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

javaÖеÄSystem.currentTimeMillis()º¯Êý

System.currentTimeMillis()£º¿ÉÒÔÌáÈ¡µ½µ±Ç°Ê±¼äµÄºÁÃëÊý£¬²úÉúÒ»¸öµ±Ç°µÄºÁÃ룬Õâ¸öºÁÃëÆäʵ¾ÍÊÇ×Ô1970Äê1ÔÂ1ÈÕ0ʱÆðµÄºÁÃëÊý¡£
³£¼û×÷ÓãºÒ»°ã¶¼ÊÇÓÃ2¸öʱ¼äµÄ²îÖµÀ´µÃµ½ÔËÐÐʱ¼äµÄ£¬³£ÓÃÀ´±È½Ï2¸öËã·¨µÄЧÂÊ£¡
long start = System.currentTimeMillis();
  // ÕâÀï¿ÉÒÔ¼ÓÉÏÄãÒªÖªµÀµÄ·½·¨ÔËÐеÄʱ¼ä£¡£¡
 
long end = System.currentTimeMillis();
System.out.println("ÔËÐÐʱ¼ä£º"+(end - start));
¸ñʽ»¯System.currentTimeMillis()
 1 import java.text.SimpleDateFormat;
 2 import java.util.Locale;
 3 
 4 
 5 public class FormatCurrentTime {
 6     /**
 7      * @param args
 8      */
 9     public static void main(String[] args) {
10         
11         SimpleDateFormat sdf = new SimpleDateFormat("", Locale.SIMPLIFIED_CHINESE);
12         sdf.applyPattern("yyyyÄêMMÔÂddÈÕ HHʱmm·ÖssÃë");
13         System.out.println(sdf.format(System.currentTimeMillis()));
14         
15     }
16 }
17 
 


Ïà¹ØÎĵµ£º

Java Web¿ª·¢£¬ÄãÒ»¶¨»áÓöµ½

Java Web¿ª·¢ÖУ¬ÓÐÐí¶à¹²Í¨µÄÎÊÌ⣬ÊÇ¿ª·¢ÈËÔ±ÔÚ¿ª·¢¹ý³ÌÖÐÒ»¶¨»áÓöµ½µÄ£¬ÐèÒª´¦ÀíµÄÎÊÌ⣺
1.  ÂÒÂëÎÊÌâ
ΪºÎ»á³öÏÖÂÒÂëÎÊÌ⣿¼ÈÈ»ÓÐÂÒÂëÎÊÌ⣬¿Ï¶¨ÊÇÓÉÓÚ±àÂëÉèÖõIJ»Ò»Öµ¼Öµġ£ÔÚWeb¿ª·¢
¹ý³ÌÖУ¬Éæ¼°ÒÔÏÂһЩ±àÂëÉèÖ㬿ͻ§¶Ë²ÎÊýµÄ±àÂëÉèÖã¬Web·þÎñÆ÷µÄ±àÂëÉèÖ㬷þÎñÆ÷¶ËÓ¦ÓóÌÐòµÄ±àÂëÉèÖã¬Êý¾Ý¿â ......

oracleµ÷ÓÃjavaÀà±éÀú´ÅÅÌÎļþ

ÀûÓÃoracle×Ô´øµÄutl_file°ü¿ÉÒÔ·ÃÎÊ´ÅÅÌÎļþ£¬µ«ÓиöÏÞÖÆ--ÎÞ·¨·ÃÎÊÎļþ¼Ð£¿Ê²Ã´ÒâË¼ÄØ£¿¾ÍÊÇ˵oracleÖ»ÄÜ·ÃÎÊÖ¸¶¨µÄÎļþ£¬¶ø²»ÄÜ·ÃÎÊÎļþ¼ÐϵÄδ֪Îļþ¡£ËùÒÔ£¬Èç¹ûҪͨ¹ýoracleÈ¥±éÀúijָ¶¨Â·¾¶ÏµÄËùÓÐÎļþ£¬sorry, impossible! µ«ÊÇ£¬ÓÐÒ»ÖÖÌæ´ú·½°¸¿ÉÒÔÖúÄãÒ»±ÛÖ®Á¦£¡
ÖÚËùÖÜÖªjavaÖ®FileÀàÖ¸ÏòµÄ¿ÉÒÔÊÇĿ¼Ҳ¿ÉÒÔÊ ......

java±à³Ì˼Ïë¶ÁÊé±Ê¼Ç

¶ÔÏó¾ßÓÐ״̬,ÐÐΪ,±êʶ.¶ÔÏóµÄÎå¸ö»ù±¾ÌØÐÔ:
    ÍòÎï½Ô¶ÔÏó,³éÈ¡´ýÇó½âÎÊÌâµÄÈκθÅÄ¹¹¼þ,½«Æä±íʾΪ³ÌÐòÖеĶÔÏó
    ³ÌÐòÊǶÔÏóµÄ¼¯ºÏ,ËûÃÇͨ¹ý·¢ËÍÏûÏ¢À´¸æÖª±Ë´ËËùÒª×öµÄ
    Ã¿¸ö¶ÔÏó¶¼ÓÐ×Ô¼ºµÄÓÉÆäËû¶ÔÏóËù¹¹³ÉµÄ´æ´¢,´´½¨°üº¬ËùÓжÔÏóµÄ°üµ ......

JavaÖеÄvolatile¹Ø¼ü×Ö

ÎÒÃÇÖªµÀ£¬ÔÚJavaÖÐÉèÖñäÁ¿ÖµµÄ²Ù×÷£¬³ýÁËlongºÍdoubleÀàÐ͵ıäÁ¿Íâ¶¼ÊÇÔ­×Ó²Ù×÷£¬Ò²¾ÍÊÇ˵£¬¶ÔÓÚ±äÁ¿ÖµµÄ¼òµ¥¶Áд²Ù×÷ûÓбØÒª½øÐÐͬ²½¡£
ÕâÔÚJVM 1.2֮ǰ£¬JavaµÄÄÚ´æÄ£ÐÍʵÏÖ×ÜÊÇ´ÓÖ÷´æ¶ÁÈ¡±äÁ¿£¬ÊDz»ÐèÒª½øÐÐÌØ±ðµÄ×¢ÒâµÄ¡£¶øËæ×ÅJVMµÄ³ÉÊìºÍÓÅ»¯£¬ÏÖÔÚÔÚ¶àÏ̻߳·¾³ÏÂ
volatile¹Ø¼ü×ÖµÄʹÓñäµÃ·Ç³£ÖØÒª¡£ÔÚµ±Ç°µÄ ......

ubntuÏÂjavaÖÐÎÄÂÒÂë½â¾ö

cd /usr/lib/jvm/java
-1.5.0-sun-1.5.0.15/jre/lib/fonts
sudo mkdir fallback
cd fallback
sudo cp /usr/share/fonts/truetype/arphic/uming.ttc /usr/lib/jvm/java
-1.5.0-sun-1.5.0.15/jre/lib/fonts/fallback
sudo mkfontdir
sudo mkfontscale ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ