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-----------------------