自定义规则，对List<Map<String,Object>> List<Object>进行排序

 package lltse.java.collection;

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;

 public class ListDemo {

     /**
      * @param args
      */
     public static void main(String[] args)
     {
         System.out.println("---------------开始-----------------------");
         List<Map<String, Object>> students = getSortStudentList();
         for(Map<String,Object> map:students)
         {
             System.out.println("Student:>>>"+map.get("Student"));
             System.out.println("distance:>>>"+map.get("distance"));
         }

         System.out.println("---------------分割线-----------------------");

         List<Object> persons =  getSortPerson();
         for(Object p :persons)
         {
             System.out.println("Person Name:>>>"+((Person)p).getName());
             System.out.println("Person Sex:>>>"+((Person)p).getSex());
             System.out.println("Person Age:>>>"+((Person)p).getAge());
         }
         System.out.println("---------------结束-----------------------");
     }

     /**
      * 对List中的对象按照距离进行排序
      * @return
      */
     public static List<Map<String, Object>> getSortStudentList()
     {
         List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
         Random rd = new Random(100);
         for (int i = 0; i < 5; i++)
         {
             Map<String, Object> map = new HashMap<String, Object>();
             map.put("Student", "Student" + i);
             map.put("distance", rd.nextDouble());

             list.add(map);
         }

         //Collections.synchronizedList(list);
         //自定义排序规则，进行排序
         Collections.sort(list, new Comparator<Map<String, Object>>()
             {
             @Override
             public int compare(Map<String, Object> o1, Map<String, Object> o2)
             {
                 Double d1 = (Double)o1.get("distance");
                 Double d2 = (Double)o2.get("distance");
                 return d1.compareTo(d2);
             }
         });

         return list;
     }

     /**
      * 引用外部比较器，将人员按年龄排序
      * @return
      */
     public static List<Object> getSortPerson()
     {
         List<Object> list = new ArrayList<Object>();
         Random rd = new Random();
         for(int s = 1;s <= 10; s++)
         {
             Person p = new Person();
             p.setAge(rd.nextInt(100));
             p.setName("Person"+s);
             String sex = "男";
             if(s % 2 > 0)
             {
                 sex = "女";
             }
             p.setSex(sex);

             list.add(p);
         }
         TestCompartor tc = new TestCompartor();
         Collections.sort(list, tc);

         return list;
     }
 }

 /**
  * 比较器类，按年龄升序排列
  * @author Administrator
  *
  */
 class TestCompartor implements Comparator<Object>
 {
     @Override
     public int compare(Object o1, Object o2) {

         Person p1 = (Person)o1;
         Person p2 = (Person)o2;
         if(p1.getAge()>p2.getAge())
         {
             return 1;
         }
         else
         {
             return -1;
         }
     }
 }

测试输出结果如下：

 ---------------开始-----------------------
 Student:>>>Student1
 distance:>>>0.19497605734770518
 Student:>>>Student4
 distance:>>>0.6186076060240648
 Student:>>>Student2
 distance:>>>0.6671595726539502
 Student:>>>Student0
 distance:>>>0.7220096548596434
 Student:>>>Student3
 distance:>>>0.7784408674101491
 ---------------分割线-----------------------
 Person Name:>>>Person8
 Person Sex:>>>男
 Person Age:>>>11
 Person Name:>>>Person7
 Person Sex:>>>女
 Person Age:>>>15
 Person Name:>>>Person6
 Person Sex:>>>男
 Person Age:>>>19
 Person Name:>>>Person10
 Person Sex:>>>男
 Person Age:>>>33
 Person Name:>>>Person4
 Person Sex:>>>男
 Person Age:>>>46
 Person Name:>>>Person9
 Person Sex:>>>女
 Person Age:>>>53
 Person Name:>>>Person3
 Person Sex:>>>女
 Person Age:>>>66
 Person Name:>>>Person5
 Person Sex:>>>女
 Person Age:>>>74
 Person Name:>>>Person2
 Person Sex:>>>男
 Person Age:>>>79
 Person Name:>>>Person1
 Person Sex:>>>女
 Person Age:>>>82
 ---------------结束-----------------------