Collections.sort对中文的排序

package lession;

import java.io.UnsupportedEncodingException;
import java.text.Collator;
import java.util.Comparator;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

class User {
 String name;
 int age;
 
 public User(String name,int age){
  this.name=name;
  this.age=age;
 }
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 } 
}

class ComparatorUser implements Comparator{
 Collator collator = Collator.getInstance(java.util.Locale.CHINA);
 public int compare(Object arg0, Object arg1) {
  User user0=(User)arg0;
  User user1=(User)arg1;
  String name0=toUTF_8(user0.getName());
  String name1=toUTF_8(user1.getName());
  int age0=user0.getAge();
  int age1=user1.getAge();
  //先比较名字再比较年龄
  int flag=collator.getCollationKey(name0).compareTo(collator.getCollationKey(name1));
  if(flag==0){
   return Integer.valueOf(age0).compareTo(Integer.valueOf(age1));
  }else{
   return flag;
  }  
 }
 private static String toUTF_8(String str) {
     try {
         return new String(str.getBytes(), "ISO-8859-1");
     } catch (UnsupportedEncodingException e) {
         e.printStackTrace();
         throw new RuntimeException(e);
     }
 }
}

public class SortTest {

 
 public static void main(String[] args){
  List userlist=new ArrayList();
  userlist.add(new User("吉斌",4));
  userlist.add(new User("何佳",1));
  userlist.add(new User("张哲",5));
  userlist.add(new User("段建波",6));  
  userlist.add(new User("邓斯奇",5));
  userlist.add(new User("邓斯奇",3));
  
  ComparatorUser comparator=new ComparatorUser();
  Collections.sort(userlist, comparator);
   
  for (int i=0;i<userlist.size();i++){
   User user_temp=(User)userlist.get(i);
      System.out.println(user_temp.getName()+","+user_temp.getAge()); 
  }
  
 }
}

上面的程序实现了，对中文的排序。

默认是根据字符串的ASCII/Unicode的编码排序的，若想按照汉字的拼音排序，需要把字符串转换编码为iso-8859-1.

如果你的文本是本地语言，而不是缺省语言，你需要传递一个本地语种给getInstance()方法