Java ÄÚ²¿Àà
¶¨ÒåÔÚÒ»¸öÀàÄÚ²¿µÄÀà½ÐÄÚ²¿À࣬°üº¬ÄÚ²¿ÀàµÄÀà³ÆÎªÍⲿÀà¡£
ÄÚ²¿Àà¿ÉÒÔÉùÃ÷public¡¢protected¡¢privateµÈ·ÃÎÊÏÞÖÆ£¬
¿ÉÒÔÉùÃ÷ΪabstractµÄ¹©ÆäËûÄÚ²¿Àà»òÍⲿÀà¼Ì³ÐÓëÀ©Õ¹£¬
»òÕßÉùÃ÷Ϊstatic¡¢finalµÄ£¬Ò²¿ÉÒÔʵÏÖÌØ¶¨µÄ½Ó¿Ú¡£
staticµÄÄÚ²¿ÀàÐÐΪÉÏÏóÒ»¸ö¶ÀÁ¢µÄÀ࣬
·ÇstaticÔÚÐÐΪÉÏÀàËÆÀàµÄÊôÐÔ»ò·½·¨ÇÒ½ûÖ¹ÉùÃ÷staticµÄ·½·¨¡£
ÄÚ²¿Àà¿ÉÒÔ·ÃÎÊÍⲿÀàµÄËùÓз½·¨ÓëÊôÐÔ£¬
µ«staticµÄÄÚ²¿ÀàÖ»ÄÜ·ÃÎÊÍⲿÀàµÄ¾²Ì¬ÊôÐÔÓë·½·¨¡£
JavaµÄÉè¼ÆÕßÔÚÄÚ²¿ÀàÉíÉϵÄÈ·ÊÇרÐÄÁ¼¿à¡£Ñ§»áʹÓÃÄÚ²¿À࣬ÊǰÑÎÕJava¸ß¼¶±à³ÌµÄÒ»²¿·Ö£¬Ëü¿ÉÒÔÈÃÄã¸üÓÅÑŵØÉè¼ÆÄãµÄ³ÌÐò½á¹¹¡£
ΪʲôÐèÒªÄÚ²¿Àࣿ
javaÖеÄÄÚ²¿ÀàºÍ½Ó¿Ú¼ÓÔÚÒ»Æð£¬¿ÉÒÔʵÏÖ¶à¼Ì³Ð¡£
¿ÉÒÔʹijЩ±àÂë¸ù¼ò½à¡£
Òþ²ØÄã²»ÏëÈñðÈËÖªµÀµÄ²Ù×÷¡£
·Ç¾²Ì¬ÄÚ²¿Àà¶ÔÏóÓÐ×ÅÖ¸ÏòÆäÍⲿÀà¶ÔÏóµÄÒýÓÃ
Ò»¸ö¾²Ì¬³ÉÔ±À࣬ÈôÈ¥µô“static”¹Ø¼ü×Ö£¬¾Í³ÉΪ³ÉÔ±Àà¡£
package tao.test;
public class Outer {
public Outer(){
// ÔÚÄÚ²¿ÀàµÄÍⲿÀàµÄ¹¹Ôì·½·¨Öд´ÔìÄÚ²¿Àà¶ÔÏó
new Inner();
}
public static void fun(){
Outer out = new Outer();
Inner in = out.new Inner();
// Èç¹ûÄÚ²¿Àà±» static ÐÞÊΣ¬Ôò¿ÉÒÔ
// Inner in = new Inner();
}
//static class Inner{
class Inner{
public Inner(){
Outer out = new Outer();
}
public Outer getOuter(){
return Outer.this;
}
}
Ïà¹ØÎĵµ£º
±àдһ¸ö¼òµ¥µÄÎı¾±à¼Æ÷£¬ÒªÇ󣺾ßÓдò¿ª¡¢±£´æ¡¢Ð½¨£¬Õ³Ìù¡¢¸´ÖƵȹ¦ÄÜ£»¾ßÓÐÒ»¸ö¹¤¾ßÌõ¡£±àдһ¸öÀàËÆ Windows ¼Çʱ¾µÄ¼òµ¥³ÌÐò£¬¸Ã³ÌÐòÄܹ»´´½¨ÐÂÎļþ¡¢¶ÁÈ¡ÒѾ´æÔÚµÄÎļþ¡¢²é¿´ºÍÐÞ¸ÄÎı¾ÒÔ¼°±£´æÎªÎı¾Îļþ¡£
ÔÝʱ»¹²»»á×ö£¬Å¬Á¦ÖС£¡£¡£¡£¡£¡£¡£¡£ ......
JNIÊÇJava Native InterfaceµÄËõд£¬Í¨¹ýʹÓÃnative·½·¨£¬Java¿ÉÒÔµ÷Óñ¾µØC/C++×Ó³ÌÐò¡£ÉùÃ÷Ò»¸ö±¾µØ×Ó³ÌÐòµÄ·½·¨ÊÇ£ºÔÚ·½·¨ÃûǰÌí¼ÓnativeÐÞÊΣ¬Èç
public native void myfun();
µ÷ÓøÃ×Ó³ÌÐòµÄ·½·¨Îª£º
static{
System.loadLibrary("myfun");
}
ÔÚWindowsÉÏ£¬ÉÏÃæµÄmyfun¼´Ö¸°üº¬ÓÃC/C++дµÄmy ......
SetºÍÊýѧÖеļ¯ºÏÊÇͬһ¸ö¸ÅÄ¾ÍÊÇûÓÐÖØ¸´ÔªËصļ¯ºÏ¡£
ÕâÆªÎÄÕÂÖ÷ÒªÂÛÊöÁËSetÊÇÈçºÎʵÏÖ"ûÓÐÖØ¸´ÔªËØ"£¨no duplicate elements£©µÄ£¬ÒÔ¼°²ûÊöÁËʲôÊÇ“ÖØ¸´”£¨duplicate£©£¬ÊÇÏàͬµÄµØÖ·¿Õ¼ä£¿ÊÇequalsµÄ·µ»ØÖµÎªtrue£¿ÊÇcompareToµÄ·µ»ØÖµÎª0 £¿»¹ÊÇÓÐÏàͬµÄhashCode£¿±¾ÎÄ»¹¸ø³öÁËÔÚʲôÇé¿öÏÂʹÓÃʲà ......
ÊìϤC++µÄÈ˶ÔÓÚÁ½¸ö×Ö·û´®±È½ÏµÄ´úÂëÒ»¶¨ºÜÁ˽⣺
(string1==string2)
µ«ÔÚjavaÖУ¬Õâ¸ö´úÂ뼴ʹÔÚÁ½¸ö×Ö·û´®ÍêÈ«ÏàͬµÄÇé¿öÏÂÒ²»á·µ»Øfalse
JavaÖбØÐëʹÓÃstring1.equals(string2)À´½øÐÐÅжÏ
²¹³ä
Èç¹û£º
string s1=new String("Hello");
string s2=new String("Hello");
Ôò(s1==s2)=false
Èç¹û ......
Ò»¡¢JAVA¡£ÒªÏë³ÉΪJAVA£¨¸ß¼¶£©¹¤³Ìʦ¿Ï¶¨ÒªÑ§Ï°JAVA¡£Ò»°ãµÄ³ÌÐòÔ±»òÐíÖ»ÐèÖªµÀһЩJAVAµÄÓï·¨½á¹¹¾Í¿ÉÒÔÓ¦¸¶ÁË¡£µ«Òª³ÉΪJAVA£¨¸ß¼¶£©¹¤³Ìʦ£¬ÄúÒª¶ÔJAVA×ö±È½ÏÉîÈëµÄÑо¿¡£ÄúÓ¦¸Ã¶àÑо¿Ò»ÏÂJDBC¡¢IO°ü¡¢Util°ü¡¢Text°ü¡¢JMS¡¢EJB¡¢RMI¡¢Ï̡߳£Èç¹û¿ÉÄÜ£¬Ï£ÍûÄú¶ÔJAVAµÄËùÓаü¶¼ä¯ÀÀһϣ¬ÖªµÀ´ó¸ÅµÄAPI£¬ÕâÑùÄú¾Í·¢ÏÖÆä ......