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

¡¾×ª¡¿Java double Ïà¼ÓµÄ¹ÖÊÂÇé

(±¾ÎÄ×ªÔØ×Ô£ºhttp://hi.baidu.com/edilyxin/blog/item/27dc152aba3e10315343c19c.html)
ÎÊÌâµÄÌá³ö£º  
±àÒëÔËÐÐÏÂÃæÕâ¸ö³ÌÐò»á¿´µ½Ê²Ã´£¿  
public   class   Test{  
          public   static   void   main(String   args[]){  
                  System.out.println(0.05+0.01);  
                  System.out.println(1.0-0.42);  
                  System.out.println(4.015*100);  
                  System.out.println(123.3/100);  
          }  
};  
   
ÄãûÓп´´í£¡½á¹ûȷʵÊÇ  
0.060000000000000005  
0.5800000000000001  
401.49999999999994  
1.2329999999999999  
   
JavaÖеļòµ¥¸¡µãÊýÀàÐÍfloatºÍdouble²»Äܹ»½øÐÐÔËËã¡£²»¹âÊÇJava£¬ÔÚÆäËüºÜ¶à±à³ÌÓïÑÔÖÐÒ²ÓÐÕâÑùµÄÎÊÌâ¡£ÔÚ´ó¶àÊýÇé¿öÏ£¬¼ÆËãµÄ½á¹ûÊÇ׼ȷµÄ£¬µ«ÊǶàÊÔ¼¸´Î£¨¿ÉÒÔ×öÒ»¸öÑ­»·£©¾Í¿ÉÒÔÊÔ³öÀàËÆÉÏÃæµÄ´íÎó¡£ÏÖÔÚÖÕÓÚÀí½âΪʲôҪÓÐBCDÂëÁË¡£  
Õâ¸öÎÊÌâÏ൱ÑÏÖØ£¬Èç¹ûÄãÓÐ9.999999999999Ôª£¬ÄãµÄ¼ÆËã»úÊDz»»áÈÏΪÄã¿ÉÒÔ¹ºÂò10ÔªµÄÉÌÆ·µÄ¡£  
ÔÚÓеıà³ÌÓïÑÔÖÐÌṩÁËרÃŵĻõ±ÒÀàÐÍÀ´´¦ÀíÕâÖÖÇé¿ö£¬µ«ÊÇJavaûÓС£ÏÖÔÚÈÃÎÒÃÇ¿´¿´ÈçºÎ½â¾öÕâ¸öÎÊÌâ¡£  
   
     
   
ËÄÉáÎåÈë  
ÎÒÃǵĵÚÒ»¸ö·´Ó¦ÊÇ×öËÄÉáÎåÈë¡£MathÀàÖеÄround·½·¨²»ÄÜÉèÖñ£Áô¼¸Î»Ð¡Êý£¬ÎÒÃÇÖ»ÄÜÏóÕâÑù£¨±£ÁôÁ½Î»£©£º  
public   double   round(double   value){&


Ïà¹ØÎĵµ£º

Java Type VS Hibernate Type

Java Class Attribute Type         Hibernate Type               Possible SQL Type-Vendor Specific
Integer, int, long short &n ......

Effective Java ѧϰ±Ê¼Ç£¨2£©

 ÓÐʱ£¬ÎÒÃÇÔÚдһ¸ö¹¹Ô캯Êýʱ£¬¾­³£ÒòΪËü°üº¬ÖÚ¶àµÄ²ÎÊý¶ø¿àÄÕ,Õâʱ¿ÉÒÔ¿¼ÂÇÓÃBuilderģʽÀ´´´½¨¶ÔÏó¡£
È磬ÎÒÃÇÒªÉè¼ÆÒ»¸öÓªÑø³É·ÝµÄÀ࣬°üº¬ÄÜÁ¿£¬µ°°×ÖÊ£¬Ö¬·¾£¬¸Æ£¬Ìú£¬Ð¿£¬Î¬ÉúËØA, άÉúËØB1 ... µÈ£¬µ«ÔÚ¹¹ÔìµÄʱºò£¬²»Ò»¶¨Ã¿´Î¶¼ÐèÒªÕâЩ²ÎÊý£¬Èç¸Æ£¬Ìú£¬Ð¿ºÍάÉúËØµÈÊÇ¿ÉÑ¡µÄ£¬ÎªÁËÊÊÓ¦¶àÖÖ¿ÉÄܵĴîÅ䣬±È ......

Java¹ýÂËÆ÷ÑéÖ¤µÇ¼Óû§

1.Ê×ÏÈдһ¸öȨÏÞ¹ýÂËfilterÀà,ʵÏÖFilter½Ó¿Ú
/*Ê×ÏÈдһ¸öȨÏÞ¹ýÂËfilter*/
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import ......

×Ô¶¯Éú³ÉJavaʵÌåÀà

JDBC¶ÁÈ¡Êý¾Ý¿âÔªÊý¾Ý,Éú³ÉJAVAʵÌåÀà
package com.nffish.util;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import com.nffish.c ......

Java Server Pages±í´ïʽÓïÑÔ

¶ÔÓÚ½«ÒªÊ¹ÓõÄJSP¹æ·¶µÄÒ»¸öÌØµã£¬¾ÍÊÇJSP±í´ïʽÓïÑÔ¡£Ôںܴó³Ì¶ÈÉÏ£¬ËüÊÇÓÐÒâ¼ò»¯µÄ£¬²¢¶ÀÁ¢ÓÚJSP¡£
ÔÚJSPµÄÔçÆÚ°æ±¾ÖУ¬Java´úÂëÒԽű¾µÄÐÎʽǶÈëµ½JSPÒ³ÃæÖУ¬ÀýÈ磺
<%
MyBean bean = new MyBean();
String name = bean.getName();
out.println(name);
%>
Õâ¸ö½Å±¾´úÂëн¨ÁËÒ»¸öÃûΪMyBeanµÄʵÀý£¬»ñµÃË ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ