java equalsÓë== µÄÇø±ð
equals ·½·¨ÊÇ java.lang.Object ÀàµÄ·½·¨¡£
ÓÐÁ½ÖÖÓ÷¨ËµÃ÷£º
£¨1£©¶ÔÓÚ×Ö·û´®±äÁ¿À´Ëµ£¬Ê¹ÓÓ==”ºÍ“equals()”·½·¨±È½Ï×Ö·û´®Ê±£¬Æä±È½Ï·½·¨²»Í¬¡£
“==”±È½ÏÁ½¸ö±äÁ¿±¾ÉíµÄÖµ£¬¼´Á½¸ö¶ÔÏóÔÚÄÚ´æÖеÄÊ×µØÖ·¡£
“equals()”±È½Ï×Ö·û´®ÖÐËù°üº¬µÄÄÚÈÝÊÇ·ñÏàͬ¡£
±ÈÈ磺
String s1,s2,s3 = "abc", s4 ="abc" ;
s1 = new String("abc");
s2 = new String("abc");
ÄÇô£º
s1==s2 ÊÇ false //Á½¸ö±äÁ¿µÄÄÚ´æµØÖ·²»Ò»Ñù£¬Ò²¾ÍÊÇ˵ËüÃÇÖ¸ÏòµÄ¶ÔÏó²» Ò»Ñù£¬
¹Ê²»ÏàµÈ¡£
s1.equals(s2) ÊÇ true //Á½¸ö±äÁ¿µÄËù°üº¬µÄÄÚÈÝÊÇabc£¬¹ÊÏàµÈ¡£
×¢Ò⣨1£©£º
Èç¹û£º StringBuffer s1 = new StringBuffer("a");
StringBuffer s2 = new StringBuffer("a");
½á¹û£º s1.equals(s2) //ÊÇfalse
½âÊÍ£ºStringBufferÀàÖÐûÓÐÖØÐ¶¨ÒåequalsÕâ¸ö·½·¨£¬Òò´ËÕâ¸ö·½·¨¾ÍÀ´×ÔObjectÀ࣬
¶øObjectÀàÖеÄequals·½·¨ÊÇÓÃÀ´±È½Ï“µØÖ·”µÄ£¬ËùÒÔµÈÓÚfalse.
×¢Ò⣨2£©£º
¶ÔÓÚs3ºÍs4À´Ëµ£¬ÓÐÒ»µã²»Ò»ÑùÒªÒýÆð×¢Ò⣬ÓÉÓÚs3ºÍs4ÊÇÁ½¸ö×Ö·û
´®³£Á¿ËùÉú³ÉµÄ±äÁ¿£¬ÆäÖÐËù´æ·ÅµÄÄÚ´æµØÖ· ÊÇÏàµÈµÄ£¬
ËùÒÔs3==s4ÊÇtrue£¨¼´Ê¹Ã»ÓÐs3=s4ÕâÑùÒ»¸ö¸³ÖµÓï¾ä£©
£¨2£©¶ÔÓÚ·Ç×Ö·û´®±äÁ¿À´Ëµ£¬"=="ºÍ"equals"·½·¨µÄ×÷ÓÃÊÇÏàͬµÄ¶¼ÊÇÓÃÀ´±È½ÏÆä
¶ÔÏóÔÚ¶ÑÄÚ´æµÄÊ×µØÖ·£¬¼´ÓÃÀ´±È½ÏÁ½¸öÒýÓñäÁ¿ÊÇ·ñÖ¸Ïòͬһ¸ö¶ÔÏó¡£
±ÈÈ磺
class A
{
A obj1 = new A();
A obj2 = new A();
}
ÄÇô£ºobj1==obj2ÊÇfalse
obj1.equals(obj2)ÊÇfalse
µ«ÊÇÈç¼ÓÉÏÕâÑùÒ»¾ä£ºobj1=obj2;
ÄÇô obj1==obj2 ÊÇtrue
obj1.equals(obj2) ÊÇtrue
×ÜÖ®£ºequals·½·¨¶ÔÓÚ×Ö·û´®À´ËµÊDZȽÏÄÚÈݵ쬶ø¶ÔÓÚ·Ç×Ö·û´®À´ËµÊDZȽÏ
ÆäÖ¸ÏòµÄ¶ÔÏóÊÇ·ñÏàͬµÄ¡£
== ±È½Ï·ûÒ²ÊDZȽÏÖ¸ÏòµÄ¶ÔÏóÊÇ·ñ
Ïà¹ØÎĵµ£º
·µ»Ø¶à¸ö¶ÔÏó£º
PROCEDURE AUTO_SEL_INVOICE_DETAIL(
P_RESULT_LIST OUT SYS_REFCURSOR) AS
BEGIN
OPEN P_RESULT_LIST FOR
SELECT DISTINCT CC.CHARGE_COLLECTION_ID CHARGE_COLLECTION_ID, CC.COLLECT_DATE COLLECT_DATE, C ......
JavaÊÇÈçºÎ¹ÜÀíÄÚ´æ
ΪÁËÅжÏJavaÖÐÊÇ·ñÓÐÄÚ´æÐ¹Â¶£¬ÎÒÃÇÊ×ÏȱØÐëÁ˽âJavaÊÇÈçºÎ¹ÜÀíÄÚ´æµÄ¡£JavaµÄÄÚ´æ¹ÜÀí¾ÍÊǶÔÏóµÄ·ÖÅäºÍÊÍ·ÅÎÊÌâ¡£ÔÚJavaÖУ¬³ÌÐòÔ±ÐèҪͨ¹ý¹Ø¼ü×ÖnewΪÿ¸ö¶ÔÏóÉêÇëÄÚ´æ¿Õ¼ä (»ù±¾ÀàÐͳýÍâ)£¬ËùÓеĶÔÏó¶¼ÔÚ¶Ñ (Heap)ÖзÖÅä¿Õ¼ä¡£ÁíÍ⣬¶ÔÏóµÄÊÍ·ÅÊÇÓÉGC¾ö¶¨ºÍÖ´Ðеġ£ÔÚJavaÖУ¬ÄÚ´æµÄ·ÖÅäÊ ......
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>ʵÀý1</TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME=" ......
ÔÚÐÅϢʱ´ú£¬ÍøÂç¼¼ÊõÓ¦ÓÃÒѷdz£ÆÕͨ¡£ÆäÖзdz£¶àÓ¦Óö¼ÒÀÀµÓÚ´ÓÒ»¸öÖ÷»úÏò¶à¸öÖ÷»ú»ò´Ó¶à¸öÖ÷»úÏò¶à¸öÖ÷»ú·¢ËÍͬһÐÅÏ¢µÄÄÜÁ¦£¬ÔÚInternetÉÏ·Ö·¢µÄÊýÄ¿¿ÉÄÜ´ïÊýÊ®Íǫ̀£¬ÕâЩ¶¼ÐèÒª¸ü¸ßµÄ´ø¿í£¬²¢ÇÒ´ó´ó³¬³öÁ˵¥²¥µÄÄÜÁ¦¡£Ò»ÖÖÄÜ×î´óÏ޶ȵØÀûÓÃÏÖÓдø¿íµÄÖØÒª¼¼ÊõÊÇIP×é²¥¡£
1£®IP×é²¥¼¼ÊõµÄ¸ÅÄî
IP×é²¥¼¼Êõ£¬ÊÇÒ»ÖÖÔÊ ......
ÔÚJavaµÄÊÀ½çÀÎÞÂÛÀ໹ÊǸ÷ÖÖÊý¾Ý£¬Æä½á¹¹µÄ´¦ÀíÊÇÕû¸ö³ÌÐòµÄÂß¼ÒÔ¼°ÐÔÄܵĹؼü¡£ÓÉÓÚ±¾È˽Ӵ¥ÁËÒ»¸öÓйØÐÔÄÜÓëÂ߼ͬʱ²¢´æµÄÎÊÌ⣬ÓÚÊǾͿªÊ¼Ñо¿Õâ·½ÃæµÄÎÊÌâ¡£ÕÒ±éÁË´ó´óССµÄÂÛ̳£¬Ò²°Ñ¡¶Java ÐéÄâ»ú¹æ·¶¡·£¬¡¶apress,.java.collections.(2001),.bm.ocr.6.0.shareconnector¡·£¬ºÍ¡¶Thinking in Java¡··ÁËÒ²ÕÒ²»µ ......