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DecimalFormat df = new DecimalFormat(",###.00");  
double aNumber = 33665448856.6568975; 
String result = df.format(aNumber);  
Sytem. out.println(result);

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33,665,448,856.66 
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StringTokenizer(String s) ¹¹ÔìÒ»¸ö·ÖÎöÆ÷£¬Ê¹ÓÃĬÈÏ·Ö¸ô×Ö·û£¨¿Õ¸ñ£¬»»ÐУ¬»Ø³µ£¬Tab£¬½øÖ½·û£© 
StringTokenizer(String s,String delim) delimÊÇ×Ô¼º¶¨ÒåµÄ·Ö¸ô·û 
nextToken() Öð¸ö»ñÈ¡×Ö·û´®ÖеÄÓïÑÔ·ûºÅ 
boolean hasMoreTokens() Ö»Òª×Ö·û´®»¹ÓÐÓïÑÔ·ûºÅ½«·µ»Øtrue£¬·ñÔò·µ»Øfalse 
countTokens() µÃµ½Ò»¹²ÓжàÉÙ¸öÓïÑÔ·ûºÅ
Êý×éµÄÑ¡ÔñÅÅÐò
public void ListNum(int[] a){  
  for(int k=0;k<a.length-1;k++){
  int j=k;  
  int mini=a[k];
  for(int i=k+1;i<a.length;i++){  
  if(a[k]>a[i]){
  a[k]=a[i];  
  j=i;
  }  
  }
  a[j]=mini;  
  }  
}
MD5ºÍÒ»¸ö¿ÉÄæ¼ÓÃÜËã·¨Ïà½ÓºÏµÄ¼ÓÃܺͽâÃܳÌÐò
import java.security.MessageDigest;
/**
*ÏÈͨ¹ýMD5¼ÓÃÜÖ®ºó£¬ÔÙÀ´Ò»´Î¿ÉÄæµÄ¼ÓÃÜ¡£
*˳Ðò¿ÉÒÔµ÷Õû£¬¿ÉÒÔÑ¡ÔñÏÈÓÿÉÄæ¼ÓÃÜ£¬È»ºóÔÙÓÃMD5¼ÓÃÜ
*/
public class MD5andKL{
//MD5¼ÓÂë¡£32λ
public static String MD5(String inStr) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];

for (int i = 0; i < charArray.length; i++)
byteArray[i] = (byte) charArray[i];

byte[] md5Bytes = md5.digest(byteArray);

StringBuffer hexValue = new StringBuffer();



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Java Excel API——JXLÈëÃÅ

 
JXL(Java Excel API)ÊÇÒ»¸öÓÃÀ´¶¯Ì¬¶ÁдExcelÎļþµÄ¿ªÔ´¿ò¼Ü£¬ÀûÓÃËü¿ÉÒÔÔÚÈκÎÖ§³ÖJavaµÄ²Ù×÷ϵͳÉ϶¯Ì¬¶ÁдExcelÎļþ¡£JXLµÄÖ÷Ò³ÊÇ£ºhttp://www.andykhan.com/jexcelapi/£¬¿ÉÒÔÔÚÕâÀïÏÂÔØµ½ËüµÄ×îеİ汾¡£
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java -jar jxl.jar -xml test.xls
java -jar jxl.jar -cvs test.xls
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JAVA »ñÈ¡±¾ÖܵįðʼÈÕÆÚ troy

import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
/**
 * @author troy(J2EE)
 * @version 1.0
 */
public class Test {
 public static void main(String[] args) throws Exception {
  DateFormat df = DateFormat.getDateInstance();
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¹ØÓÚ Java Concurrency
 
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¹Ø¼ü×Ö: µ×²ãÊý¾Ý Ãû´Ê½âÊÍ£º ²¹Â룺1 ÔÚ¼ÆËã»úϵͳÖУ¬ÊýÖµÒ»ÂÉÓв¹ÂëÀ´±íʾ(´æ´¢). ʹÓò¹Âë,¿ÉÒÔ½«·ûºÅλºÍÆäËûλͳһ´¦Àí;ͬʱ,¼õ·¨Ò²¿É°´¼Ó·¨À´´¦Àí.ÁíÍâ,Á½¸öÓò¹Âë±íʾµÄÊý¾ÝÏà¼Óʱºò,Èç¹û×î¸ßλ(·ûºÅλ)ÓнøÎ»,Ôò½øÎ¥±»ÉáÆú. 2 ²¹ÂëÓëÔ­ÂëµÄת»»¹ý³Ì¼¸ºõÊÇÏàͬµÄ ÊýÖµµÄ²¹Âë±íʾҲ·ÖÁ½ÖÖÇé¿ö£º £¨1£©ÕýÊýµÄ²¹Âë:ÓëÔ ......
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