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 ×îÐÂÎÄÕ : java

JAVA ÅàѵÌâ¿â JSP

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1. ÒÔÏÂÑ¡ÏîÖв»ÊÇjspÒþʽ¶ÔÏóµÄÊÇ£º£¨ £©
A  pageContext
B  context
C  application
D  out
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2. ÏÂÃæÄÄÒ»¸ö²»ÊÇJSP±¾ÉíÒѼÓÔØµÄ»ù±¾Àࣿ£¨ £©
A  java.lang.* 
B  java.io.* 
C  javax.servlet.* 
D  javax.servlet.jsp.*
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3. ÒÔ϶ÔÓÚÔ¤¶¨Òå<%!Ô¤¶¨Òå%>µÄ˵·¨´íÎóµÄÊÇ£º£¨ £©
A  Ò»´Î¿ÉÉùÃ÷¶à¸ö±äÁ¿ºÍ·½·¨£¬Ö»ÒªÒÔ“£»”½áβ¾ÍÐÐ
B  Ò»¸öÉùÃ÷½öÔÚÒ»¸öÒ³ÃæÖÐÓÐЧ
C  ÉùÃ÷µÄ±äÁ¿½«×÷Ϊ¾Ö²¿±äÁ¿
D  ÔÚÔ¤¶¨ÒåÖÐÉùÃ÷µÄ±äÁ¿½«ÔÚJSPÒ³Ãæ³õʼ»¯Ê±³õʼ»¯
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4. ÏÂÁйØÓÚJavaBeanµÄ˵·¨ÕýÈ·µÄÊÇ£º£¨ £©
A  JavaÎļþÓëBeanËù¶¨ÒåµÄÀàÃû¿ÉÒÔ²»Í¬£¬µ«Ò»¶¨Òª×¢ÒâÇø·Ö×ÖĸµÄ´óСд
B  ÔÚJSPÎļþÖÐÒýÓÃBean£¬Æäʵ¾ÍÊÇÓÃ<jsp:useBean>Óï¾ä
C  ±»ÒýÓõÄBeanÎļþµÄÎļþÃûºó׺Ϊ.java 
D  BeanÎļþ·ÅÔÚÈκÎĿ¼Ï¶¼¿ÉÒÔ±»ÒýÓÃ
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5. Ò»¸öJSP Ò³Ãæ¾­¹ý±àÒëÖ®ºó£¬½«´´½¨Ò»¸ö£º£¨ £©
A£® applet
B£® severlet
C£® application
D£® exeÎļþ
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6. ÔÚJ ......

ÎÒµÄJava×ܽá

1£® OverloadºÍOverrideµÄÇø±ð¡£OverloadedµÄ·½·¨ÊÇ·ñ¿ÉÒԸı䷵»ØÖµµÄÀàÐÍ
  ´ð£º·½·¨µÄÖØÐ´OverridingºÍÖØÔØOverloadingÊÇJava¶à̬ÐԵIJ»Í¬±íÏÖ¡£ÖØÐ´Overriding    ÊǸ¸ÀàÓë×ÓÀàÖ®¼ä¶à̬ÐÔµÄÒ»ÖÖ±íÏÖ£¬ÖØÔØOverloadingÊÇÒ»¸öÀàÖжà̬ÐÔµÄÒ»ÖÖ±íÏÖ¡£ Èç¹ûÔÚ×ÓÀàÖж¨Òåij·½·¨ÓëÆä¸¸ÀàÓÐÏàͬµÄÃû³ÆºÍ²ÎÊý£¬ÎÒÃÇ˵¸Ã·½·¨±»ÖØÐ´ (Overriding)¡£×ÓÀàµÄ¶ÔÏóʹÓÃÕâ¸ö·½·¨Ê±£¬½«µ÷ÓÃ×ÓÀàÖе͍Ò壬¶ÔËü¶øÑÔ£¬¸¸ÀàÖе͍ÒåÈçͬ±»"ÆÁ±Î"ÁË¡£Èç¹ûÔÚÒ»¸öÀàÖж¨ÒåÁ˶à¸öͬÃûµÄ·½·¨£¬ËüÃÇ»òÓв»Í¬µÄ²ÎÊý¸öÊý»òÓв»Í¬µÄ²ÎÊýÀàÐÍ£¬Ôò³ÆÎª·½·¨µÄÖØÔØ(Overloading)¡£OverloadedµÄ·½·¨ÊÇ¿ÉÒԸı䷵»ØÖµµÄÀàÐÍ
2 ³£¼ûµÄrunTime exception
´ð£ºArithmeticException,(Ëã·¨´íÎó)£¬IllegalArgumentException(²»ºÏ·¨µÄ²ÎÊýÒì³£),NullpointerException(¿ÕÖ¸ÕëÒì³£´íÎó),ClassCastException(ÀàÐÍת»»´íÎó),ArrayStoreException(Êý×é´æ´¢´íÎó);
3.String ºÍStringBufferµÄÇø±ð:
String µÄ³¤¶ÈÊDz»±äµÄ£¬StringBufferµÄ³¤¶ÈÊǿɱäµÄ£¬ËüÃÇÀïÃæµÄʵÏÖ·½Ê½²»Í¬¡£Èç¹û¾­³£±ä»¯¾ÍÓÃ
StringBuffer£¬Èç¹û×îºóÒªÒª±ä³ÉStringÓÃStringBufferÖеÄtoString()·½·¨¡£
4£®Hashtable ºÍ ......

java ¿ì½Ý¼ü

Ctrl+1 ¿ìËÙÐÞ¸´(×î¾­µäµÄ¿ì½Ý¼ü,¾Í²»Óöà˵ÁË)
Ctrl+D: ɾ³ýµ±Ç°ÐÐ
Ctrl+Alt+↓ ¸´ÖƵ±Ç°Ðе½ÏÂÒ»ÐÐ(¸´ÖÆÔö¼Ó)
Ctrl+Alt+↑ ¸´ÖƵ±Ç°Ðе½ÉÏÒ»ÐÐ(¸´ÖÆÔö¼Ó)
Alt+↓ µ±Ç°ÐкÍÏÂÃæÒ»Ðн»»¥Î»ÖÃ(ÌØ±ðʵÓÃ,¿ÉÒÔʡȥÏȼôÇÐ,ÔÙÕ³ÌùÁË)
Alt+↑ µ±Ç°ÐкÍÉÏÃæÒ»Ðн»»¥Î»ÖÃ(ͬÉÏ)
Alt+← ǰһ¸ö±à¼­µÄÒ³Ãæ
Alt+→ ÏÂÒ»¸ö±à¼­µÄÒ³Ãæ(µ±È»ÊÇÕë¶ÔÉÏÃæÄÇÌõÀ´ËµÁË)
Alt+Enter ÏÔʾµ±Ç°Ñ¡Ôñ×ÊÔ´(¹¤³Ì,or Îļþ orÎļþ)µÄÊôÐÔ
Shift+Enter ÔÚµ±Ç°ÐеÄÏÂÒ»ÐвåÈë¿ÕÐÐ(ÕâʱÊó±ê¿ÉÒÔÔÚµ±Ç°ÐеÄÈÎһλÖÃ,²»Ò»¶¨ÊÇ×îºó)
Shift+Ctrl+Enter ÔÚµ±Ç°ÐвåÈë¿ÕÐÐ(Ô­ÀíͬÉÏÌõ)
Ctrl+Q ¶¨Î»µ½×îºó±à¼­µÄµØ·½
Ctrl+L ¶¨Î»ÔÚijÐÐ (¶ÔÓÚ³ÌÐò³¬¹ý100µÄÈ˾ÍÓи£ÒôÁË)
Ctrl+M ×î´ó»¯µ±Ç°µÄEdit»òView (ÔÙ°´Ôò·´Ö®)
Ctrl+/ ×¢Ê͵±Ç°ÐÐ,ÔÙ°´ÔòÈ¡Ïû×¢ÊÍ
Ctrl+O ¿ìËÙÏÔʾ OutLine
Ctrl+T ¿ìËÙÏÔʾµ±Ç°ÀàµÄ¼Ì³Ð½á¹¹
Ctrl+W ¹Ø±Õµ±Ç°Editer
Ctrl+K ²ÎÕÕÑ¡ÖеÄWord¿ìËÙ¶¨Î»µ½ÏÂÒ»¸ö
Ctrl+E ¿ìËÙÏÔʾµ±Ç°EditerµÄÏÂÀ­Áбí(Èç¹ûµ±Ç°Ò³ÃæÃ»ÓÐÏÔʾµÄÓúÚÌå±íʾ)
Ctrl+/(С¼üÅÌ) ÕÛµþµ±Ç°ÀàÖеÄËùÓдúÂë
Ctrl+×(С¼üÅÌ) Õ¹¿ªµ±Ç°ÀàÖеÄËùÓдúÂë
Ctrl+Space ´úÂëÖúÊÖÍê³ÉÒ» ......

javaÖÐKeytoolµÄʹÓÃ×ܽá

ÒÔǰÓùý¼¸´ÎÕâ¸ö¶«¶«£¬µ«Ã¿´Î¶¼ÖØÐ²éѯһ´Î¡£±¾ÎÄԭʼ³ö´¦ÊÇÕâÀï ¡£
£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­£­
Keytool ÊÇÒ»¸öJava Êý¾ÝÖ¤ÊéµÄ¹ÜÀí¹¤¾ß ,Keytool ½«ÃÜÔ¿£¨key£©ºÍÖ¤Ê飨certificates£©´æÔÚÒ»¸ö³ÆÎªkeystoreµÄÎļþÖÐÔÚkeystoreÀ°üº¬Á½ÖÖÊý¾Ý£º
ÃÜԿʵÌ壨Key entity£©——ÃÜÔ¿£¨secret key£©ÓÖ»òÕßÊÇ˽ԿºÍÅä¶Ô¹«Ô¿£¨²ÉÓ÷ǶԳƼÓÃÜ£©
¿ÉÐÅÈεÄÖ¤ÊéʵÌ壨trusted certificate entries£©——Ö»°üº¬¹«Ô¿
ailas(±ðÃû)ÿ¸ökeystore¶¼¹ØÁªÕâÒ»¸ö¶ÀÒ»ÎÞ¶þµÄalias£¬Õâ¸öaliasͨ³£²»Çø·Ö´óСд
JDKÖÐkeytool ³£ÓÃÃüÁî:
-genkey      ÔÚÓû§Ö÷Ŀ¼Öд´½¨Ò»¸öĬÈÏÎļþ".keystore",»¹»á²úÉúÒ»¸ömykeyµÄ±ðÃû£¬mykeyÖаüº¬Óû§µÄ¹«Ô¿¡¢Ë½Ô¿ºÍÖ¤Êé
(ÔÚûÓÐÖ¸¶¨Éú³ÉλÖõÄÇé¿öÏÂ,keystore»á´æÔÚÓû§ÏµÍ³Ä¬ÈÏĿ¼£¬È磺¶ÔÓÚwindow xpϵͳ£¬»áÉú³ÉÔÚϵͳµÄC:\Documents and Settings\UserName\ÎļþÃûΪ“.keystore”)
-alias       ²úÉú±ðÃû
-keystore    Ö¸¶¨ÃÜÔ¿¿ ......

java²»³£ÓÃ

strictfp ¹Ø¼ü×Ö
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public static void main(String[] args){
double w = 7*8/3;
System.out.println(w);
}
public static strictfp void main(String[] args){
double w = 7*8/3;
System.out.println(w);
}
ÔËÐнá¹û¶¼ÊÇ 18.0;
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1.strictfp: strict float point ¾«È·¸¡µã£¬Ê¹ÓÃÁËstrictfp¹Ø¼ü×־ͱØÐëʹÓÃÑϸñµÄ¸¡µã¼ÆËã¡£
2.Ïê½â£º
¿ÉÒÆÖ²ÊÇjavaÓïÑÔµÄÉè¼ÆÄ¿±êÖ®Ò»¡£ÎÞÂÛÔÚÄĸöÐéÄâ»úÉÏÔËÐУ¬Í¬Ò»¸öÔËËãÓ¦¸ÃµÃµ½Í¬ÑùµÄ½á¹û¡£¶ÔÓÚ¸¡µãÊýµÄËãÊõÔËË㣬ʵÏÖÕâÑùµÄ¿ÉÒÆÖ²ÐÔÊÇÏ൱À§Äѵġ£
doubleÀàÐÍʹÓÃ64λ´æ´¢Ò»¸ödoubleÊýÖµ£¬¶øÓÐЩ´¦ÀíÆ÷ʹÓÃ80λ¸¡µã¼Ä´æÆ÷¡£ÕâЩ¼Ä´æÆ÷Ôö¼ÓÁËÖÐ¼ä¼ÆË㾫¶È¡£ÀýÈ磬ÏÂÁÐÔËË㣺double w = x * y / z;
ºÜ¶àIntel´¦Àí¼ÆËãx * y£¬²¢ÇÒ½«½á¹û´æ´¢ÔÚ80λµÄ¼Ä´æÆ÷ÖУ¬ÔÙ³ýÒÔz²¢½«½á¹û½Ø¶ÏΪ64λ¡£ÕâÑù¿ÉÒԵõ½Ò»¸ö¸ü¼Ó¾«È·µÄ¼ÆËã½á¹û£¬²¢ÇÒ»¹Äܹ»±ÜÃâ²úÉúÖ¸ÊýÒç³ö¡£
µ« ......

javaºÍ.net»¥Ïàµ÷ÓÃwebservice×¢ÒâÊÂÏî

×îºóÔÚÑо¿GWT,ÐèÒªÓõ½.net µÄwebservice,ÍøÉÏËÑÁ˵ã´úÂë,»ù±¾ÉÏÎÊÌâ¶à¶à.
JavaÒªµ÷ÓÃ.netµÄwebserviceÊÇÐèÒªÒ»¸öaxisµÄ°üµÄ. ÐèÒªÏÂÔØ,È»ºóÒýÓÃ.
ÒýÓõÄʱºò,ÐèҪעÒâһЩСÎÊÌâ.
Java ¶Ë
public String ServiceLogon(String user, String pwd) throws ServiceException  
    {  
        String url="http://localhost/WebServices/Service.asmx";  
        Service service = new Service();  
        Call call = (Call)service.createCall();  
        //We have to figure our the namespace. The java doesn't know where is the namespace  
        call.setOperationName(new QName("http://localhost/WebServices/Service.asmx","Logon"));  
          
        cal ......
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