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

javaʱ¼äº¯Êý

 http://blog.sina.com.cn/s/blog_503cf9f80100b9lf.html
javaʱ¼äº¯Êý(2008-12-06 22:25:46)
<> ±êÇ©£ºÔÓ̸ 
×¢Ò⣺java.utilºÍjava.sqlÖж¼ÓÐDateÕâ¸öÀ࣬²»ÖªµÀÓÃÄÄÒ»¸öÁË£¬Äã¿ÉÒÔдËÀjava.sql.Date time = .....
1. Java¼ÆËãʱ¼äÒÀ¿¿1970Äê1ÔÂ1ÈÕ¿ªÊ¼µÄºÁÃëÊý.                                                                                                                                                               
2. DateÀàµÄ¹¹Ô캯ÊýDate()·µ»Ø´ú±íµ±Ç°´´½¨µÄʱ¿ÌµÄ¶ÔÏó¡£DateµÄ·½·¨getTime()·µ»ØÒ»¸ölongÖµÔÚÊýÖµÉϵÈÓÚ1970Äê1ÔÂ1ÈÕ֮ǰ»òÖ®ºóµÄʱ¿Ì¡£
3. DateFormatÀàÓÃÀ´×ª»»Dateµ½String,·´Ö®ÒàÈ»¡£¾²Ì¬·½·¨getDateInstance()·µ»ØDateFormatµÄȱʡ¸ñʽ£»getDateInstance(DateFormat.FIELD)·µ»ØÖ¸¶¨µÄDateFormat¶ÔÏó¸ñʽ¡£Format(Date d)·½·¨·µ»ØString±íʾÈÕÆÚ£¬ÀýÈ磢January 1,2002.£¢·´¹ýÀ´£¬parse(String s)·½·¨·µ»ØÒÔ²ÎÊý×Ö·û´®±íʾµÄDate¶ÔÏó¡£
4. format()·½·¨·µ»ØµÄ×Ö·û´®¸ñʽ¸ù¾Ý²»Í¬µØÇøµÄʱ¼äÉèÖöøÓÐËù²»Í¬¡£
5. GregorianCalendearÀàÓÐÁ½¸öÖØÒªµÄ¹¹Ô캯Êý£ºGregorianCalerdar(),·µ»Ø´ú±íµ±Ç°´´½¨Ê±¼äµÄ¶ÔÏó£»GregorianCalendar(int year,int month,int date)·µ»Ø´ú±íÈÎÒâÈͮ򵀦ÔÏó¡£GregorianCalendarÀàµÄgetTime()·½·¨·µ»ØÈÕÆÚ¶ÔÏó¡£Add(int field,int amount)·½·¨Í¨¹ý¼Ó»ò¼õʱ¼äµ¥Î»£¬ÏóÌìÊý£¬ÔÂÊý»òÄêÊýÀ´¼ÆËãÈÕÆÚ¡£
Grego


Ïà¹ØÎĵµ£º

JavaдµÄ̰³ÔÉß

     ÈýÖÜǰ£¬¾ÍÓëͬѧԼ¶¨ºÃÁË£¬»¨ÈýÖÜʱ¼äд¸ö̰³ÔÉߣ¬¾ÍÓÃ×Ô¼ºÏÖÔÚËùѧµÄJava£¬ÎÒÏë¿ÉÒÔ°¡¡£Ñ§Ð£Àï½Ì²»³öʲô¶«Î÷£¬ÄǾÍ×Ô¼º¸ã°É£¡ÓÚÊÇÎÒÃÇÐÅÊĵ©µ©¿ªÊ¼Á˼¸Ìì¡£²»ÁÏÎåÒ»Ò»À´£¬°ÑËùÓеͼÀ­ÏÂÁË¡£×îºóÒ»ÖÜÁË£¬Ã»°ì·¨£¬Í¨Ïü°É£¡ÓÚÊÇÁ¬Ðø¼¸Ìì¿à¸É£¬ÖÕÓÚд³öÀ´ÁË.ËäÈ»Óеã´Ö²Ú£¬ÒòΪѧУ»¹Ã»¿ªÊ¼½ÌGUIº ......

´«ÖDz¥¿ÍJavaÅàѵ Servlet

ÔçÉÏÆð´²ÓеãÍíÁË£¬µ½Ñ§Ð£µÃʱºò¶¼8£º50ÁË£¬Ò»½ø½ÌÊÒ¿´¼ûÕÅТÏéÀÏʦÔÚ½ÌÊÒÀï¸øÍ¬Ñ§Ãǽâ¾öÎÊÌ⣬²»¼ûÁËÀϱϵÄÉíÓ°£¬»¹ÒÔΪ×ß´í½ÌÊÒÁËÄØ£¬°´Àí˵Õâ¸öʱºòÀϱÏÓ¦¸ÃÔçÀ´Á˲ÅÊÇ£¬Ò»ÎʲÅÖªµÀÊDZÏÀÏʦ²¡ÁË,È¥Ò½Ôº¼ì²éÈ¥ÁË£¬Ï£Íû±ÏÀÏʦÄÜÔçµãºÃÆðÀ´£¡
½ñÌìÊÇÕÅÀÏʦ¸øÎÒÃÇÉϿΣ¬ÉîÈëÆÊÎöservlet£¬ÔÚûÀ´´«ÖDz¥¿Í֮ǰ¿´¹ý²»ÉÙÒÔǰÕÅÀ ......

JAVAÓÅ»¯±à³Ì


java´úÂëÓÅ»¯±à³Ì
1.JVM ¹ÜÀíÁ½ÖÖÀàÐ͵ÄÄÚ´æ:¶ÑÄÚ´æ(heap),Õ»ÄÚ´æ(stack),¶ÑÄÚÔÚÖ÷ÒªÓÃÀ´´æ´¢³ÌÐòÔÚÔËÐÐʱ´´½¨»òʵÀý»¯µÄ¶ÔÏóÓë±äÁ¿.¶øÕ»ÄÚ´æÔòÊÇÓÃÀ´´æ´¢³ÌÐò´úÂëÖÐÉùÃ÷Ϊ¾²Ì¬(static)(»ò·Ç¾²Ì¬)µÄ·½·¨.
2.JVM ÖжÔÏóµÄÉúÃüÖÜÆÚ,´´½¨½×¶Î,Ó¦Óý׶Î,²»¿ÉÊÓ½×¶Î,²»¿Éµ½´ï½×¶Î,¿ÉÊÕ¼¯½×¶Î,ÖÕ½á½×
¶Î,ÊͷŽ׶Î
3.±ÜÃâÔÚÑ ......

Java ÔËËã·û×ܼÆ

1.ËãÊõÔËËã·û
    JavaµÄËãÊõÔËËã·û·ÖΪһԪÔËËã·ûºÍ¶þÔªÔËËã·û¡£Ò»ÔªÔËËã·ûÖ»ÓÐÒ»¸ö²Ù×÷Êý£»¶þÔªÔËËã·ûÓÐÁ½¸ö²Ù×÷Êý£¬ÔËËã·ûλÓÚÁ½¸ö²Ù×÷ÊýÖ®¼ä¡£ËãÊõÔËËã·ûµÄ²Ù×÷Êý±ØÐëÊÇÊýÖµÀàÐÍ¡£
    (1)Ò»ÔªÔËËã·û£º
    Ò»ÔªÔËËã·ûÓУºÕý£¨+£©¡¢¸º£¨£­£©¡¢¼Ó1£¨++£©ºÍ¼õ1£¨£­£­£ ......

java ËõÂÔͼ ʵÏÖ

import  java.awt.image. * ;
import  com.sun.image.codec.jpeg. * ;   
 public class poiReadDoc {
 Image img = null;
 int width = 0,height =0;
 String destFile = "";
 public void readImg(String fileName) throws IOException{
  File _fil ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ