javaÖÐÌæ»»ÎʺÅ
String srt="abc?abc";
str.replaceAll("?", "#");
»áÌáʾÕâÑùµÄ´íÎó
Dangling meta character '?' near index 0
?
^
at java.util.regex.Pattern.error(Unknown Source)
at java.util.regex.Pattern.sequence(Unknown Source)
at java.util.regex.Pattern.expr(Unknown Source)
at java.util.regex.Pattern.compile(Unknown Source)
at java.util.regex.Pattern.<init>(Unknown Source)
at java.util.regex.Pattern.compile(Unknown Source)
at java.lang.String.replaceAll(Unknown Source)
str.replaceAll("[?]", "#");
ÕâÑùд¾Í¿ÉÒÔÁË
Ïà¹ØÎĵµ£º
±¾ÈËÍøÉÏÊÕ¼¯µÄÁ½¸öjava
¼Òô³ÌÐò,ÎÄÕ³ö´¦²»¼ÇµÃÁË.
³ÌÐò1:
import javax.sound.sampled.*;
import javax.swing.JFrame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.Toolkit;
import javax.swing.JPanel;
import java.awt.event.ActionListener;
......
»ùÓÚJavaµÄһЩȨÏÞ¿ò¼Ü¼ò½é
JOSSO
JOSSO(Java Open Single Sign-On)ÊÇÒ»¸ö¿ªÔ´µÄJ2EE-basedµÄSSO(SSO£ºµ¥Ò»µÇ¼¼¼ÊõÊÇÒ»ÖÖÈÏÖ¤ºÍÊÚȨ»úÖÆ£¬ËüÔÊÐí×¢²áÓû§Ö»ÐèÒªÔÚÈÎÒ»³ÉÔ±ÍøÕ¾ÉϵǼһ´Î£¬¶øºóÊÚȨ·ÃÎÊÆäËûÁ¬½ÓµÄ·ÖÖ§ÍøÕ¾£¬ÎÞÐèÔÙ½øÐÐÑéÖ¤µÇ¼)»ù´¡½á¹¹.ËüµÄÄ¿µÄÊÇÌṩһÖÖÓÃÀ´½â¾öÔÚÍ³Ò ......
PATH:
¡¡
ÓÃÀ´Ö¸¶¨ java
ÐéÄâ»ú(JVM) ËùÔÚÔÚĿ¼,Ò²¾ÍÊÇÎÒÃÇ×î³£ÓõÄÓÃÀ´±àÒëjavaÔ´³ÌÐòµÄjavac.exe ºÍÓÃÀ´Ö´ÐÐ *.class ÎļþµÄ
java.exe ÕâÁ½¸öÃüÁî¡£ÒÔÎҵĻúÆ÷ΪÀý°É£ºÎÒµÄ jdk °´×°Ä¿Â¼Îª D:\jdk1.5.0_08£¨È·ÇеÄ˵ÎÒµÄÕâ¸öJDK²»ÊÇ°²×°
°æ±¾µÄ£¬Ö±½Ó½âѹµ½ d:\ Ï嵀 £¬´ËʱÎÒµÄ path ¾ÍÒªÕâÑùÉèpath= ......
ת×Ô http://www.javaeye.com/topic/309457
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
......
InputStream is = new FileInputStream(filename);//ͨ¹ýÎļþÃû³Æ¶ÁÈ¡
»ò
InputStream is =new ByteArrayInputStream(byte[] a);//ͨ¹ýÎļþµÄ×Ö½ÚÊý×é¶ÁÈ¡
BufferedImage buff = ImageIO.read(is);
buff.getWidth();¡¡//µÃµ½Í¼Æ¬µÄ¿í¶È
buff.getHeight(); //µÃµ½Í¼Æ¬µÄ¸ß¶È
is.close(); //¹Ø±ÕStream ......