Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

½âÎöJava¶ÔÏóµÄequals()ºÍhashCode()µÄʹÓÃ

ÔÚJavaÓïÑÔÖУ¬equals()ºÍhashCode()Á½¸öº¯ÊýµÄʹÓÃÊǽôÃÜÅäºÏµÄ£¬ÄãÒªÊÇ×Ô¼ºÉè¼ÆÆäÖÐÒ»¸ö£¬¾ÍÒªÉè¼ÆÁíÍâÒ»¸ö¡£ÔÚ¶àÊýÇé¿ö
Ï£¬ÕâÁ½¸öº¯ÊýÊDz»Óÿ¼Âǵģ¬Ö±½ÓʹÓÃËüÃǵÄĬÈÏÉè¼Æ¾Í¿ÉÒÔÁË¡£µ«ÊÇÔÚһЩÇé¿öÏ£¬ÕâÁ½¸öº¯Êý×îºÃÊÇ×Ô¼ºÉè¼Æ£¬²ÅÄÜÈ·±£Õû¸ö³ÌÐòµÄÕý³£ÔËÐС£×î³£¼ûµÄÊǵ±
Ò»¸ö¶ÔÏó±»¼ÓÈëÊÕ¼¯¶ÔÏó£¨collection
object£©Ê±£¬ÕâÁ½¸öº¯Êý±ØÐë×Ô¼ºÉè¼Æ¡£¸üϸ»¯µÄ¶¨ÒåÊÇ£ºÈç¹ûÄãÏ뽫һ¸ö¶ÔÏóA·ÅÈëÁíÒ»¸öÊÕ¼¯¶ÔÏóBÀ»òÕßʹÓÃÕâ¸ö¶ÔÏóAΪ²éÕÒÒ»¸öÔª¶ÔÏóÔÚÊÕ¼¯¶Ô
ÏóBÀïλÖõÄÔ¿³×£¬²¢Ö§³ÖÊÇ·ñÈÝÄÉ£¬É¾³ýÊÕ¼¯¶ÔÏóBÀïµÄÔª¶ÔÏóÕâÑùµÄ²Ù×÷£¬ÄÇô£¬equals()ºÍhashCode()º¯Êý±ØÐ뿪·¢Õß×Ô¼º¶¨Òå¡£ÆäËûÇé
¿öÏ£¬ÕâÁ½¸öº¯ÊýÊDz»ÐèÒª¶¨ÒåµÄ¡£
equals():
ËüÊÇÓÃÓÚ½øÐÐÁ½¸ö¶ÔÏóµÄ±È½ÏµÄ£¬ÊǶÔÏóÄÚÈݵıȽϣ¬µ±È»Ò²ÄÜÓÃÓÚ½øÐжÔÏó²ÎÔÄÖµµÄ±È½Ï¡£Ê²Ã´ÊǶÔÏó²ÎÔÄÖµµÄ±È½Ï£¿¾ÍÊÇÁ½¸ö²ÎÔıäÁ¿µÄÖµµÃ±È½Ï£¬ÎÒÃÇ
¶¼ÖªµÀ²ÎÔıäÁ¿µÄÖµÆäʵ¾ÍÊÇÒ»¸öÊý×Ö£¬Õâ¸öÊý×Ö¿ÉÒÔ¿´³ÉÊǼø±ð²»Í¬¶ÔÏóµÄ´úºÅ¡£Á½¸ö¶ÔÏó²ÎÔÄÖµµÄ±È½Ï£¬¾ÍÊÇÁ½¸öÊý×ֵıȽϣ¬Á½¸ö´úºÅµÄ±È½Ï¡£ÕâÖֱȽÏÊÇĬ
ÈϵĶÔÏó±È½Ï·½Ê½£¬ÔÚObjectÕâ¸ö¶ÔÏóÖУ¬ÕâÖÖ·½Ê½¾ÍÒѾ­Éè¼ÆºÃÁË¡£ËùÒÔÄãÒ²²»ÓÃ×Ô¼ºÀ´ÖØд£¬À˷Ѳ»±ØÒªµÄʱ¼ä¡£
¶ÔÏóÄÚÈݵıȽϲÅÊÇÉè¼Æequals()µÄÕæÕýÄ¿µÄ£¬JavaÓïÑÔ¶Ôequals()µÄÒªÇóÈçÏ£¬ÕâЩҪÇóÊDZØÐë×ñÑ­µÄ¡£·ñÔò£¬Äã¾Í²»¸ÃÀË·Ñʱ¼ä£º
¶Ô³ÆÐÔ£ºÈç¹ûx.equals(y)·µ»ØÊÇ“true”£¬ÄÇôy.equals(x)Ò²Ó¦¸Ã·µ»ØÊÇ“true”¡£
·´ÉäÐÔ£ºx.equals(x)±ØÐë·µ»ØÊÇ“true”¡£
ÀàÍÆÐÔ£ºÈç¹ûx.equals(y)·µ»ØÊÇ“true”£¬¶øÇÒy.equals(z)·µ»ØÊÇ“true”£¬ÄÇôz.equals(x)Ò²Ó¦¸Ã·µ»ØÊÇ“true”¡£
»¹ÓÐÒ»ÖÂÐÔ£ºÈç¹ûx.equals(y)·µ»ØÊÇ“true”£¬Ö»ÒªxºÍyÄÚÈÝÒ»Ö±²»±ä£¬²»¹ÜÄãÖظ´x.equals(y)¶àÉٴΣ¬·µ»Ø¶¼ÊÇ“true”¡£
ÈκÎÇé¿öÏ£¬x.equals(null)£¬ÓÀÔ¶·µ»ØÊÇ“false”£»x.equals(ºÍx²»Í¬ÀàÐ͵ĶÔÏó)ÓÀÔ¶·µ»ØÊÇ“false”¡£
hashCode():
Õâ
¸öº¯Êý·µ»ØµÄ¾ÍÊÇÒ»¸öÓÃÀ´½øÐкÕÏ£²Ù×÷µÄÕûÐÍ´úºÅ£¬Çë²»Òª°ÑÕâ¸ö´úºÅºÍÇ°ÃæËù˵µÄ²ÎÔıäÁ¿Ëù´ú±íµÄ´úºÅŪ»ìÁË¡£ºóÕß²»½ö½öÊǸö´úºÅ»¹¾ßÓÐÔÚÄÚ´æÖвŲéÕÒ¶Ô
ÏóµÄλÖõŦÄÜ¡£hashCode()Ëù·µ»ØµÄÖµÊÇÓÃÀ´·ÖÀà¶ÔÏóÔÚһЩÌض¨µÄÊÕ¼¯¶ÔÏóÖеÄλÖá£ÕâЩ¶ÔÏóÊÇHashMap, Hashtable,
HashSet£¬µÈµÈ¡£Õâ¸öº¯ÊýºÍÉÏÃæµÄequals()º¯Êý±ØÐë×Ô¼ºÉè¼Æ£¬ÓÃÀ´Ð­


Ïà¹ØÎĵµ£º

»ùÓÚjavaµÄ¿ªÔ´ÓÎÏ·ÒýÇæ

http://looframework.sourceforge.net/
http://robocode.sourceforge.net/
JAVA is DOOMED(JID)ÊÇÒ»¸öÀûÓÃJavaʵÏֵĿªÔ´3DÒýÇæ²¢ÇÒʹÓÃOpenGL×÷ΪͼÐÎAPI.
¿ª·¢ÓïÑÔ£º Java

ÏîÄ¿Ö÷Ò³£º http://javaisdoomed.sourceforge.net/
ÎĵµµØÖ·£º
ÏÂÔصØÖ·£º https://sourceforge.net/projects/javaisdoomed/
JMine ÊÇÒ» ......

javaÈÕÆÚ´¦Àí

 ×ª£º http://hi.baidu.com/jiong0818/blog/item/93f9b21641294b4d20a4e971.html JavaÖÐÈÕÆÚ¸ñʽת»» /** * ×Ö·û´®×ª»»Îªjava.util.Date
* Ö§³Ö¸ñʽΪ yyyy.MM.dd G 'at' hh:mm:ss z Èç '2002-1-1 AD at 22:10:59 PSD'
* yy/MM/dd HH:mm:ss Èç '2002/1/1 17:55:00'
* yy/MM/dd HH:mm:ss pm Èç '2002/1/1 17:55:00 p ......

jsp³£¼û´íÎójava.lang.ClassNotFoundException £­ 500

500´íÎó,classnotfoundÒì³££¬´úÂëûÓÐÎÊÌ⣬Êý¾Ý¿âҲûÎÊÌ⣬´òÁ˲¹¶¡£¬×°ÁËÇý¶¯£¬µ«ÊÇÔÚTOMCATÉÏÕÒ²»µ½ÄǸöÇý¶¯¶øÒý·¢µÄ´íÎ󡣡£¡£
½â¾ö°ì·¨£ºÊ×Ñ¡ÏîÉèÖÃÀMyRclipse->J2EE Project->Web Project->Deployment¹´ÉÏÄÇÈý¸öÇý¶¯¡£ ......

Java ¶ÁдExcelÎļþ £¨¶þ£©

JAVA EXCEL API¼ò½é
Java ExcelÊÇÒ»¿ª·ÅÔ´ÂëÏîÄ¿£¬Í¨¹ýËüJava¿ª·¢ÈËÔ±¿ÉÒÔ¶ÁÈ¡ExcelÎļþµÄÄÚÈÝ¡¢´´½¨ÐµÄExcelÎļþ¡¢¸üÐÂÒѾ­´æÔÚµÄExcelÎļþ¡£Ê¹ÓøÃAPI·ÇWindows²Ù×÷ϵͳҲ¿ÉÒÔͨ¹ý´¿JavaÓ¦ÓÃÀ´´¦ÀíExcelÊý¾Ý±í¡£ÒòΪÊÇʹÓÃJava±àдµÄ£¬ËùÒÔÎÒÃÇÔÚWebÓ¦ÓÃÖпÉÒÔͨ¹ýJSP¡¢ServletÀ´µ÷ÓÃAPIʵÏÖ¶ÔExcelÊý¾Ý±íµÄ·ÃÎÊ¡£
ÏÖÔ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ