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

Java Scanner NoSuchElementException

½ñÌìͬѧÎÊÎÒÒ»¸öJavaÎÊÌ⣬´úÂë½á¹¹ÈçÏ£º
Scanner scan = new Scanner(System.in);
scan.next();
scan.close();
scan = new Scanner(System.in);
scan.next(); 
µ±³ÌÐòÔËÐе½µÚÎåÐÐÊÇ»áÅ׳öjava.util.NoSuchElementException
          at java.util.Scanner.throwFor(Scanner.java:838)
          at java.util.Scanner.next(Scanner.java:1347)
ÓÚÊǰ´ÕÕ´íÎóÕ»µÄ¹ì¼£²éÕÒÔ­Òò¡£
¼òÒªµÄ˵£¬¾ÍÊÇǰºóÁ½´ÎʵÀý»¯µÄ²ÎÊýSystem.inÊÇÓÃÒ»¸ö¶ÔÏó£¬ÊÇInputStreamReader¶ÔÏó£¬Ã¿¸ö¸Ã¶ÔÏó°üº¬Ò»¸ö
StreamDecoder ÊµÀý sd
private final StreamDecoder sd;  
¶øscan.close()·½·¨Îª
public void close() {
if (closed)
return;
if (source instanceof Closeable) {
try {
((Closeable)source).close();
} catch (IOException ioe) {
lastException = ioe;
}
}
sourceClosed = true;
source = null;
closed = true;
}  
µ±Ö´Ðе½ ((Closeable)source).close();¾Í»á½øÈëInputStreamReaderµÄclose()·½·¨£º
public void close() throws IOException {
sd.close();
}  
ÕâÀïµÄsd¾ÍÊÇÉÏÃæÌáµ½µÄInputStreamReader¶ÔÏ󣬣¨ÓвéÁËStreamDecoder Ô´´úÂ룬µ«Ã»¸üÉîÈëÏÂÈ¥£©£¬´ËʱsdÒѹرա£
µ±Ö´ÐÐÈç´íÎó²úÉú´úÂëµÄµÚ5ÐдúÂë scan.next()ʱ£¬
public String next() {
ensureOpen();
clearCaches();

while (true) {
String token = getCompleteTokenInBuffer(null);
if (token != null) {
matchValid <mce:script type="text/javascript" src="http://hi.images.csdn.net/js/blog/tiny_mce/themes/advanced/langs/zh.js" mce_src="http://hi.images.csdn.net/js/blog/tiny_mce/themes/advanced/langs/zh.js"></mce:script><mce:script type="text/javascript" src="http://hi.images.csdn.net/js/blog/tiny_mce/plugins/syntaxhl/lan


Ïà¹ØÎĵµ£º

ËÄÄêjavaÑз¢ ѰǶÈëʽְ룬´ýÓö2K¼´¿É£¬±±¾©

±¾È˾ãËÄÄêÑз¢¾­Ñ飨javaµÄ£©
Ë­¸øÎÒÍÆ¼ö·ÝǶÈëʽcְ룬cÓïÑÔһֱûÂäÏ£¬Ñ§µÄ»¹ÐС£¡£¡£ ¹¤×Ê¿ªÎÒ2k¾ÍÐУ¡
ֻΪ³É¹¦´òÈëǶÈëʽÊг¡¡£¡£¡£¸ø¸ö»ú»á°É¡£¡£
ÎÒÕæµÄÊÇÌ«ÏëºÍÄãÃÇ×öͬÐÐÀ²£¡
ÓÐÒâÏòµÄ¿ÉÒÔÁªÏµÎÒ¡£¡£ ÎÒ²»Ìô´ýÓö£¬¶Ô¹¤×÷¾ÍÒ»¸öÒªÇó£¬Ç¶Èëʽ¿ª·¢¡£¡£¡£ ÎÒÓе쬾ÍÊÇ4ÄêµÄjavaÑз¢¾­ÑéºÍc»ù´¡¡£¡£¡£ ÌáÇ ......

¡¾×ª¡¿Java synchronizedÓ÷¨ËѼ¯

ÔÚJavaÖУ¬synchronized¹Ø¼ü×ÖΪ·ÀÖ¹×ÊÔ´³åÍ»ÌṩÁËÖ§³Ö£¬Æä×÷ÓÃÓòÓжþÖÖ£º
ʵÀý·¶Î§¡£
¶ÔÏóʵÀý·¶Î§ÄÚsynchronizedʹÓõÄÁ½ÖÖÐÎʽ£º
ʵÀý·¶Î§Í¬²½·½·¨
publicd class syncTest {

synchronized void aMethod() {
//ÐèҪͬ²½Ê¹ÓõĴúÂë
}

synchronized aMethod(){}¿ÉÒÔ·ÀÖ¹¶à¸öÏß³Ìͬʱ ......

Java iText ¶¯Ì¬ Éú³É PDF Îĵµ ±í¸ñ ÖÐÎÄÎÊÌâ

import java.awt.Color;
import java.io.FileOutputStream;
import com.lowagie.text.Cell;
import com.lowagie.text.Chapter;
import com.lowagie.text.Document;
import com.lowagie.text.Font;
import com.lowagie.text.Image;
import com.lowagie.text.List;
import com.lowagie.text.ListItem;
import com.lo ......

Java±à³ÌÄÇЩʶù102——ÍøÂç±à³Ì¼¼Êõ1

13.2.1 ÍøÂç±à³Ì²½Öè
         °´ÕÕÇ°ÃæµÄ»ù´¡ÖªÊ¶½éÉÜ£¬ÎÞÂÛʹÓÃTCP·½Ê½»¹ÊÇUDP·½Ê½½øÐÐÍøÂçͨѶ£¬ÍøÂç±à³Ì¶¼ÊÇÓɿͻ§¶ËºÍ·þÎñÆ÷¶Ë×é³É¡£µ±È»£¬B/S½á¹¹µÄ±à³ÌÖÐÖ»ÐèҪʵÏÖ·þÎñÆ÷¶Ë¼´¿É¡£ËùÒÔ£¬ÏÂÃæ½éÉÜÍøÂç±à³ÌµÄ²½Öèʱ£¬¾ùÒÔC/S½á¹¹Îª»ù´¡½øÐнéÉÜ¡£
     ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ