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

¡¾×ª¡¿Java³ÌÐòÐÔÄÜÓÅ»¯

Ò»¡¢±ÜÃâÔÚÑ­»·Ìõ¼þÖÐʹÓø´ÔÓ±í´ïʽ
ÔÚ²»×ö±àÒëÓÅ»¯µÄÇé¿öÏ£¬ÔÚÑ­»·ÖУ¬Ñ­»·Ìõ¼þ»á±»·´¸´¼ÆË㣬Èç¹û²»Ê¹Óø´ÔÓ±í´ïʽ£¬¶øÊ¹Ñ­»·Ìõ¼þÖµ²»±äµÄ»°£¬³ÌÐò½«»áÔËÐеĸü¿ì¡£
Àý×Ó£º
import java.util.Vector;
class CEL {
    void method (Vector vector) {
        for (int i = 0; i < vector.size (); i++)  // Violation
            ; // ...
    }
}
¸üÕý£º
class CEL_fixed {
    void method (Vector vector) {
        int size = vector.size ()
        for (int i = 0; i < size; i++)
            ; // ...
    }
}
¶þ¡¢Îª'Vectors' ºÍ 'Hashtables'¶¨Òå³õʼ´óС
JVMΪVectorÀ©³ä´óСµÄʱºòÐèÒªÖØÐ´´½¨Ò»¸ö¸ü´óµÄÊý×飬½«Ô­Ô­ÏÈÊý×éÖеÄÄÚÈݸ´ÖƹýÀ´£¬×îºó£¬Ô­ÏȵÄÊý×éÔÙ±»»ØÊÕ¡£¿É¼ûVectorÈÝÁ¿µÄÀ©´óÊÇÒ»¸öÆÄ·Ñʱ¼äµÄÊ¡£
ͨ³££¬Ä¬ÈϵÄ10¸öÔªËØ´óСÊDz»¹»µÄ¡£Äã×îºÃÄÜ׼ȷµÄ¹À¼ÆÄãËùÐèÒªµÄ×î¼Ñ´óС¡£
Àý×Ó£º
import java.util.Vector;
public class DIC {
    public void addObjects (Object[] o) {
        // if length > 10, Vector needs to expand
        for (int i = 0; i< o.length;i++) {   
            v.add(o);   // capacity before it can add more elements.
        }
    }
    public Vector v = new Vector();  // no initialCapacity.
}
¸üÕý£º
×Ô¼ºÉ趨³õʼ´óС¡£
    public Vector v = new Vector(20); 
    public Hashtable hash = new Hashtable(10);
²Î¿¼×ÊÁÏ£º
Dov Bulka, "Java Performance and Scalability Volume 1: Server-Side Programming
Techniques" Addison Wesley, ISBN: 0-201-70429-3 pp.55 – 57
Èý¡¢ÔÚfinally¿éÖйرÕStream
³ÌÐòÖÐʹÓ


Ïà¹ØÎĵµ£º

JAVA¹æÔò Öм¶Æª

±¾ÎĽéÉܵÄJAVA¹æÔòµÄ˵Ã÷·ÖΪ3¸öÖ÷Òª¼¶±ð£¬Öм¶ÊÇÆ½Ê±¿ª·¢ÓõıȽ϶àµÄ¼¶±ð£¬ÔÚ½ñºó½«Â½ÐøÐ´³öÆäËûµÄ¹æÔò¡£×ñÊØÁËÕâЩ¹æÔò¿ÉÒÔÌá¸ß³ÌÐòµÄЧÂÊ¡¢Ê¹´úÂëÓÖ¸üºÃµÄ¿É¶ÁÐԵȡ£
£¨1£©    ÔÚfinally·½·¨Àï¹Øµôinput»òÕßoutput ×ÊÔ´
ÔÙ·½·¨ÌåÀïÃæ¶¨ÒåÁËinput»òÕßoutputÁ÷µÄ»°£¬ÐèÒªÔÚfinallyÀïÃæ°ÑËü¹Øµô¡£
ÒÔÏÂ ......

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 ......

ÈÃÎÒÒ»¼ûÖÓÇéµÄjava web mvc ¿ò¼Ü£ºVraptor3

ǰ¶Îʱ¼ä¹«Ë¾¿ªÊ¼ÓÃSSH¿ò¼Ü£¬ÒòΪÒÔǰûÓÐÓùý£¬Ï¸ö¼¸¸ödemo¿´¿´£¬·¢ÏÖÏëÀí½âStructs2µÄÁ÷³ÌÕæÊÇÀ§ÄÑ£»ºóÀ´ÓÖÏëÕûºÏExt½øÐнçÃæ¿ª·¢£¬ÉÏÍøÕÒ×ÊÁÏ£¬·¢ÏÖÓÃStructsÕûºÏAjax»¹ÕæÊÇÂé·³£¬²»½öǰ̨Ҫ×öÐ޸ģ¬ºǫ́»¹Òª¸ÄÅäÖÃÎļþÒÔ¼°actionÀà£¬Õæ²»ÖªµÀÕâÑùµÄ¶«Î÷×öÍêÁ˸ÃÔõôÑùȥά»¤£¡¼ÌÐøÔÚÍøÉÏÕÒÖÕÓÚ±»ÎÒ·¢ÏÖÁËVraptor£¬¸Ã¿ò ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ