java实现字母的升序排列，和中文升序排列

1：字母的降序排列

package com.css.db;

import java.util.*;

public class Test2 {

public static void main(String[] args) {

Set set=new TreeSet(new Comparator(){

@Override

public int compare(Object o1, Object o2) {

// TODO Auto-generated method stub

String s1=(String)o1;

String s2=(String)o2;

return s2.compareTo(s1);

}

});

set.add("a");

set.add("j");

set.add("b");

set.add("d");

System.out.println(set);

}

}

2：中文升序排列

package com.css.dd;

import java.text.Collator;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

public class Test1 {

public static void main(String[] args) {

ArrayList list = new ArrayList();

list.add("中国");

list.add("美国");

list.add("加拿大");

list.add("阿富汗");

System.out.println(list);

Comparator cmp =Collator.getInstance(java.util.Locale.CHINA);

Collections.sort(list,cmp);

System.out.println(list);

}

}