从未排序的ArrayList中创建排序后的数组

Question

我有一个用类结果的对象填充的ArrayList，每个结果都有一个名为value的属性。我现在想要创建一个数组，其中填充了与ArrayList中相同的内存位置的引用，但现在为了使对象的最高值位于第一个位置，第二个位置的第二高位等等。

我已经在这里搜索，但还没有发现任何其他帖子喜欢它。

Answer 1

有多种方法可以使用Gauava或lambda表达式来解决它。

希望这个实现能够解决您的问题。

package com; 

import java.util.ArrayList; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.List; 

public class TestDemo { 


public static void main(String[] args) { 


    List <HockeyPlayer> players = new ArrayList <HockeyPlayer>(); 
    HockeyPlayer obj1 = new HockeyPlayer(); 
    obj1.goalsScored = 22; 
    players.add(obj1); 
    HockeyPlayer obj2 = new HockeyPlayer(); 
    obj2.goalsScored = 11; 
    players.add(obj2); 
    HockeyPlayer obj3 = new HockeyPlayer(); 
    obj3.goalsScored = 111; 
    players.add(obj3); 
    HockeyPlayer obj4 = new HockeyPlayer(); 
    obj4.goalsScored = 3; 
    players.add(obj4); 

    Collections.sort(players, new Comparator <HockeyPlayer>() { 
    @Override public int compare(HockeyPlayer player1, HockeyPlayer player2) { 
    return player1.goalsScored - player2.goalsScored; 
    } 

    }); 

    for (int i = 0; i < players.size(); i++) { 
    System.out.println(players.get(i).goalsScored); 
    } 

    HockeyPlayer array[] = new HockeyPlayer[players.size()]; 

    players.toArray(array); // contains reference 


    for (int i = 0; i < array.length; i++) { 
    System.out.println(array[i].goalsScored); 
    } 


} 

} 

class HockeyPlayer { 
public int goalsScored; 

}