java¾µäÃæÊÔÌâ
java¾µäÃæÊÔÌâ ÊÕ²Ø
Java»ù´¡·½Ãæ:
0¡¢×÷ÓÃÓòpublic,private,protected,ÒÔ¼°²»Ð´Ê±µÄÇø±ð
´ð£ºÇø±ðÈçÏ£º
×÷ÓÃÓò µ±Ç°Àà ͬһpackage ×ÓËïÀà ÆäËûpackage
public √ √ √ √
protected √ √ √ ×
friendly √ √ × ×
private √ × × ×
²»Ð´Ê±Ä¬ÈÏΪfriendly
1¡£
java.lang.StringÀàÊÇfinalÀàÐ͵ģ¬Òò´Ë²»¿ÉÒԼ̳ÐÕâ¸öÀà¡¢²»ÄÜÐÞ¸ÄÕâ¸öÀࡣΪÁËÌá¸ßЧÂʽÚÊ¡¿Õ¼ä£¬ÎÒÃÇÓ¦¸ÃÓÃStringBufferÀà
3¡¢int ºÍ Integer ÓÐÊ²Ã´Çø±ð
Java ÌṩÁ½ÖÖ²»Í¬µÄÀàÐÍ£ºÒýÓÃÀàÐͺÍÔʼÀàÐÍ£¨»òÄÚÖÃÀàÐÍ£©¡£IntÊÇjavaµÄÔʼÊý¾ÝÀàÐÍ£¬IntegerÊÇjavaΪintÌṩµÄ·â×°Àà¡£JavaΪÿ¸öÔʼÀàÐÍÌṩÁË·â×°Àà¡£
ÔʼÀàÐÍ·â×°Àà
booleanBoolean
charCharacter
byteByte
shortShort
intInteger
longLong
floatFloat
doubleDouble
Òý ÓÃÀàÐͺÍÔʼÀàÐ͵ÄÐÐΪÍêÈ«²»Í¬£¬²¢ÇÒËüÃǾßÓв»Í¬µÄÓïÒå¡£ÒýÓÃÀàÐͺÍÔʼÀàÐ;ßÓв»Í¬µÄÌØÕ÷ºÍÓ÷¨£¬ËüÃǰüÀ¨£º´óСºÍËÙ¶ÈÎÊÌ⣬ÕâÖÖÀàÐÍÒÔÄÄÖÖÀàÐ͵ÄÊý ¾Ý½á¹¹´æ´¢£¬µ±ÒýÓÃÀàÐͺÍÔʼÀàÐÍÓÃ×÷ij¸öÀàµÄʵÀýÊý¾ÝʱËùÖ¸¶¨µÄȱʡֵ¡£¶ÔÏóÒýÓÃʵÀý±äÁ¿µÄȱʡֵΪ null£¬¶øÔʼÀàÐÍʵÀý±äÁ¿µÄȱʡֵÓëËüÃǵÄÀàÐÍÓйء£
4¡¢String ºÍStringBufferµÄÇø±ð
JAVA ƽ̨ÌṩÁËÁ½¸öÀࣺStringºÍStringBuffer£¬ËüÃÇ¿ÉÒÔ´¢´æºÍ²Ù×÷×Ö·û´®£¬¼´°üº¬¶à¸ö×Ö·ûµÄ×Ö·ûÊý¾Ý¡£Õâ¸öStringÀàÌṩÁËÊýÖµ²»¿É¸Ä ±äµÄ×Ö·û´®¡£¶øÕâ¸öStringBufferÀàÌṩµÄ×Ö·û´®½øÐÐÐ޸ġ£µ±ÄãÖªµÀ×Ö·ûÊý¾ÝÒª¸Ä±äµÄʱºòÄã¾Í¿ÉÒÔʹÓÃStringBuffer¡£µäÐ͵أ¬Äã¿É ÒÔʹÓÃStringBuffersÀ´¶¯Ì¬¹¹Ôì×Ö·ûÊý¾Ý¡£
5¡¢ÔËÐÐʱÒì³£ÓëÒ»°ãÒì³£ÓкÎÒìͬ£¿
Òì³£±íʾ³ÌÐòÔËÐйý³ÌÖпÉÄܳöÏֵķÇÕý³£×´Ì¬£¬ÔËÐÐʱÒì³£±íʾÐéÄâ»úµÄͨ³£²Ù×÷ÖпÉÄÜÓöµ½µÄÒì³££¬ÊÇÒ»ÖÖ³£¼ûÔËÐдíÎó¡£java±àÒëÆ÷ÒªÇó·½·¨±ØÐëÉùÃ÷Å׳ö¿ÉÄÜ·¢ÉúµÄ·ÇÔËÐÐʱÒì³££¬µ«ÊDz¢²»ÒªÇó±ØÐëÉùÃ÷Å׳öδ±»²¶»ñµÄÔËÐÐʱÒì³£¡£
6¡¢Ëµ³öServletµÄÉúÃüÖÜÆÚ£¬²¢Ëµ³öServletºÍCGIµÄÇø±ð¡£
Servlet±»·þÎñÆ÷ʵÀý»¯ºó£¬ÈÝÆ÷ÔËÐÐÆäinit·½·¨£¬ÇëÇóµ½´ïʱÔËÐÐÆäservice·½·¨£¬service·½·¨×Ô¶¯ÅÉDzÔËÐÐÓëÇëÇó¶ÔÓ¦µÄdoXXX·½·¨£¨doGet£¬doPost£©µÈ£¬µ±·þÎñÆ÷¾ö¶¨½«ÊµÀýÏú»ÙµÄʱºòµ÷ÓÃÆädestroy·½·¨¡£
ÓëcgiµÄÇø±ðÔÚÓÚservlet´¦ÓÚ·þÎñÆ÷½ø³ÌÖУ¬Ëüͨ¹ý¶àÏ̷߳½Ê½ÔËÐÐÆäservice·½·¨£¬Ò»¸öʵÀý¿ÉÒÔ·þÎñÓÚ¶à¸öÇëÇ󣬲¢ÇÒÆäʵÀýÒ»°ã²»»áÏú»Ù£¬¶øCGI
Ïà¹ØÎĵµ£º
¶ÔÓÚÒ»¸öʵÏÖÁËComparable½Ó¿ÚµÄ¶ÔÏ󣬸ýӿÚÖ»ÄÜʵÏÖÒ»´Î¡£Èç¹ûÔÚÒ»¸ö¼¯ºÏÀïÃæÐèҪʹÓÃidÅÅÐò£¬¶øÔÚÁíÍâÒ»¸ö¼¯ºÏÀïÐèÒª°´Ãû×ÖÅÅÐòÕâʱ¾ÍÐèÒªÔÚÕâ¸ö¼¯ºÏÀïÃæÖ¸¶¨±È½ÏÆ÷¡£
Comparable½Ó¿ÚÉùÃ÷ÁËcompareTo(Object o)·½·¨
Comparator ½Ó¿ÚÉùÃ÷ÁËcompare(Object o1,Object o2)·½·¨
eg:
µÚÒ»¸öÊ÷¼¯Êǰ´ÕÕ¶ÔÏóĬÈϵÄidÅÅÐò£¬µ ......
¡¶javaÓïÑÔ³ÌÐòÉè¼Æ£¨Ò»£©¡·2009Äê×Ôѧ¿¼ÊÔ´ó¸ÙµÚ1ÕÂ
www.wesiedu.com 2009-5-5 ÔÚÏßÄ£Ä⿼³¡
¶þ¡¢¿Î³ÌÄÚÈÝÓ뿼ºËÄ¿±ê
µÚ1Õ JavaÓïÑÔ»ù´¡
(Ò»)¿Î³ÌÄÚÈÝ
1.1 JavaÓïÑÔµÄÌØµã
1.2 JavaÓ¦ÓóÌÐòºÍСӦÓóÌÐò
1.3 Java³ÌÐòµÄ¿ª·¢¹ý³Ì
1.4±êʶ·ûºÍ¹Ø¼ü×Ö
l.5»ù±¾Êý¾ÝÀàÐÍ
1.5.1 Âß¼ÀàÐÍ
1 ......
¡¶javaÓïÑÔ³ÌÐòÉè¼Æ£¨Ò»£©¡·2009Äê×Ôѧ¿¼ÊÔ´ó¸ÙµÚ3ÕÂ
www.wesiedu.com 2009-5-5 ÔÚÏßÄ£Ä⿼³¡
µÚ3ÕÂ ÃæÏò¶ÔÏó±à³Ì»ù´¡
(Ò»)¿Î³ÌÄÚÈÝ
3.1 ÃæÏò¶ÔÏóµÄ»ù±¾¸ÅÄî
3.2 JavaµÄÀàºÍ¶ÔÏó
3.2.1 Àà
3.2.2¶ÔÏó
3.2.3ʵÀý±äÁ¿ºÍÀà±äÁ¿
3.2.4ʵÀý·½·¨ºÍÀà·½·¨
3.2.5·ÃÎÊȨÏÞ
3.2.6¼Ì³Ð
3.2.7 Java ......
¡¶javaÓïÑÔ³ÌÐòÉè¼Æ£¨Ò»£©¡·2009Äê×Ôѧ¿¼ÊÔ´ó¸ÙµÚ6ÕÂ
www.wesiedu.com 2009-5-5 ÔÚÏßÄ£Ä⿼³¡
µÚ6Õ ͼÐνçÃæÉè¼Æ(¶þ)
(Ò»)¿Î³ÌÄÚÈÝ
6.1Ñ¡Ôñ¿òºÍµ¥Ñ¡°´Å¥
6.1.1Ñ¡Ôñ¿ò
6.1.2µ¥Ñ¡¿ò
6.1.3µ¥Ñ¡°´Å¥
6.1.4Ñ¡ÔñÏîĿʼþ´¦Àí
6.2ÁбíºÍ×éºÏ¿ò
6.2.1Áбí
6.2.2×éºÏ¿ò
6.3²Ëµ¥
6.3.1²Ëµ¥Ìõ¡ ......
µÚ9Õ ÊäÈëºÍÊä³öÁ÷
(Ò»)¿Î³ÌÄÚÈÝ
9.1×Ö½ÚÁ÷ºÍ×Ö·ûÁ÷
9.1.1 File¶ÔÏó
9.1.2Á÷¶ÔÏó
9.2»º³åʽÊäÈëÊä³ö
9.2.1»º³åʽÊäÈë
9.2.2»º³åʽÊä³ö
9.3Ëæ»ú·ÃÎÊ
9.4Îļþ¶Ô»°¿ò
(¶þ)ѧϰĿµÄÓëÒªÇó
±¾Õ½éÉÜJava³ÌÐòÊý¾ÝÎļþµÄÊäÈëÊä³ö¼¼Êõ¡£ÒªÇóÄܱàд¼òµ¥µÄJavaÎļþ´¦Àí³ÌÐò¡£
(Èý)¿¼ºË֪ʶµãÓ뿼ºËÒªÇó
1.´´½¨File¶ÔÏó£ ......