今天上水木发现有人问怎样对汉字字符串按照拼音排序，查了一遍文档，发现java缺省对字符串是按照Unicode排序的。接着查到（要是没有了Google，世界将会怎样？）有一个java.text.Collator类，但是论坛上有人说这个类没用，和缺省的排序效果一样，要用C#写一个类生成java程序。这要是真的，那还学java干嘛？
于是把别人的Test.java改了改，分别用指定的Locale和不指定Locale试了试，结果都是OK的：
import java.util.*;
import java.text.*;
public class Test2 {
public static void main(String args[]) {
//Comparator cmp = (RuleBasedCollator)java.text.Collator.getInstance(java.util.Locale.CHINA);//try testing various locales
Comparator cmp = java.text.Collator.getInstance(java.util.Locale.CHINA);//try testing various locales
String[] arr = {"ÕÂÈý", "Àï˹", "ÍõÎå", "Ñî¹óåú"};
java.util.Arrays.sort(arr, cmp);
for (int i = 0; i < arr.length; i++)
System.out.println(arr[i]);
Comparator cmp2 = java.text.Collator.getInstance();//try default locale
String[] arr2 = {"ÕÂÈý", "Àï˹", "ÍõÎå", "Ñî¹óåú"};
java.util.Arrays.sort(arr2, cmp2);
for (int i = 0; i < arr2.length; i++)
System.out.println(arr2[i]);
}
}
看来Java还不是那么查嘛。至于那位老兄，估计是缺省的Locale有问题。
下面是Jive上Gg到的对字符串中的字符按照拼音排序的测试代码：
import java.util.*;
import java.io.*;
import java.text.*;
public class CharSort implements Comparator{
java.text.RuleBasedCollator collator; // you can set your rules for the instance "collator"
CharSort(){
collator = (RuleBasedCollator)java.text.Collator.getInstance(java.util.Locale.CHINA);//try testing various locales
}
public void doSort(String str) throws java.io.IOException{
java.text.CollationKey[] keys = new java.text.CollationKey[str.length()];
for(int i=0;i<keys.length;i++){
keys[i] = collator.getCollationKey(str.substring(i,i+1));
}
java.util.Arrays.sort(keys, this);
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("cjk.txt"), "UTF8"));
for(int i=0;i<keys.length;i++){
bw.write(keys[i].getSourceString());
}
bw.newLine();
bw.close();
}
public int compare(Object c1, Object c2) throws IllegalArgumentException{
if((c1 instanceof CollationKey) &&(c2 instanceof CollationKey)){
return collator.compare(((CollationKey)c1).getSourceString(), ((CollationKey)c2).getSourceString());
}
else throw new IllegalArgumentException();
}
public boolean equals(Object c1, Object c2){
if(this.compare(c1,c2)==0) return true;
else return false;
}
public static void main(String[] args) throws java.lang.Exception{
CharSort chSort = new CharSort();
String str = " ÎÒ¾õµÃÎÒÍê³ÉÕâ¸öûÓõ½Ê²Ã´¹¤¾ß";
chSort.doSort(str);
//System.out.println(str);
String[] arr = {"ÕÂÈý", "Àï˹", "ÍõÎå"};
java.util.Arrays.sort(arr, new CharSort());
for (int i = 0; i < arr.length; i++)
System.out.println(arr[i]);
}
} 
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