Java中对list map根据map某个key值进行排序的方法

实例如下所示：

package test;

import java.util.arraylist;

import java.util.collections;
import java.util.comparator;
import java.util.hashmap;
import java.util.list;
import java.util.map;

public class java_listmapsort {
  public static void main(string[] args) {
    // todo auto-generated method stub
    list<map<string, object>> list = new arraylist<map<string, object>>();
    map<string, object> map1 = new hashmap<string, object>();
    map1.put("name", "p");
    map1.put("cj", "5");
    map<string, object> map2 = new hashmap<string, object>();
    map2.put("name", "h");
    map2.put("cj", "12");
    map<string, object> map3 = new hashmap<string, object>();
    map3.put("name", "f");
    map3.put("cj", "31");
    list.add(map1);
    list.add(map3);
    list.add(map2);
    //排序前
    for (map<string, object> map : list) {
      system.out.println(map.get("cj"));
    }
    collections.sort(list, new comparator<map<string, object>>() {
      public int compare(map<string, object> o1, map<string, object> o2) {
        integer name1 = integer.valueof(o1.get("cj").tostring()) ;//name1是从你list里面拿出来的一个
        integer name2 = integer.valueof(o2.get("cj").tostring()) ; //name1是从你list里面拿出来的第二个name
        return name1.compareto(name2);
      }
    });
    //排序后
    system.out.println("-------------------");
    for (map<string, object> map : list) {
      system.out.println(map.get("cj"));
    }
  }
}

以上这篇java中对list map根据map某个key值进行排序的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/wo88798/article/details/78342640