner; } /** * @return the composition */ public String getComposition() { return composition; } /** * @param composition the composition to set */ public void setComposition(String composition) { this.composition = composition; } /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { return "FZ [name=" + super.getName() + ", price=" + super.getPrice() + ", introduce=" + super.getIntroduce() + ", producer=" + super.getProducer() + ", address=" + super.getAddress() + ",quality=" + quality + ", inner=" + inner + ", composition=" + composition + "]"; } } package homework; public class SW extends ShangP { private double hour; private double weight; /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { return "SW [name=" + super.getName() + ", price=" + super.getPrice() + ", introduce=" + super.getIntroduce() + ", producer=" + super.getProducer() + ", address=" + super.getAddress() + ",hour=" + hour + ", weight=" + weight + "]"; } public SW(String name, double price, String introduce, String producer, String address, double hour, double weight) { super(name, price, introduce, producer, address); this.hour = hour; this.weight = weight; } public double getHour() { return hour; } public void setHour(double hour) { this.hour = hour; } public double getWeight() { return weight; } public void setWeight(double weight) { this.weight = weight; } } package homework; public class WJ extends ShangP { private String quality; private String kind; private int age; public WJ(String name, double price, String introduce, String producer, String address, String quality, String kind, int age) { super(name, price, introduce, producer, address); this.quality = quality; this.kind = kind; this.age = age; } /** * @return the quality */ public String getQuality() { return quality; } /** * @param quality the quality to set */ public void setQuality(String quality) { this.quality = quality; } /** * @return the kind */ public String getKind() { return kind; } /** * @param kind the kind to set */ public void setKind(String kind) { this.kind = kind; } /** * @return the age */ public int getAge() { return age; } /** * @param age the age to set */ public void setAge(int age) { this.age = age; } /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { return "WJ [name=" + super.getName() + ", price=" + super.getPrice() + ", introduce=" + super.getIntroduce() + ", producer=" + super.getProducer() + ", address=" + super.getAddress() + ",quality=" + quality + ", kind=" + kind + ", age=" + age + "]"; } } package homework; public class ShangP implements Comparable{ private String name; private double price; private String introduce; private String producer; private String address; public ShangP(String name, double price, String introduce, String producer, String address) { this.name = name; this.price = price; this.introduce = introduce; this.producer = producer; this.address = address; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public String getIntroduce() { return introduce; } public void setIntroduce(String introduce) { this.introduce = introduce; } public String getProducer() { return producer; } public void setProducer(String producer) { this.producer = producer; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { return "ShangP [name=" + name + ", price=" + price + ", introduce=" + introduce + ", producer=" + producer + ", address=" + address + "]"; } @Override public int compareTo(ShangP o) { if(this.getPrice()>o.getPrice()) return -1; else if(this.getPrice()<o.getPrice()) return 1; else return 0; } } package homework; public class gouwuche { private String name; private int num; private double price; public gouwuche(String name, int num, double price) { super(); this.name = name; this.num = num; this.price = price; } /** * @return the name */ public String getName() { return name; } /** * @param name the name to set */ public void setName(String name) { this.name = name; } /** * @return the num */ public int getNum() { return num; } /** * @param num the num to set */ public void setNum(int num) { this.num = num; } /** * @return the price */ public double getPrice() { return price; } /** * @param price the price to set */ public void setPrice(double price) { this.price = price; } /* (non-Javadoc) * @see java.lang.Object#toString() */ @Override public String toString() { return "gouwuche [name=" + name + ", num=" + num + ", price=" + price + "]"; } } package homework; import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; public class ShangCheng { public static void main(String[] args) { ArrayList list = liebiao(); for (ShangP s : list) { System.out.println(s.toString()); } System.out.println("**价格高于100的有**"); for (ShangP n : list) { if (n.getPrice() > 100) { System.out.println(n); } } System.out.println("**产地是北京的有**"); for (ShangP n : list) { if (n.getAddress().equals("北京")) { System.out.println(n); } } System.out.println("**排序**"); Collections.sort(list); for (ShangP n : list) { System.out.println(n.toString()); } System.out.println("**请购物**"); double sum = 0; // ArrayList str=new ArrayList // while (true) { // System.out.print("请输入购买物品"); // String name = new Scanner(System.in).next(); // System.out.print("请输入购买数量"); // int num = new Scanner(System.in).nextInt(); // for (ShangP l : list) { // if (l.getName().equals(name)) { // // System.out.println(l); // // sum=l.getPrice(); // // sum*=num; // gouwuche gg = new gouwuche(name, num, l.getPrice()); // str.add(gg); // System.out.println("是否继续购买（是/结账）"); // String s = new Scanner(System.in).next(); // if (s.equals("结账")) { // for (gouwuche st:str) { // sum+=st.getNum()*st.getPrice(); // } // // System.out.println("您需要支付" + sum); // } // break; // } // } // } chou(); } public static void chou() { ArrayList(); list = liebiao(); int a = (int) (Math.random()*list.size()); System.out.println("抽到了"+list.get(a)); System.out.println(); } public static ArrayList liebiao() { ArrayList list = new ArrayList (); SW a1 = new SW("食物1", 12, "好", "大龙厂", "浙江", 9, 90); SW a2 = new SW("食物2", 12, "好", "大龙厂", "浙江", 9, 90); SW a3 = new SW("食物3", 12, "好", "大龙厂", "浙江", 9, 90); SW a4 = new SW("食物4", 12, "好", "大龙厂", "浙江", 9, 90); SW a5 = new SW("食物5", 12, "好", "大龙厂", "浙江", 9, 90); DQ b1 = new DQ("空调1", 10000, "好", "美的", "黑龙江", 220, 2500, 300); DQ b2 = new DQ("空调2", 10000, "好", "美的", "黑龙江", 220, 2500, 300); DQ b3 = new DQ("空调3", 10000, "好", "美的", "黑龙江", 220, 2500, 300); DQ b4 = new DQ("空调4", 10000, "好", "美的", "黑龙江", 220, 2500, 300); DQ b5 = new DQ("空调5", 10000, "好", "美的", "黑龙江", 220, 2500, 300); FZ c1 = new FZ("巴黎世家1", 1000, "优", "巴黎世家工厂", "广州", "涤纶", "棉麻", "布，水，线"); FZ c2 = new FZ("巴黎世家2", 1000, "优", "巴黎世家工厂", "广州", "涤纶", "棉麻", "布，水，线"); FZ c3 = new FZ("巴黎世家3", 1000, "优", "巴黎世家工厂", "广州", "涤纶", "棉麻", "布，水，线"); FZ c4 = new FZ("巴黎世家4", 1000, "优", "巴黎世家工厂", "广州", "涤纶", "棉麻", "布，水，线"); FZ c5 = new FZ("巴黎世家5", 1000, "优", "巴黎世家工厂", "北京", "涤纶", "棉麻", "布，水，线"); WJ d1 = new WJ("泡泡机1", 200, "差", "江南皮革厂", "江苏", "皮革", "益智玩具", 3); WJ d2 = new WJ("泡泡机2", 200, "差", "江南皮革厂", "北京", "皮革", "益智玩具", 3); WJ d3 = new WJ("泡泡机3", 200, "差", "江南皮革厂", "江苏", "皮革", "益智玩具", 3); WJ d4 = new WJ("泡泡机4", 200, "差", "江南皮革厂", "江苏", "皮革", "益智玩具", 3); WJ d5 = new WJ("泡泡机5", 200, "差", "江南皮革厂", "江苏", "皮革", "益智玩具", 3); list.add(a1); list.add(a2); list.add(a3); list.add(a4); list.add(a5); list.add(b1); list.add(b2); list.add(b3); list.add(b4); list.add(b5); list.add(c1); list.add(c2); list.add(c3); list.add(c4); list.add(c5); list.add(d1); list.add(d2); list.add(d3); list.add(d4); list.add(d5); return list; } } } public void setV(int v) { V = v; } public int getP() { return P; } public void setP(int p) { P = p; } public double getWeight() { return weight; } public void setWeight(double weight) { this.weight = weight; } @Override public String toString() { return "DQ [name=" + super.getName() + ", price=" + super.getPrice() + ", introduce=" + super.getIntroduce() + ", producer=" + super.getProducer() + ", address=" + super.getAddress() + ",V=" + V + ", P=" + P + ", weight=" + weight + "]"; } }