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<img src ="http://www.aygfsteel.com/elementkaka/aggbug/229218.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/elementkaka/" target="_blank">elmentkaka</a> 2008-09-16 17:48 <a href="http://www.aygfsteel.com/elementkaka/archive/2008/09/16/229218.html#Feedback" target="_blank" style="text-decoration:none;">å‘表评论</a></div>]]></description></item><item><title>一个计½Ž—机专业å¦ç”Ÿå‡ å¹´çš„ç¼–½E‹ç»éªŒæ±‡æ€?lt;如何å¦ä¹ java> (转自javaresearch.org)http://www.aygfsteel.com/elementkaka/archive/2008/09/10/228065.htmlelmentkakaelmentkakaWed, 10 Sep 2008 01:10:00 GMThttp://www.aygfsteel.com/elementkaka/archive/2008/09/10/228065.htmlhttp://www.aygfsteel.com/elementkaka/comments/228065.htmlhttp://www.aygfsteel.com/elementkaka/archive/2008/09/10/228065.html#Feedback0http://www.aygfsteel.com/elementkaka/comments/commentRss/228065.htmlhttp://www.aygfsteel.com/elementkaka/services/trackbacks/228065.html阅读全文
]]> - ½E‹åºå‘˜è‹±è¯çœŸçš„é‡è¦å—åQ?/title><link>http://www.aygfsteel.com/elementkaka/archive/2008/08/28/225395.html</link><dc:creator>elmentkaka</dc:creator><author>elmentkaka</author><pubDate>Thu, 28 Aug 2008 11:32:00 GMT</pubDate><guid>http://www.aygfsteel.com/elementkaka/archive/2008/08/28/225395.html</guid><wfw:comment>http://www.aygfsteel.com/elementkaka/comments/225395.html</wfw:comment><comments>http://www.aygfsteel.com/elementkaka/archive/2008/08/28/225395.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.aygfsteel.com/elementkaka/comments/commentRss/225395.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/elementkaka/services/trackbacks/225395.html</trackback:ping><description><![CDATA[½E‹åºå‘˜è‹±è¯çœŸçš„é‡è¦å—åQŸç¨‹åºå‘˜è‹Þp¯çœŸçš„é‡è¦å—？½E‹åºå‘˜è‹±è¯çœŸçš„é‡è¦å—åQ?
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]]> - Javaä¸å †å’Œæ ˆçš„区åˆ?è½?http://www.aygfsteel.com/elementkaka/archive/2008/08/13/221815.htmlelmentkakaelmentkakaWed, 13 Aug 2008 12:49:00 GMThttp://www.aygfsteel.com/elementkaka/archive/2008/08/13/221815.htmlhttp://www.aygfsteel.com/elementkaka/comments/221815.htmlhttp://www.aygfsteel.com/elementkaka/archive/2008/08/13/221815.html#Feedback0http://www.aygfsteel.com/elementkaka/comments/commentRss/221815.htmlhttp://www.aygfsteel.com/elementkaka/services/trackbacks/221815.html
æ ˆä¸Žå †éƒ½æ˜¯Java用æ¥åœ¨Ramä¸å˜æ”¾æ•°æ®çš„地方。与C++ä¸åŒåQŒJava自动½Ž¡ç†æ ˆå’Œå †ï¼Œ½E‹åºå‘˜ä¸èƒ½ç›´æŽ¥åœ°è®„¡½®æ ˆæˆ–å †ã€?
Javaçš„å †æ˜¯ä¸€ä¸ªè¿è¡Œæ—¶æ•°æ®åŒ?¾cÈš„对象从ä¸åˆ†é…½Iºé—´ã€‚这些对象通过newã€newarrayã€anewarrayå’Œmultianewarray½{‰æŒ‡ä»¤å¾ç«‹ï¼Œå®ƒä»¬ä¸éœ€è¦ç¨‹åºä»£ç æ¥æ˜‘Ö¼çš„é‡Šæ”¾ã€‚å †æ˜¯ç”±åžƒåœ¾å›žæ”¶æ¥è´Ÿè´£çš„åQŒå †çš„优势是å¯ä»¥åŠ¨æ€åœ°åˆ†é…内å˜å¤§å°åQŒç”Ÿå˜æœŸä¹Ÿä¸å¿…事先告诉编译器åQŒå› 为它是在˜q行时动æ€åˆ†é…内å˜çš„åQŒJava的垃圾收集器会自动收走这些ä¸å†ä‹É用的数æ®ã€‚但¾~ºç‚¹æ˜¯ï¼Œç”׃ºŽè¦åœ¨˜q行时动æ€åˆ†é…内å˜ï¼Œå˜å–速度较慢ã€?
æ ˆçš„ä¼˜åŠ¿æ˜¯ï¼Œå˜å–é€Ÿåº¦æ¯”å †è¦å¿«åQŒä»…‹Æ¡äºŽå¯„å˜å™¨ï¼Œæ ˆæ•°æ®å¯ä»¥å…±äº«ã€‚但¾~ºç‚¹æ˜¯ï¼Œå˜åœ¨æ ˆä¸çš„æ•°æ®å¤§ž®ä¸Žç”Ÿå˜æœŸå¿…™åÀL˜¯¼‹®å®šçš„，¾~ÞZ¹ç‰|´»æ€§ã€‚æ ˆä¸ä¸»è¦å˜æ”¾ä¸€äº›åŸºæœ¬ç±»åž‹çš„å˜é‡åQ?int, short, long, byte, float, double, boolean, charåQ‰å’Œå¯¹è±¡å¥æŸ„ã€?
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int a = 3;
int b = 3åQ?
¾~–译器先处ç†int a = 3åQ›é¦–å…ˆå®ƒä¼šåœ¨æ ˆä¸åˆ›å¾ä¸€ä¸ªå˜é‡äØ“a的引用，然åŽæŸ¥æ‰¾æ ˆä¸æ˜¯å¦æœ?˜q™ä¸ªå€û|¼Œå¦‚果没找刎ͼŒž®±å°†3å˜æ”¾˜q›æ¥åQŒç„¶åŽå°†a指å‘3。接ç€å¤„ç†int b = 3åQ›åœ¨åˆ›å¾å®Œb的引用å˜é‡åŽåQŒå› ä¸ºåœ¨æ ˆä¸å·²ç»æœ?˜q™ä¸ªå€û|¼Œä¾¿å°†b直接指å‘3。这æ øP¼Œž®±å‡ºçŽîCº†a与båŒæ—¶å‡æŒ‡å?的情å†üc€?
˜q™æ—¶åQŒå¦‚æžœå†ä»¤a=4åQ›é‚£ä¹ˆç¼–译器会é‡æ–°æœç´¢æ ˆä¸æ˜¯å¦æœ‰4å€û|¼Œå¦‚果没有åQŒåˆ™ž®?å˜æ”¾˜q›æ¥åQŒåƈ令a指å‘4åQ›å¦‚果已¾l有了，则直接将a指员q™ä¸ªåœ°å€ã€‚å› æ¤a值的改å˜ä¸ä¼šå½±å“到b的倹{€?
è¦æ³¨æ„è¿™¿Uæ•°æ®çš„å…׃ín与两个对象的引用åŒæ—¶æŒ‡å‘一个对象的˜q™ç§å…׃ín是ä¸åŒçš„åQŒå› ä¸ø™¿™¿U情况a的修改åƈä¸ä¼šå½±å“到b, 它是ç”Þq¼–译器完æˆçš„，它有利于节眽Iºé—´ã€‚而一个对象引用å˜é‡ä¿®æ”¹äº†˜q™ä¸ªå¯¹è±¡çš„内部状æ€ï¼Œä¼šåª„å“到å¦ä¸€ä¸ªå¯¹è±¡å¼•ç”¨å˜é‡ã€?
String是一个特ŒDŠçš„包装¾cÀL•°æ®ã€‚å¯ä»¥ç”¨åQ?
String str = new String("abc");
String str = "abc";
两ç§çš„åÅžå¼æ¥åˆ›å¾åQŒç¬¬ä¸€¿U是用new()æ¥æ–°å»ºå¯¹è±¡çš„åQŒå®ƒä¼šåœ¨å˜æ”¾äºŽå †ä¸ã€‚æ¯è°ƒç”¨ä¸€‹Æ¡å°±ä¼šåˆ›å»ÞZ¸€ä¸ªæ–°çš„对象。而第二ç§æ˜¯å…ˆåœ¨æ ˆä¸åˆ›å»ÞZ¸€ä¸ªå¯¹String¾cÈš„对象引用å˜é‡stråQŒç„¶åŽæŸ¥æ‰¾æ ˆä¸æœ‰æ²¡æœ‰å˜æ”¾"abc"åQŒå¦‚果没有，则将"abc"å˜æ”¾˜q›æ ˆåQŒåƈ令str指呔abc”åQŒå¦‚果已¾l有”abc” 则直接ä×ostr指呓abc”ã€?
比较¾c»é‡Œé¢çš„数值是å¦ç›¸½{‰æ—¶åQŒç”¨equals()æ–ÒŽ³•åQ›å½“‹¹‹è¯•ä¸¤ä¸ªåŒ…装¾cÈš„引用是å¦æŒ‡å‘åŒä¸€ä¸ªå¯¹è±¡æ—¶åQŒç”¨==åQŒä¸‹é¢ç”¨ä¾‹å说明上é¢çš„ç†è®ºã€?
String str1 = "abc";
String str2 = "abc";
System.out.println(str1==str2); //true
å¯ä»¥çœ‹å‡ºstr1å’Œstr2是指å‘åŒä¸€ä¸ªå¯¹è±¡çš„ã€?
String str1 =new String ("abc");
String str2 =new String ("abc");
System.out.println(str1==str2); // false
用newçš„æ–¹å¼æ˜¯ç”Ÿæˆä¸åŒçš„对象。æ¯ä¸€‹Æ¡ç”Ÿæˆä¸€ä¸ªã€?
å› æ¤ç”¨ç¬¬äºŒç§æ–¹å¼åˆ›å¾å¤šä¸ª”abc”å—符ä¸?在内å˜ä¸å…¶å®žåªå˜åœ¨ä¸€ä¸ªå¯¹è±¡è€Œå·². ˜q™ç§å†™æ³•æœ‰åˆ©ä¸ŽèŠ‚çœå†…å˜ç©ºé—? åŒæ—¶å®ƒå¯ä»¥åœ¨ä¸€å®šç¨‹åº¦ä¸Šæ高½E‹åºçš„è¿è¡Œé€Ÿåº¦åQŒå› 为JVMä¼šè‡ªåŠ¨æ ¹æ®æ ˆä¸æ•°æ®çš„实际情况æ¥å†³å®šæ˜¯å¦æœ‰å¿…è¦åˆ›å¾æ–°å¯¹è±¡ã€‚而对于String str = new String("abc")åQ›çš„代ç åQŒåˆ™ä¸€æ¦‚åœ¨å †ä¸åˆ›å¾æ–°å¯¹è±¡ï¼Œè€Œä¸½Ž¡å…¶å—符串值是å¦ç›¸½{‰ï¼Œæ˜¯å¦æœ‰å¿…è¦åˆ›å»ºæ–°å¯¹è±¡åQŒä»Žè€ŒåŠ é‡äº†½E‹åºçš„è´Ÿæ‹…ã€?
å¦ä¸€æ–šw¢, è¦æ³¨æ„? 我们在ä‹É用诸如String str = "abc"åQ›çš„æ ¼å¼å®šä¹‰¾cÀL—¶åQŒæ€ÀL˜¯æƒ›_½“然地认äØ“åQŒåˆ›å»ÞZº†String¾cÈš„对象str。担心陷阱ï¼å¯¹è±¡å¯èƒ½òq¶æ²¡æœ‰è¢«åˆ›å¾åQ而å¯èƒ½åªæ˜¯æŒ‡å‘一个先å‰å·²¾l创建的对象。åªæœ‰é€šè¿‡new()æ–ÒŽ³•æ‰èƒ½ä¿è¯æ¯æ¬¡éƒ½åˆ›å»ÞZ¸€ä¸ªæ–°çš„对象ã€?
ç”׃ºŽString¾cÈš„immutable性质åQŒå½“Stringå˜é‡éœ€è¦ç»å¸¸å˜æ¢å…¶å€¼æ—¶åQŒåº”该考虑使用StringBuffer¾c»ï¼Œä»¥æ高程åºæ•ˆçŽ‡ã€?
]]> - 接å£å’ŒæŠ½è±¡ç±»çš„区åˆ?/title><link>http://www.aygfsteel.com/elementkaka/archive/2008/08/10/221129.html</link><dc:creator>elmentkaka</dc:creator><author>elmentkaka</author><pubDate>Sun, 10 Aug 2008 06:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/elementkaka/archive/2008/08/10/221129.html</guid><wfw:comment>http://www.aygfsteel.com/elementkaka/comments/221129.html</wfw:comment><comments>http://www.aygfsteel.com/elementkaka/archive/2008/08/10/221129.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/elementkaka/comments/commentRss/221129.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/elementkaka/services/trackbacks/221129.html</trackback:ping><description><![CDATA[1.接å£æ›´é«˜å±‚次的抽象ã€?<br />
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