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

Effective Java ѧϰ±Ê¼Ç (7)

Finalizer ²»¿É¼Æ»®µÄ,Ò²ÊÇΣÏÕµÄ,Ò»°ãÒ²ÊDz»±ØÒªµÄ. ²»ÄÜÔÚfinalizerÖзÅÈκÎÓëÒÀÀµÊ±¼äÏà¹ØµÄ²Ù×÷,ÒòΪÄã²»ÖªµÀËüʲôʱºò±»Ö´ÐÐ. ±ÈÈçÔÚfinalizerÖйرÕÎļþµÄ×ö·¨¾ÍÊÇ´íÎóµÄ, ¸ù¾ÝJVMµÄʵÏÖ·½Ê½²»Í¬,ÓпÉÄܵ¼Ö´ò¿ªµÄÎļþÊý¹ý¶à¶øÎÞ·¨ÔÙ´ò¿ªÎļþ. Ò²²»ÄÜÔÚfinalizerÖиıä״̬,Èç¸øÊý¾Ý¿â½âËøµÈ. finalizer»¹ÄÜ´øÀ´ÑÏÖØµÄÐÔÄÜÎÊÌâ, ÏÔʾµÄµ÷ÓõÄÖÕÖ¹º¯Êý¿ÉÒÔ²ÉÓÃtry -finallyµÄÓï¾ä µ±È»,ºÏ·¨µÄʹÓÃfinalizerÓÐÁ½ÖÖÇé¿ö: Ò»ÖÖÊÇ×öΪ×îºóµÄÒ»µÀ¹Ø¿¨,¼ì²âÓû§ÊÇ·ñÓÐûÓб»ÊͷŵÄ×ÊÔ´,Èç¹ûÓÐÔòÊÍ·ÅËü,²¢´òÓ¡³ö¾¯¸æ. ËäÈ»²»ÌᳫÔÚfinalizerÖÐÊÍ·Å×ÊÔ´,µ«ÍíÊÍ·Å×ܱȲ»ÊͷźÃ(beter later than never) »¹Ò»ÖֺϷ¨Ê¹ÓþÍÊÇÔÚʹÓà native·½·¨µÄʱºò. ҪעÒâ,finallizerûÓгм̹ØÏµ,ÔÚ×ÓÀàÖбØÐëÏÔʾµ÷Óø¸ÀàÖеĺ¯Êý.


Ïà¹ØÎĵµ£º

javaҹδÃß

          ×Ô´ÓѧϰJavaÒÔÀ´ÒѾ­Ò»ÄêÓÐÓàÁË£¬¶ÔJava»¹Ö»Êdzõ½×¶ÎµÄÁ˽⣬¶¼¹ÖÔÚѧУµÄʱºòÌ°ÍæÃ»ÓÐÓÐЧµÄÀûÓÃʱ¼ä£¬ÏÖÔÚÔÚÒ»¸öÅàѵѧУѧϰJava£¬ÏÖÔÚ¾ÍÒª×öÏîÄ¿ÁË»¹ÊÇʲô¶¼²»¶®£¬»¹ºÃÓÐCsdn¡£
      ÔÚCsdnµÄÈÕ×ÓÀï½ÐÎÒÕÒµ½Á˼ҵĸоõ£¬µÃµ½Á輆 ......

´«ÖDz¥¿Íjavaѧϰ sql¼òµ¥²éѯÓï¾ä

½ñÌìÎÒѧϰÁËsqlµÄ¼òµ¥²éѯÓï¾ä£¬
 
һЩ»ù±¾µÄ¸ÅÄ
1                  ϵͳȨÏÞ£ºÊý¾Ý¿âÖеĶÔÏó£¬ ±í£¬´´½¨±í£¬É¾³ý±í
2           ¶ÔÏóȨÏÞ£º¶ÔÊý¾ÝµÄÔö¡¢É¾¡¢¸Ä¡¢²é¡ ......

Effective Java ѧϰ±Ê¼Ç (6)

¼°Ê±Ïû³ý²»Ê¹ÓõĶÔÏóµÄÒýÓÃ, ÀíÂÛÉÏ, ´øÓÐÄÚ´æ¹ÜÀíµÄÓïÑÔÊDz»´æÔÚÄÚ´æÐ¹Â©µÄ, µ«ÊÇÈç¹û¶Ô¶ÔÏóµÄ²Ù×÷²»µ±,Ò²ÊÇ¿ÉÄÜ»áÔì³ÉÄÚ´æÐ¹Â©. ÈçÓÐÒ»¸östack, Æäpopº¯ÊýÈçÏÂ. public Object pop() {                if( Element.length() == 0) return nu ......

JavaÖеÄÊý¾Ý±È½Ï£¨ÔÙ̸==ÓëequalsµÄÇø±ð£©


±¾×÷Æ·²ÉÓÃ֪ʶ¹²ÏíÊðÃû-·ÇÉÌÒµÐÔʹÓÃ-Ïàͬ·½Ê½¹²Ïí 2.5 Öйú´ó½Ðí¿ÉЭÒé½øÐÐÐí¿É¡£
JavaÖеıäÁ¿Óë¶ÔÏóÓÐÇø±ðÂð£¿
Òý×Ó£º±äÁ¿Óë¶ÔÏó
±äÁ¿ÊÇJavaÖÐ×î»ù±¾µÄ´æ´¢µ¥Ôª£¬Îª±äÁ¿¸³Öµ¿ÉÒÔʹÓø³Öµ±í´ïʽ¡£È磺
int i = 10;
¸Ã±í´ïʽµÄº¬ÒåÊǽ«Ò»¸ö×ÖÃæÁ¿£¨literal£©10¸³Öµ¸øÒ»¸öÀàÐÍΪintÐ͵ıäÁ¿£¬±äÁ¿ÃûΪi¡£ÕâÊÇÒ»¸öÎ ......

Java Web¿ª·¢Ñ§Ï°±Ê¼ÇÖ®¶þ

1. doGet vs doPost
    Õâ¸öÎÊÌ⣬ÀÏʦ½²µÃ²»ÊǺÜÇåÎú£¬½ö½ö½²ÁËdoGetÊÇ¿ÉÒÔÈ¡³ö²ÎÊýÖµÔÚurlÖеIJÎÊý¡£ÒÔÏÂÄÚÈÝcopy×ÔÍøÂ磺
“getÖ»ÓÐÒ»¸öÁ÷£¬²ÎÊý¸½¼ÓÔÚurlºó£¬µØÖ·ÐÐÏÔʾҪ´«Ë͵ÄÐÅÏ¢£¬´óС¸öÊýÓÐÑϸñÏÞÖÆÇÒÖ»ÄÜÊÇ×Ö·û´®¡£
postµÄ²ÎÊýÊÇͨ¹ýÁíÍâµÄÁ÷´«µÝµÄ£¬ ²»Í¨¹ýurl£¬ËùÒÔ¿ÉÒԺܴó£¬Ò²¿ÉÒÔ´« ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ