Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

JAVAÖØÐ´equals·½·¨


VAÎÊÌâµÄÒý³ö£º½ñÌì±àд̰³ÔÉß³ÌÐòµÄʱºòÓöµ½ÕâÑùÒ»¸öÎÊÌâ
public class Coordinate {
 public int headX, headY;
 Coordinate(int headX, int headY) {
  this.headX = headX;
  this.headY = headY;
 }
  
 public boolean equals(Coordinate c) {
   if(this.headX == c.headX && this.headY == c.headY) {
      return true;
   } else {
      return false;
   }
}
˵Ã÷£ºCoordinate ÊÇÒ»¸ö×ø±êÀà£¬ÖØÐ´equals·½·¨µÄÔ­ÒòÊÇÒª±È½ÏÉßÉíÊÇ·ñµ½´ïÁ˼ǼÏÂÀ´µÄÉßÍ·µÄתÍäµã£¬ÓÚÊÇ×Ô¼ºÖØÐ´ÁËequals·½·¨£¬µ«ÊÇ·¢ÏÖûÓÐЧ¹û£¬¼´Ê¹x£¬yµÄÖµÒ»Ñù£¬·µ»ØµÄÒ²ÊÇfalse¡£
ΪÁ˽øÒ»²½ÊìϤequals·½·¨£¬ÓÚÊÇ×Ô¼ºÓÖÏÈдÁËÏÂÃæÒ»¸öÑéÖ¤µÄ³ÌÐò£º
public class TestEquals {
 public static void main(String[] args) {
  Dog d1 = new Dog(1);
  Dog d2 = new Dog(1);
  System.out.println(d1 == d2);
  System.out.println(d1.equals(d2));
 }
}
class Dog {
 int weight;
 
 Dog(int weight) {
  this.weight = weight;
 }
  public boolean equals(Dog d) {
    if(this.weight == d.weight) {
       return true;
    } else {
       return false;
    }
  }
}
µ±È»½á¹ûÊÇÒ»ÑùµÄ£¬ÎªÁ˽øÒ»²½ÑéÖ¤£¬ÓÚÊǾͽøÒ»²½ÖØÐ´ÁËhashCode()·½·¨£º
public int hashCode() {
   return 0;
}
ÒòΪÓÐʱºòÓÅÏȱȽϵÄÊÇhashCodeÂë¡£µ«Êǽá¹û»¹ÊDz»ÐС£ÎÒÖ»ºÃÕÒ»ØÔ­À´¿´¹ýµÄÂíÊ¿±øÀÏʦµÄÊÓÆµ½Ì³Ì£¬²Å·¢ÏÖ×Ô¼º¶ÔÕâ¸öÖØÐ´ºÜ²»ÊìϤ£¬ÕýÈ·µÄд·¨Ó¦¸ÃÊÇ£º
public class Coordinate {
 public int headX, headY;
 Coordinate(int headX, int headY) {
  this.headX = headX;
  this.headY = headY;
 }
 
 public int hashCode() {
  return 0;
 }
 
 public boolean equals(Object obj) {
  if(obj == null) {
   return false;
 &n


Ïà¹ØÎĵµ£º

sql 2005 ´æ´¢¹ý³Ì·ÖÒ³ java ´úÂë

 create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',         
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ ......

Java½âÊÍExcelÊý¾Ý£¨jxl.jar°üµÄʹÓã©

»ù±¾²Ù×÷
Ò»¡¢´´½¨Îļþ
ÄâÉú³ÉÒ»¸öÃûΪ“²âÊÔÊý¾Ý.xls”µÄExcelÎļþ£¬ÆäÖеÚÒ»¸ö¹¤×÷±í±»ÃüÃûΪ“µÚÒ»Ò³”£¬´óÖÂЧ¹ûÈçÏ£º
/*
* Created on Dec 30, 2007
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Cod ......

Hibernate,java,sqlÀàÐ͵ĶÔÓ¦¹ØÏµ


JavaÊý¾ÝÀàÐÍ
HibernateÊý¾ÝÀàÐÍ
±ê×¼SQLÊý¾ÝÀàÐÍ
byte
byte
TINYINT
short
short
SMALLINT
int
integer
INGEGER
long
long
BIGINT
float
float
FLOAT
double
double
DOUBLE
java.math.BigDecimal
big_decimal
NUMERIC
char, java.lang.Character
character
CHAR(1)
boolean, java.lang.Boole ......

ÓÐÓõÄjava¿ª·¢Ð¡¹¤¾ß¼°jar°ü

    ÒòΪ¾­³£°áÀ´°áÈ¥£¬×Ô¼ºÊÕ¼¯µÄºÃµÄ¶«¶«Ò²¾­³£¸ú×ÅÎҰᣬ¾­³£ÕÒ²»µ½¡£½ñÌìÕûÀíÁËÕûÀí£¬ÒÔºó°Ñ×Ô¼ºÊÕ¼¯µÄһЩС¶«Î÷ÉÏ´«µ½CSDNµÄÏÂÔØÆµµÀ“ÎÒµÄ×ÊÔ´”ÀïÈ¥£¨http://xlw2003.download.csdn.net/£©¡£ÒÔºó×Ô¼ºÏëÓÃÁË£¬Ò²ÖªµÀÉÏÄĶùÕÒÈ¥¡£Í¬Ê±ÄØ£¬ÆäËûÅóÓÑÒ²¿ÉÒÔÏÂÔØÀ´Óᣠ......

Berkely DB Java Editionѧϰ±Ê¼ÇÒ»

Berkely DB¶ÔÓڸ߲¢·¢¡¢ÒªÇóËÙ¶È¿ìµÄÓ¦ÓÃÀ´ËµÊǸö²»´íµÄÑ¡Ôñ£¬mysql¾ÍÊÇÓÃBDBʵÏÖµÄ(mysqlµÄºǫ́) £¬mysql¿ì£¬BDB±Èmysql»¹Òª¿ìN±¶¡£BDBÊÇÒ»ÖÖǶÈëʽµÄ¡¢·Ç¹ØÏµÊý¾Ý¿â£¬ËüÓëÆäËûµÄ¹ØÏµÊý¾Ý¿âRMDBS²»Í¬,ËüûÓÐÌṩSQL,¶øÊÇÌṩÁË×Ô¼ºµÄ·ÃÎʽӿڡ£×÷ΪһÖÖǶÈëʽµÄÊý¾Ý¿â£¬ËüÊǽø³ÌÄÚģʽµÄ£¬Ò²¾ÍÊÇ˵ËüºÍÓ¦ÓóÌÐòÔÚͬһÄÚ´æ¿ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ