JavaÖеÄ==ºÍequalsÇø±ð
ÒýÑÔ£º´ÓÒ»¸öÅóÓѵÄblogת¹ýÀ´µÄ£¬ÀïÃæ½â¾öÁËÁ½¸öÀ§ÈÅÎҺܾõÄÎÊÌâ¡£ºÜÓоúµ·ê¸ÊÁصĸоõ¡£
ÖÐÈí¹ú¼Êµç×ÓÕþÎñ²¿Jeff Chi×ܽᣬתÔØÇë˵Ã÷³ö´¦¡£
¸ÅÊö£º
A.==¿ÉÓÃÓÚ»ù±¾ÀàÐͺÍÒýÓÃÀàÐÍ£ºµ±ÓÃÓÚ»ù±¾ÀàÐÍʱºò£¬ÊDZȽÏÖµÊÇ·ñÏàͬ£»µ±ÓÃÓÚÒýÓÃÀàÐ͵Äʱºò£¬ÊDZȽ϶ÔÏóÊÇ·ñÏàͬ¡£
B.¶ÔÓÚString a = “a”; Integer b = 1;ÕâÖÖÀàÐ͵ÄÌØÓжÔÏó´´½¨·½Ê½£¬==µÄʱºòÖµÊÇÏàͬµÄ¡£
C.»ù±¾ÀàÐÍûÓÐequals·½·¨£¬equalsÖ»±È½ÏÖµ£¨¶ÔÏóÖеÄÄÚÈÝ£©ÊÇ·ñÏàͬ£¨Ïàͬ·µ»Øtrue£©¡£
D.Ò»¸öÀàÈç¹ûûÓж¨Òåequals·½·¨£¬Ëü½«Ä¬Èϼ̳ÐObjectÖеÄequals·½·¨£¬·µ»ØÖµÓë==·½·¨Ïàͬ¡£
ÏêÊö£º
¢Ù==ºÍequalsµÄʵÖÊ¡£
ÔÚJAVAÖÐÀûÓÃ"=="±È½Ï±äÁ¿Ê±,ϵͳʹÓñäÁ¿ÔÚ"Õ»"ÖÐËù´æµÄÖµ×÷Ϊ±È½ÏµÄÒÀ¾Ý¡£
»ù±¾Êý¾ÝÀàÐÍÔÚ"Õ»"ÖдæµÄÊÇÆäÄÚÈÝÖµ,¶ø¶ÔÏóÀàÐÍÔÚ"Õ»"ÖдæµÄÊǵØÖ·,ÕâЩµØÖ·Ö¸Ïò"¶Ñ"ÖеĶÔÏó¡£
java.lang°üÖеÄObjectÀàÓÐpublic boolean equals(Object obj)·½·¨,Ëü±È½ÏÁ½¸ö¶ÔÏóÊÇ·ñÏàµÈ¡£
ÆäËü¶ÔÏóµÄequals·½·¨½öµ±±»±È½ÏµÄÁ½¸öÒýÓÃÖ¸ÏòµÄ¶ÔÏóÄÚÈÝÏàͬʱ,¶ÔÏóµÄequals()·½·¨·µ»Øtrue¡£
×ÜÖ®,"=="ºÍ"!="±È½ÏµÄÊǵØÖ·.Ò²¿ÉÈÏΪ"=="ºÍ"!="±È½ÏµÄÊǶÔÏó¾ä±ú;¶øequals()±È½ÏµÄÊǶÔÏóÄÚÈÝ.»òÕß˵,,"=="ºÍ"!="±È½ÏµÄÊÇ"Õ»"ÖеÄÄÚÈÝ,¶øequals()±È½ÏµÄÊÇ"¶Ñ"ÖеÄÄÚÈÝ.
¢Ú==²Ù×÷·û¡£×¨ÃÅÓÃÀ´±È½ÏÁ½¸ö±äÁ¿µÄÖµÊÇ·ñÏàµÈ£¬Ò²¾ÍÊÇÓÃÓڱȽϱäÁ¿Ëù¶ÔÓ¦µÄÄÚ´æÖÐËù´æ´¢µÄÊýÖµÊÇ·ñÏàͬ£¬Òª±È½ÏÁ½¸ö»ù±¾ÀàÐ͵ÄÊý¾Ý»òÁ½¸öÒýÓñäÁ¿ÊÇ·ñÏ൱£¬Ö»ÄÜÓÃ==²Ù×÷·û¡£
JavaµÄ»ù±¾Êý¾ÝÀàÐÍΪ(char£¬byte£¬short£¬int£¬long£¬float£¬double£¬boolean)¡£
Èç¹ûÒ»¸ö±äÁ¿Ö¸ÏòµÄÊý¾ÝÊǶÔÏóÀàÐ͵ģ¬ÄÇô£¬ÕâʱºòÉæ¼°ÁËÁ½¿éÄڴ棬¶ÔÏó±¾ÉíÕ¼ÓÃÒ»¿éÄÚ´æ(¶ÔÄÚ´æ)£¬±äÁ¿±¾ÉíÒ²Õ¼ÓÃÒ»¿éÄڴ棬ÀýÈçObject obj = new Object()±äÁ¿objÊÇÒ»¸öÄڴ棬new Object()ÊÇÒ»¸öÄڴ棬´Ëʱ£¬±äÁ¿Ëù¶ÔÓ¦µÄÄÚ´æÖд洢µÄÊý¾Ý¾
Ïà¹ØÎĵµ£º
¡ñÀûÓÃsplitº¯Êý£º String s = new String("2_8_7_4_3_9_1"); String[] arr = s.split("_"); JavaÖÐÓÃsplitº¯Êý½øÐзָî×Ö·û´®¡£ 1.Óï·¨ÈçÏ String.split(sourceStr,maxSplit) String.split(sourceStr) ²ÎÊý˵Ã÷£ºsourceStrÊDZ»·Ö¸îµÄ×Ö·û´®£¬maxSplitÊÇ×î´óµÄ·Ö¸îÊý ·µ»Øֵ˵Ã÷£ºsplitº¯ÊýµÄ·µ»ØÖµÊÇÒ»¸ö×Ö ......
1¡¢Á½Äê¼°ÒÔÉÏJ2EEʵ¼Ê¿ª·¢¾Ñé
2¡¢ÊìϤJAVA WEB¿ª·¢£¬°üÀ¨JAVASCRIPT¡¢JSP¡¢SERVLET¡¢WEBSERVICE¡¢PORTLETµÈ£»
3¡¢ÊìϤ³£Óÿò¼Ü(È磺 STRUTS2/SPRING/HIBERNATE/IBATISµÈ)£»
4¡¢ÖÁÉÙÊìϤһÖÖÖ÷Á÷¹ØϵÊý¾Ý¿âϵͳ£¬ÀýÈçORACLE¡¢MYSQL¡¢MSSQLµÈ
1.ÊìÁ·ÕÆÎÕJava¡¢HTML¡¢JavaScriptµÈÓïÑÔ£»
2.ÊìÁ·ÕÆÎÕJSP/Ser ......
//¹þ¸¥Âü±àÂëµÄʵÏÖÀà
public class HffmanCoding {
private int charsAndWeight[][];// [][0]ÊÇ ×Ö·û£¬[][1]´æ·ÅµÄÊÇ×Ö·ûµÄȨֵ£¨´ÎÊý£©
private int hfmcoding[][];// ´æ·Å¹þ¸¥ÂüÊ÷
private int i = 0;// Ñ»·±äÁ¿
private String hcs[];
public HffmanCoding(int[][] chars) {
// TODO ¹¹Ôì·½·¨
......
JAVATMÓëXML 2010-05-14
Ò»¡¢¸ÅÄî
l ÈκÎXMLÎĵµ¶ÔÈκÎÀàÐ͵ÄÓ¦ÓÃÒÔ¼°ÕýÈ·µÄ½âÎö¶¼±ØÐë¾ßÓÐÁ¼ºÃµÄ½á¹¹well-formed
l XMLÎĵµ¿ÉÒÔÊÇÓÐЧµØ£¨valid£©£¬µ«²¢·ÇÒ»¶¨ÒªÇóÓÐЧ¡£
l PI£¨processing instruction£©¸ñʽ£º<?target instructions?>¡£XMLÖеĴ¦ÀíÖ¸ÁîÖ»ÄÜÊǽâÎöÆ÷¿ÉÒÔʶ±ðµÄXML±ê×¼´¦ÀíÃüÁ ......