Java：按值

Question

嘿，每个人都有对象存储多个整数值。我希望它按降序排序多次，一次按“Wins”值降序，另一次按“播放”值降序等等......我怎么能这样做？

Answer 1

以下是问题的示例代码

    public class MyObject  {
        private int wins;
        private int played;         
        // to do add getter and setter method for the above fields
    }

    List<MyObject> objects = new ArrayList<MyObject>();
    // to do java code for creating Myobjects

在Java 8之前：

// wins sorting
objects.sort(new Comparator<MyObject>() {
    @Override
    public int compare(MyObject m1, MyObject m2) {
        return m2.getWins() - m1.getWins();
     }
});

// Played sorting
objects.sort(new Comparator<MyObject>() {
    @Override
    public int compare(MyObject m1, MyObject m2) {
        return m2.getPlayed() - m1.getPlayed();
     }
});

Java 8代码：

objects.sort(Comparator.comparingInt(MyObject::wins) .reversed());
objects.sort(Comparator.comparingInt(MyObject::played) .reversed());