java集合中对象排序

概述：本示例实现对象按年龄升序 人气升序排序功能   姓名升序 降序排序功能
package ch02;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
 * @author YaoShiyou 实现对象排序
 *
 */
public class Person {
 // 姓名
 private String name;
 // 年龄
 private int age;
 // 人气
 private int hobby;
 public Person(String name) {
  this.name = name;
 }
 public Person(String name, int age) {
  this(name);
  this.age = age;
 }
 public Person(String name, int age, int hobby) {
  this(name, age);
  this.hobby = hobby;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
 public int getHobby() {
  return hobby;
 }
 public void setHobby(int hobby) {
  this.hobby = hobby;
 }
 public static void main(String[] args) {
  List<Person> list = new ArrayList<Person>();
  list.add(new Person("g1", 18, 122));
  list.add(new Person("g2", 17, 244));
  list.add(new Person("g3", 45, 243));
  list.add(new Person("g4", 9, 67));
  list.add(new Person("g5", 98, 2));
  System.out.println("排序前---");
  for (Person person : list) {
   System.out.println(person.getName() + "\t" + person.getAge() + "\t"
     + person.getHobby());
  }
  // Collections调用sort 方法 参数为
  Collections.sort(list, new AgeComparatorAsc());
  System.out.println("年龄排序后----");
  for (Person person : list) {