Java中对象按照属性排序

项目中经常需要用到比如地区列表按照中文的拼音首字母排序，但是有时候获取到的地区列表是对象的形式，有地区id，地区名称两个属性。这里主要涉及到两个技术点：

1、对象按属性排序；2、中文按拼音首字母排序。下面给出自己整理好的demo：

import java.text.Collator;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import org.apache.commons.beanutils.BeanComparator;import org.apache.commons.collections.ComparatorUtils;import org.apache.commons.collections.comparators.ComparableComparator;import org.apache.commons.collections.comparators.ComparatorChain;public class CompareTipA  {    private int  id;    private String  name;    private String age;    @SuppressWarnings("unchecked")public static void main(String []args) {        ArrayList<Object> list = new ArrayList<Object>();        list.add(new CompareTipA(1,"3","五"));        list.add(new CompareTipA(2,"1","六"));        list.add(new CompareTipA(5,"5","二"));        list.add(new CompareTipA(3,"4","四"));        list.add(new CompareTipA(8,"4","四"));        list.add(new CompareTipA(4,"2","一"));        Comparator mycmp = ComparableComparator.getInstance();        mycmp = ComparatorUtils.nullLowComparator(mycmp);  //允许null           mycmp = ComparatorUtils.reversedComparator(mycmp); //逆序                   ArrayList<Object> sortFields = new ArrayList<Object>();Comparator<Object> comparator=Collator.getInstance(java.util.Locale.CHINA);        sortFields.add(new BeanComparator("name",comparator));  //name正序 (主)        sortFields.add(new BeanComparator("id", mycmp));     //id逆序  (副)        ComparatorChain multiSort = new ComparatorChain(sortFields);        Collections.sort(list,multiSort);                for (int i =0;i<list.size();i++) {            System.out.println(list.get(i));    //输出/*         [id=5,name=二,age=5][id=2,name=六,age=1][id=8,name=四,age=4][id=3,name=四,age=4][id=1,name=五,age=3][id=4,name=一,age=2]*/        }    }    public CompareTipA(int id, String age,String name) {        this.id = id;        this.name = name;        this.age = age;    }    public int getId() {        return this.id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return this.name;    }    public void setName(String name) {        this.name = name;    }//    public int compareTo(Object o) {//        return this.comparator.compare(this, o);//    }    public String toString() {        return "[id=" + this.id + ",name=" + this.name +",age=" + this.age +"]";    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }} 

注意：需要导入的三个包：commons-beanutils-1.8.3.jar commons-collections-3.2.1.jar commons-logging-1.1.3.jar

commons-collections包不能用官网上的4.0版本，因为从源码中可以看见commons-beanutils包调用的就是commons-collections3.2版本的api，4.0的没兼容；commons-logging包也是commons-beanutils包所需要的。

下载地址：http://download.csdn.net/detail/djun100/6297353