1 public class Person { 2 String name; 3 int age; 4 public Person(String name, int age) { 5 this.name = name; 6 this.age = age; 7 } 8 public int getAge() { 9 return age; 10 } 11 public void setAge(int age) { 12 this.age = age; 13 } 14 public String getName() { 15 return name; 16 } 17 public void setName(String name) { 18 this.name = name; 19 } 20 } 21 import <a href="http://lib.csdn.net/base/17" class='replace_word' title="Java EE知识库" target='_blank' style='color:#df3434; font-weight:bold;'>Java</a>.util.Comparator; 22 public class Mycomparator implements Comparator{ 23 public int compare(Object o1,Object o2) { 24 Person p1=(Person)o1; 25 Person p2=(Person)o2; 26 if(p1.age<p2.age) 27 return 1; 28 else 29 return -1; 30 } 31 } 32 import java.util.ArrayList; 33 import java.util.Collections; 34 import java.util.Comparator; 35 public class ListSort { 36 public static void main(String[] args){ 37 ArrayList list = new ArrayList(); 38 list.add(new Person("lcl",28)); 39 list.add(new Person("fx",23)); 40 list.add(new Person("wqx",29)); 41 Comparator comp = new Mycomparator(); 42 Collections.sort(list,comp); 43 for(int i = 0;i<list.size();i++){ 44 Person p = (Person)list.get(i); 45 System.out.println(p.getName()); 46 } 47 } 48 }
看图，关键是定义一个比较器即可。