1 package GoodsSorting;
2 //实例类
3 public class GoodsParameter {
4 // 价格
5 private double price;
6 // 收藏量
7 private int favor;
8 // 商品名称
9 private String goodsname;
10 //无参构造
11 public GoodsParameter() {
12 super();
13 }
14 //带参构造
15 public GoodsParameter(String goodsname, double price, int favor) {
16 super();
17 this.price = price;
18 this.favor = favor;
19 this.goodsname = goodsname;
20 }
21 public double getPrice() {
22 return price;
23 }
24 public void setPrice(double price) {
25 this.price = price;
26 }
27 public int getFavor() {
28 return favor;
29 }
30 public void setFavor(int favor) {
31 this.favor = favor;
32 }
33 public String getGoodsname() {
34 return goodsname;
35 }
36 public void setGoodsname(String goodsname) {
37 this.goodsname = goodsname;
38 }
39 //重写tostring
40 @Override
41 public String toString() {
42 return "\t商品:" + getGoodsname() + "\t价格:" + getPrice() + "\t收藏量:"
43 + getFavor() + "\n";
44 }
45 }
1 package GoodsSorting;
2 //排序工具类
3 import java.util.Comparator;
4
5 public class PriceSort implements Comparator<GoodsParameter> {
6
7 public int compare(GoodsParameter o1, GoodsParameter o2) {
8 int i=0;
9 //按价格排序 正序
10 if ((o1.getPrice() - o2.getPrice()) > 0) {
11 i=1;
12
13 }
14 else {
15 i=-1;
16
17 }
18 return i;
19
20 }
21
22 }
1 package GoodsSorting;
2
3 import java.util.Comparator;
4
5 public class FavorSort implements Comparator<GoodsParameter> {
6
7 public int compare(GoodsParameter o1, GoodsParameter o2) {
8 int i = 0;
9 // 按收藏排序 正序
10 if (o1.getFavor()-o2.getFavor()<0) { //逆序只需修改为>0
11 i=-1;
12 }
13 return i;
14 }
15
16 }
1 package GoodsSorting;
2
3 import java.util.Comparator;
4
5 public class NameSort implements Comparator<GoodsParameter> {
6 public int compare(GoodsParameter o1, GoodsParameter o2) {
7 int result = o1.getGoodsname().compareTo(o2.getGoodsname());
8 return result;
9 }
10
11 }
1 package GoodsSorting;
2 //测试类
3 import java.util.ArrayList;
4 import java.util.Collections;
5 import java.util.List;
6
7 public class TestApp {
8 public static void main(String[] args) {
9 List<GoodsParameter> list = new ArrayList<GoodsParameter>();
10 list.add(new GoodsParameter("iphone", 5200, 110000));
11 list.add(new GoodsParameter("xiaomi", 1999, 50000));
12 list.add(new GoodsParameter("huawei", 1899, 60054));
13 list.add(new GoodsParameter("samsung", 4500, 80000));
14 list.add(new GoodsParameter("meizu", 1699, 125863));
15 // 排序前
16 System.out.println("原序:**********************");
17 System.out.println(list);
18
19 Collections.sort(list, new PriceSort()); // 注意这里是collections
20 // 按价格排序后
21 System.out.println("价格排序:**********************");
22 System.out.println(list);
23 // 收藏量正序
24 System.out.println("收藏量排序:**********************");
25 Collections.sort(list, new FavorSort());
26 System.out.println(list);
27 // 名称正序
28 System.out.println("名称排序:**********************");
29 Collections.sort(list, new NameSort());
30 System.out.println(list);
31 }
32 }
