Java 对Vector容器中的对象按照属性值排序

代码：

import java.io.*;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Vector;

class Box{
    public float score;
}

class BoxComparator implements Comparator<Box> {
    public int compare(Box a, Box b) {
        if(a.score < b.score){
            return 1;
        }else if(a.score == b.score){
            return 0;
        }else{
            return -1;
        }
    }
}


class test  
{
    public static void main (String[] args) throws java.lang.Exception
    {
        
        
        Vector<Box> boxes = new Vector<Box>();
        Box b1 = new Box();
        b1.score = 0.1f;
        
        Box b2 = new Box();
        b2.score = 0.2f;
        
        Box b3 = new Box();
        b3.score = 0.3f;
        
        Box b4 = new Box();
        b4.score = 0.4f;
        
        boxes.add(b1);
        boxes.add(b2);
        boxes.add(b3);
        boxes.add(b4);
        
        Comparator<Box> cmp =new BoxComparator();
        Collections.sort(boxes, cmp);
        
        for(int i=0; i<boxes.size();i++){
            Box box = boxes.get(i);
            System.out.printf("%f\n",box.score);
        }
    }
}

输出：

0.400000
0.300000
0.200000
0.100000

修改BoxComparator中的compare函数可以改变为顺序或逆序排序
参考链接：
https://blog.csdn.net/da_kao_la/article/details/79548867