通过实现Comparator接口实现排序，

列子：一个Map 中建 key有name,age 字段，name为名字，age为年龄，现在根据年龄排序代码如下：@Test

public void testMapOrder() {

List> list = new ArrayList>();

Map map1 = new HashMap();

map1.put("name", "张三");//名字

map1.put("age", 22); //年龄

list.add(map1);

Map map3 = new HashMap();

map3.put("name", "王五");

map3.put("age", 38);

list.add(map3);

Map map5 = new HashMap();

map5.put("name", "谢七");

map5.put("age", 20);

list.add(map5);

Map map6 = new HashMap();

map6.put("name", "张三");

map6.put("age", 22);

list.add(map6);

//匿名实现Comparator接口进行排序

Collections.sort(list, new Comparator>() {

@Override

public int compare(Map o1, Map o2) {

//进行判断

return ((Integer)o1.get("age")).compareTo((Integer)o2.get("age"));

}

});

for(Map m:list){

System.out.println("Map[name="+m.get("name")+"age="+m.get("age")+"]");

}

}

结果：控制台打印

Map[name=谢七age=20]

Map[name=张三age=22]

Map[name=张三age=22]

Map[name=李四age=24]

Map[name=赵六age=36]

Map[name=王五age=38]