Java Collection.sort 排序升序, 降序问题

不多说，记住2点, 直接上代码(下面是降序):

package mall;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

public class TestSort2 {

    public static void main(String[] args) {

        List<Test> list = new ArrayList<Test>();

        String [] n = {"a", "b", "c", "d", "e", "f", "g" , "h" , "i", "j", "k"};

        double [] d = {0, 0, 34581, 0, 22017, 20807, 0 , 0 , 20443.2, 44457,0};

        double [] a = {400, 0, 400, 200, 150, 400, 600, 300, 200, 500, 0};

        for (int i = 0; i < a.length; i++) {

            Test s = new Test(n[i], d[i], a[i]);

            list.add(s);

        }

        //假如A的值大于B，你返回1 ,这样调用Collections.sort()方法就是升序

        //假如A的值大于B，你返回-1,这样调用Collections.sort()方法就是降序

        Collections.sort(list, new Comparator<Test>() {

            //总销售额(大->小)

            public int compare(Test o1, Test o2) {

                if(o1.getTotalPrice().compareTo(o2.getTotalPrice()) == 1)

                    return -1;

                return 0;

            }

        });

        for (int i = 0; i < list.size(); i++) {

            Test s = list.get(i);

            System.out.println("价格:"+s.getTotalPrice() + " , 面积:" + s.getArea());

        }

    }

    static class Test {

        private String name;

        private Double totalPrice;

        private Double area;

        public Test(String name, double totalPrice, double area){

            this.name = name;

            this.totalPrice = totalPrice;

            this.area = area;

        }

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public Double getTotalPrice() {

            return totalPrice;

        }

        public void setTotalPrice(Double totalPrice) {

            this.totalPrice = totalPrice;

        }

        public Double getArea() {

            return area;

        }

        public void setArea(Double area) {

            this.area = area;

        }

    }

}

Java Collection.sort 排序升序, 降序问题的相关教程结束。