java¼¼Êõ
£¨1£© Jbuilder£ºÒ»¸ö¿ÉÊÓµÄJava±à³Ì¹¤¾ß¡£
£¨2£© Eclipse£ºÒ»¸öÇ¿´óµÄJava±à³Ì¹¤¾ß¡£
£¨3£© HSQLDB£ºÊÇ´¿Java¿ª·¢µÄ¹ØÏµÐÍÊý¾Ý¿â,²¢ÌṩJDBCÇý¶¯´æÈ¡Êý¾Ý¡£
£¨4£© Mckoi DataBase£ºÊÇÓÉ´¿Java¿ª·¢µÄÊý¾Ý¿â¡£
£¨5£© ArgoUML£ºÊ¹ÓÃJava±àдµÄ¿ªÔ´UML²úÆ·¡£
£¨6£© Columba£ºÊÇ»ùÓÚJavaµÄE-mail¿Í»§¶Ë¡£
£¨7£© FreeCol£ºÒ»¸öJava¿ª·¢µÄÓÎÏ·£¬ÊÇÖ³ÃñµÛ¹úµÄÒ»¸ö¿ªÔ´°æ±¾¡£ËüÊÇÒ»¸öÀàËÆÓÚ²ßÂÔÓÎÏ·¡¶ÎÄÃ÷¡·ÐèÒªÍæ¼ÒÕ÷·þÐµİæÍ¼¡£
1£®Runtime.getRuntime().maxMemory()
µÃµ½ÐéÄâ»ú¿ÉÒÔ¿ØÖƵÄ×î´óÄÚ´æÊýÁ¿¡£
2£®Runtime.getRuntime().totalMemory()
µÃµ½ÐéÄâ»úµ±Ç°ÒÑʹÓõÄÄÚ´æÊýÁ¿¡£
£¨1£©ÐéÄâ»ú¿ÉÒÔ¿ØÖƵÄ×î´óÄÚ´æÊýÁ¿¾¹È»Ö»ÓÐ63MB£¬Ò²¾ÍÊÇ˵£¬ÉÔ΢²»ÁôÉñ¾Í»á·¢ÉúÄÚ´æÒç³ö¡£
£¨2£©ÔÚ²»¶ÏµØÏòStringÖÐ×·¼Ó×Ö·ûµÄÇé¿öÏ£¬ËùÕ¼ÓõÄÄÚ´æÔÚ²»¶ÏµÄÔö³¤
Ïà¹ØÎĵµ£º
Ò»¡¢
ʲôÊÇ
EL
£¿ÎªÊ²Ã´ÒªÊ¹ÓÃ
EL
£¿
EL
£¬¼´
JSP
±í´ïʽÓïÑÔ£¨
expression_r_r Language
£©£¬ËüÔÊÐíÎÒÃÇʹÓøü¼ò½à¡¢¸üÒ×¶Á¶®µÄÓï·¨À´È¡´úÄÑÒÔά»¤µÄ
Java
½Å±¾ÒÔ¼°±¿×¾µÄ
jsp:userBean,jsp:getProperty
£¬ËûÈÃÔÚ
JSP
ÖÐÍêÈ«Ïû³ýÁË
Java
´úÂë¡£
EL
µÄʹÓÃÄܹ»ÈÃ
JSP
Ò³Ãæ¸üÓпɶÁÐÔ£¬Êä³öµÄǶÌ×µÄ ......
¼ÇµÃÒ»Äêǰ£¬ÕýÊÇ×Ô¼º¶Ôjava°®²»ÊÍÊÖµÄʱºò£¬¶øÍøÉÏÒ²ÊÇÒ»²¨ÓÖÒ»²¨µÄjava³°·íÈÈ£¬ÎÒ·ßÅÁË£¬¾ÍÏñÈËÈ˶¼»áº´ÎÀ×Ô¼ºÏ²»¶µÄ¶«Î÷Ò»Ñù¡£ÎÒÔÚÄÚÍøÒ»´ÎÓÖÒ»´ÎµÄ·¢Ìû·¢Ð¹£¬¿ÉÄܰÓÚÎÒÊǰæÖ÷£¬javaÅúÅÐÕßÃÇҲûÓлØÌû¡£Ö±µ½ºóÀ´£¬´ó¼ÒÈÏʶÎÒ£¬¶¼ËµÂ··ÉºÜÉó¤java£¬javaºÜÀ÷º¦¡£ÆäʵÎÒÖ»¶ÔJ2SEÂÔ¶®Æ¤Ã«¡£ÎÒϲ»¶javaµÄÔÒòÊÇ£¬¶ÔÓÚÒ»¸ö ......
Ö±½ÓÑ¡ÔñÅÅÐòËã·¨£º´Ó´ýÅÅÐòµÄÊý¾ÝÔªËØ¼¯ºÏÖÐѡȡ×îСµÄÔªËØ·Åµ½ÔʼÊý¾ÝµÄµÚÒ»¸öÔªËØµÄλÖÃÉÏ¡£È»ºó²»°üÀ¨µÚÒ»¸öÔªËØµÄÊý¾ÝÔªËØ¼¯ºÏÖÐÕÒµ½×îСµÄÔªËØ·Åµ½´Ë¼¯ºÏÖУ¬ÒÀ´ÎÀàÍÆ£¬¼´¿ÉÍê³ÉÅÅÐò¡£
Ë㷨ʵÏÖÈçÏ£º
/**
* Ö±½ÓÑ¡ÔñÅÅÐò
* @param a ÓÃÓÚÅÅÐòµÄÊý×é
* */
public void ......
1¡¢ ¼Ì³ÐºÍʵÏÖÇø±ð
HashtableÊÇ»ùÓڳ¾ɵÄDictionaryÀàµÄ£¬HashMapÊÇJava 1.2Òý½øµÄMap½Ó¿ÚµÄÒ»¸öʵÏÖ¡£
2¡¢ Ḭ̈߳²È«²»Í¬
HashTableµÄ·½·¨ÊÇͬ²½µÄ£¬HashMapÊÇδͬ²½£¬ËùÒÔÔÚ¶àÏ̳߳¡ºÏÒªÊÖ¶¯Í¬²½HashMap¡£
3¡¢ ¶ÔnullµÄ´¦Àí²»Í¬
HashTable²»ÔÊÐínullÖµ(keyºÍvalue¶¼²»¿ÉÒÔ),HashMapÔÊÐín ......
Ò»¸ö²»¿É¸Ä±ä£¨immutable£©µÄÀ࣬¹ËÃû˼Ò壬¾ÍÊÇÆäʵÀý²»Äܸı䣬¼´ÀïÃæËùÓеÄÐÅÏ¢ÔÚ´´½¨Ê±¾Í¸³Öµ£¬ÔÚÆäÉúÃüÖÜÆÚÖÐÆäÖµ²»±ä¡£
ʹÓò»¿É¸Ä±äµÄÀàµÄÓŵãÔÚÓÚ£¬Éè¼Æ¼òµ¥£¬Ò×ÓÚʵÏÖºÍʹÓ㬾ßÌåÀ´½²£¬ËüµÄ״̬»úºÜ¼òµ¥£¬Ö»ÓÐÒ»¸ö״̬¡£ËüÊÇḬ̈߳²È«£¬Äܹ»×ÔÓɵı»¹²Ïí£¬Äܹ»Í¨¹ý¾²Ì¬¹¤³§Ä£Ê½¾¡¿ÉÄܸ´ÓÃÒѾ´´½¨³öÀ´µÄ¶ÔÏó£¬Ò²² ......