Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

JavaÏß³Ìͬ²½Ê¾Àý

ÎÄÕÂÓÃʵÀý´úÂëչʾÁËJavaÖжàÏ̷߳ÃÎʹ²Ïí×ÊÔ´
ʱÏß³Ìͬ²½
µÄÖØÒªÐÔ¡£
·Ö±ðͨ¹ýÔÚÁ½¸öÏß³ÌÖÐͬʱ·ÃÎÊ(µ÷ÓÃget_id*·½·¨)¾­¹ýͬ²½´¦Àí(lock¼°Synchronized)µÄ¹²Ïí×ÊÔ´(tmp)¼°Î´¾­¹ýͬ²½´¦ÀíµÄ¹²Ïí×ÊÔ´(tmp)À´ËµÃ÷ͬ²½´¦ÀíµÄµÄ×÷Óá£
mainÖзÖÁ½²¿·Ö:
1£©Ç°°ë²¿·Ö£¬non-synchronization²¿·ÖÓÃÀ´²âÊÔûÓÐ×öͬ²½´¦ÀíµÄ´úÂë¶Î£¬ÔËÐнá¹ûÓ¦¸ÃÊÇ
After thread #1 call get_id(), id=1
After thread #2 call get_id(), id=1
2£©ºó°ë²¿·Ö£¬synchronization²¿·ÖÓÃÀ´²âÊÔ×ö¹ýͬ²½´¦ÀíµÄ´úÂë¶Î£¬ÔËÐнá¹ûÓ¦¸ÃÊÇ
After thread #1 call get_id(), id=1
After thread #2 call get_id(), id=2
²Î¿¼×ÊÁÏ£º
-1-¹ØÓÚsleepºÍwaitÇø±ð¿´Ò»ÏÂÕâ¸ö: http://wurd.javaeye.com/blog/174563¡£
-2-¹ØÓÚsynchronized¿ÉÒÔ¿´Ò»ÏÂÕâÆª£ºhttp://www.wangchao.net.cn/bbsdetail_148670.html£¬±È½ÏÃ÷ÁË¡£
-3-¹ØÓÚJavaÏß³Ìͬ²½¿ÉÒÔ¿´Ò»ÏÂÕâ¸ö£ºhttp://lavasoft.blog.51cto.com/62575/27069£¬ºÜÏêϸ¡£
/********************************************************************************
*FileName: Thread_sync.java
*Date: 2010/01/12
*Intention: Test thread synchronization tools in java.
*Input:
*Output:
* in non-synchronization version
* After thread #1 call get_id(), id=1
* After thread #2 call get_id(), id=1
* in synchronization version
* After thread #1 call get_id(), id=1
* After thread #2 call get_id(), id=2
*
*DevelopmentEnv: Netbeans 6.8, Jdk 1.6.
********************************************************************************/
class Counter
{
private final static Object lock = new Object();
private static int count = 0;

public int get_id()
{
int tmp = count;
++tmp;
try
{
Thread.sleep(1000);
}
catch(Exception e)
{
}
count = tmp;

return count;
}
public int get_id_sync()
{
synchronized(lock)
{
int tmp = count;
++tmp;
try
{
Thread.sleep(1000);
}
catch(Exception e)
{
}
count = tmp;
}

return count;
}
}
public class Thread_sync
{
private static int cnt = 0;
static class Rab implements Runnable
{


Ïà¹ØÎĵµ£º

Java Web¿ª·¢Ïà¹ØÃû´Ê½âÊÍ

Web¿ª·¢Öо­³£Óõ½µÄһЩÃû´Ê£¬°´Í¬¹¦ÄÜÀàÐ͵ĽøÐзÖ×飺
1.±êÇ©£ºWebWork±êÇ©¡¢JSTL¡¢JSP±êÇ©
2.AOP À¹½ØÆ÷ ¹ýÂËÆ÷ ¼àÌýÆ÷ УÑéÆ÷
3.ÃæÏò½Ó¿Ú ÃæÏòÇÐÃæ ¿ØÖÆ·´×ª ÒÀÀµ×¢Èë
4.µ¥Ì¬Ä£Ê½ DAOģʽ ×°ÊÎģʽ
5.»º´æ£ºÊý¾Ý»º´æ ·þÎñÆ÷¶Ë»º´æ ¿Í»§¶Ë»º´æ
6.ORM EJB[ÈýÖÖBean]
7.JMS
8.MVC¿ª·¢Ä£Ê½
9.W ......

JAVAʵÏֵĴóÕûÊý¼Ó·¨

public class Test{ 
  public static String addBigNum(String str1,String str2){
     //ÕÒ³öÁ½×Ö·û´®µÄ³¤¶Ì£¬·½±ãºó±ßÒýÓã»
     String longer = str1.length() > str2.length()? str1 : str2;
     String shorter = str1.length( ......

java¸ßÊÖ֮·

Java Learning Path £¨Ò»£©¡¢¹¤¾ßƪ
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJDKÊÇSun¹«Ë¾·¢²¼µÄJDK£¬³ýÁËSunÖ®Í⣬ ......

java±¾¼Í

JavaÐéÄâ»úµÄÆðÔ´Óë¹¹Ôì
µ±ÎÒÃÇ˵µ½“Java”Õâ¸ö´ÊµÄʱºò£¬Ö¸µÄÊÇËĸöÏ໥¹ØÁªµÄ¸ÅÄJavaÓïÑÔ¡¢Java API¡¢Java ClassÎļþ¸ñʽ¡¢JavaÐéÄâ»ú¡£Õû¸öJavaÌåϵÊÇ»ùÓÚJava ÐéÄâ»ú¹¹ÔìµÄ£¬ÕýÒòΪÈç´Ë£¬²ÅÄÜʵÏÖJavaµÄ°²È«ÐÔºÍÍøÂçÒÆ¶¯ÐÔ¡£Java²¢·ÇÊǵÚÒ»¸ö²ÉÓÓÐéÄâ»ú”¸ÅÄîµÄÌåϵ£¬µ«È´ÊǵÚÒ»¸öµÃµ½¹ã·ºÔ ......

°³¾­ÀúµÄJavaÃæÊÔÌâÄ¿

ÌâÄ¿¶¼ºÜ¼òµ¥,µ«ÓÐʱºòÈÃÄãÓñÊÍêÕûµÄд³öÀ´È´²»ÄÇôÈÝÒ×ÁË.
1.±éÀúÎļþ¼Ð(±»Õâ¸öÌâÄ¿¿¼ÁËÁ½´Î)
import java.io.File;
public class ListFile {
public static void main(String[] args) {
// TODO Auto-generated method stub
String path = "C:/Inetpub";
File f = new File(path);
list(f);
}
publ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ