java - 如何在Java中自定义Set的排序

Question

public static void main(String[] args) {
    // TODO Auto-generated method stub
    sortDates(Arrays.asList(new DAY[]{DAY.MON,DAY.WED,DAY.TUE,DAY.THU,DAY.SUN,DAY.SAT,DAY.FRI}));
}
public static void sortDates(List<DAY> dayList){
    Set<DAY> set = new TreeSet<DAY>(dayList);
    for(DAY day : set)
    {
        System.out.println(day);
    }
}
public enum DAY {
    MON("MONDAY"),TUE("TUESDAY"),WED("WEDNESDAY"),THU("THURSDAY"),FRI("FRIDAY"),SAT("SATURDAY"),SUN("SUNDAY");

    private String m_name;

    DAY(String name) {
        m_name=name;
    }
}

这段代码的输出是:周一治疗费用星期三周四弗瑞SAT太阳

但是我想要的输出是这样的太阳周一治疗费用星期三周四弗瑞SAT

这意味着我想自定义排序功能以将星期日移至第一个。

我该怎么做？提前致谢。

Answer 1

试试这个。

    import java.util.*;

public class SortDays {


     public static void main(String[] args) {
         // TODO Auto-generated method stub
         sortDates(Arrays.asList(new DAY[]{DAY.MON,DAY.WED,DAY.TUE,DAY.THU,DAY.SUN,DAY.SAT}));
     }
     public static void sortDates(List<DAY> dayList){
         Collections.sort(dayList, new Comparator<DAY>() {
                public int compare(DAY day1, DAY day2) {
                    return day1.getWeight() - day2.getWeight();
                }});
         System.out.println("sortedlist is" + dayList.toString());
     }



}

 enum DAY {
     MON("MONDAY", 2) ,TUE("TUESDAY", 3),WED("WEDNESDAY", 4),THU("THURSDAY", 5),FRI("FRIDAY", 6),SAT("SATURDAY", 7),SUN("SUNDAY", 1);

     private String m_name;
     private int m_weight;

     DAY(String name, int weight) {
         m_name=name;
         m_weight = weight;
     }

     public int getWeight() {
         return this.m_weight;
     }
 }