java - Pojo类属性比较

Question

我有一个包含两个属性的类:

public class player{
    public player(String playerName,int points){
        this.playerName=playerName;
        this.points=points;
    }
    public String getPlayerName() {
        return playerName;
    }
    public void setPlayerName(String playerName) {
        this.playerName = playerName;
    }
    public int getPoints() {
        return points;
    }
    public void setPoints(int points) {
        this.points = points;
    }
    private String playerName;
    private int points;
}

我有 arrayList 类包含 palyer 对象的集合。

List palyers=new ArrayList();
players.add(new player("mike",2));
players.add(new player("steve",3));
players.add(new player("jhon",7));
players.add(new player("harry",5);

这里我的问题是如何显示积分差异最小的玩家姓名。

输出:

Based on the example code i written:

Mike and steve is the output

THis way comparison should happen:

mike to steve --> 1

mike to jhon--->5

mike to harry-->3

steve to mike -->1
steve to jhon--->5
steve to harry--->3

jhon to mike-->5
jhon to steve-->4
jhon to harry--->2

harry to mike -->3

harry to steve-->2

harry to jhon -->2

Based on above comparison mike and steve should display

有没有java API来比较属性？

Answer 1

使用anonymous inner class , Comparator和 Collections.sort() :

    Collections.sort(palyers, new Comparator(){
        public int compare(Object o1, Object o2){
            player p1 = (player) o1;
            player p2 = (player) o2;

            return p1.getPoints().compareTo(p2.getPoints());
            }
        });.