Effective Java¶ÁÊé±Ê¼Ç
package chape8;
/**
* µÚ8ÕÂ
* µÚ46條£º
* for-eachÑ環優ÏÈÓÚforÑ環
* for(Element e : c)
* {
* dosomthing(e);
* }
* Õâ¸öÊÇjava1.5ÒÔÉϵİ汾µÄforÑ»·µÄÊ×ÏÈ¿¼ÂǵÄд·¨
* ÒÔÏÂÊÇjava1.5ÒÔǰµÄ寫·¨
* for (Iterator it = c.iterator();it.hasNext();)
{
it.next();
}
這兩個Ñ環µÄ·½·¨¶¼±Èwhile·½·¨ÒªºÃ£¬45條ÖеÄ複製µÄ錯誤ÔÚÓõÚÒ»種Ñ環¾Í
¿ÉÒÔ±ÜÃ⣻
總Ö®for eachÔÚ簡潔ºÍ預·Àbug·½ÃæÓÐÖø傳統µÄforÑ環無·¨±ÈµÄ優勢£»並ÇÒ沒ÓÐÐÔÄÜ
損ʧ¡£應該¾¹¿ÉÄÜʹÓÃfor-each µ«ÊÇÓÐÏÂ麵Èý種Çé況無·¨Ê¹ÓÃfor each
1.過濾£ºÈç¹û±éÀúÒ»¸ö¼¯ºÏ ²¢É¾³ýÑ¡¶¨µÄÔªËØ ¾ÍÒªÓÃÏÔʾµÄµü´úÆ÷£¬ÕâÑù¿ÉÒÔµ÷ÓÃ
ËûµÄremove·½·¨
2.ת»»£ºÒª±éÀúÁбí»òÕßÊý×é ²¢È¡´úËûµÄ²¿·Ö»òÕßÈ«²¿ÔªËØÖµ ÒªÓõ½Êý×éµÄË÷Òý
3.ƽÐеü´úÒª²¢ÐбéÀú¶à¸ö¼¯ºÏ£»
* @author lee
*
*/
public class Chape46 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}
Ïà¹ØÎĵµ£º
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJ ......
Java NIO APIÏê½â
ÔÚJDK
1.4ÒÔǰ£¬JavaµÄIO²Ù×÷¼¯ÖÐÔÚjava.ioÕâ¸ö°üÖУ¬ÊÇ»ùÓÚÁ÷µÄ×èÈû£¨blocking£©API¡£¶ÔÓÚ´ó¶àÊýÓ¦ÓÃÀ´Ëµ£¬ÕâÑùµÄAPIʹÓúܷ½
±ã£¬È»¶ø£¬Ò»Ð©¶ÔÐÔÄÜÒªÇó½Ï¸ßµÄÓ¦Óã¬ÓÈÆäÊÇ·þÎñ¶ËÓ¦Óã¬ÍùÍùÐèÒªÒ»¸ö¸üΪÓÐЧµÄ·½Ê½À´´¦ÀíIO¡£´ÓJDK 1.4Æð£¬NIO
API×÷Ϊһ¸ö»ùÓÚ»º³åÇø£¬²¢ÄÜÌṩ·Ç×èÈû(non-blo ......
3.package com.ncs.opts.tools;
import java.util.HashMap;
import java.util.Map;
import com.ncs.opts.common.icp.dao.po.audit.IcpMainHistory;
import com.ncs.opts.common.icp.dao.po.audit.IcpModifyHistory;
import com.ncs.opts.common.icp.dao.po.audit.IcpSiteAccessHistory;
import com.ncs.opts.common.i ......
Java¸ß¼¶££JavaÏß³ÌÔËÐÐÕ»ÐÅÏ¢µÄ»ñÈ¡
·¢²¼Ê±¼ä£º2007.11.14 05:10 À´Ô´£ºÈüµÏÍø¼¼ÊõÉçÇø ×÷Õߣºbaocl
Ò»¡¢ÎÊÌâµÄÒýÈë
ÎÒÃÇÔÚJava³ÌÐòÖÐʹÓÃÈÕÖ¾¹¦ÄÜ£¨JDK Log»òÕßLog4J£©µÄʱºò£¬»á·¢ÏÖLogϵͳ»á×Ô¶¯°ïÎÒÃÇ´òÓ¡³ö·á¸»µÄÐÅÏ¢£¬¸ñʽһ°ãÈçÏ£º
[ÔËÐÐʱ¼ä] [µ ......
from: http://blog.csdn.net/WOSHISUNXIANGFU/archive/2008/08/25/2828634.aspx
1.½éÉÜ
1£©DOM£¨JAXP Crimson½âÎöÆ÷£©
DOMÊÇÓÃÓëÆ½Ì¨ºÍÓïÑÔÎ޹صķ½Ê½±íʾXMLÎĵµµÄ¹Ù·½W3C±ê×¼¡£DOMÊÇÒÔ²ã´Î½á¹¹×éÖ¯µÄ½Úµã»òÐÅϢƬ¶ÏµÄ¼¯ºÏ¡£Õâ¸ö²ã´Î½á¹¹ÔÊÐí¿ª·¢ÈËÔ±ÔÚÊ÷ÖÐѰÕÒÌØ¶¨ÐÅÏ¢¡£·ÖÎö¸Ã½á¹¹Í¨³£ÐèÒª¼ÓÔØÕû¸öÎĵµ ......