JavaÖÐÆæ¹Ö¶øÓÖÎ޿ɺñ·ÇµÄÀà¼ÓÔØË³Ðò
×òÌì¿´µ½ÕâÑùһƪÌû×Ó£¬ÌÖÂÛÀà¼ÓÔØË³ÐòµÄ£¬Ò²¿ÉÒÔ˵Êdzõʼ»¯Ë³ÐòµÄ£¬½ñÌìÔçÉÏÕÒ²»µ½ÁË£¬±¾À´Ïë»Ø¸´µÄ£¬ÏÖÔÚ×Ô¼ºÐ´²©¿Í»Ø¸´ÁË£¬ºÇºÇ
public class Singleton {
private static Singleton obj = new Singleton();
public static int counter1 ;
public static int counter2 = 0;
private Singleton()
{
counter1++;
counter2++;
}
public static Singleton getInstance()
{
return obj;
}
public static void main(String[] args) {
Singleton.getInstance();
System.out.println("obj.counter1=="+counter1);
System.out.println("obj.counter2=="+counter2);
}
}
ÎÒ²»Á˽âΪʲôobj.counter1=1£¬obj.counter2=0.Ï£Íû¸øÎÒ˵˵
¸Õ¿ªÊ¼Ò²ºÜÃÔ㣬ÎÒÏ벻ͨµÄÎÊÌâÊÇʲôʱºòÉùÃ÷µÄ±äÁ¿count1¡¢count2£¿
ÒÔǰµÄÀí½âËüµÄÖ´ÐÐ˳ÐòÓ¦¸ÃÊÇÕâÑùµÄ:
1¡¢¼ÓÔØÀ࣬µ±È»Ê×ÏÈÖ´ÐеÄÊÇ
private static Singleton obj = new Singleton();
2¡¢ËùÒÔ³öÏÖÁ˶ÔÖжÔÏóµÄ´´½¨£¬ÓÚÊÇÖ´Ðй¹Ôì·½·¨£º
private Singleton()
{
counter1++;
counter2++;
}
3¡¢°´ÕÕ˳Ðò£¬Ó¦¸ÃÖ´ÐÐÏÂÒ»ÌõÓï¾ä£¬¼´£º
public static int counter1 ;
public static int counter2 = 0;
ºÃÁË£¬ÀàµÄ¼ÓÔØ¹ý³ÌÍê³ÉÁË¡£
ÏÖÔڲſªÊ¼Ö´ÐÐmain·½·¨µÄµÚÒ»ÌõÓï¾ä£¬ËæºóµÄ½áÂÛ¶¼³ÉÁ¢ÁË¡£
ÏÖÔÚµÄÎÊÌâ³öÏÖÁË£ºÊ²Ã´Ê±ºòÉùÃ÷µÄ±äÁ¿count1¡¢count2£¿
²éѯÁËһЩ×ÊÁÏ£¬ÖÕÓÚ½â¾öÁË£¬ÎÒÈÏΪӦ¸ÃÊÇÕâÑùµÄ£º
Àà¼ÓÔØµÄ˳ÐòÆäʵÒÔÉϵÄ˵·¨ÊÇÓÐÎóµÄ£¬Ò²¾ÍÊÇÒÔǰµÄÀí½âÊÇ´æÔÚÆ«²îµÄ£¬³ý·Ç³öÏÖÏëÎÄÕÂÕâÑùµÄ³ÌÐò²Å»á±©Â¶³öÀ´¡£ºÃÁË£¬·Ï»°ÉÙ˵£¬¿´¿´ÕæÕýµÄÀà¼ÓÔØË³Ðò£º
Àà¼ÓÔØ·ÖΪÈý¸ö¹ý³Ì£º×°ÔØ¡¢Á´½Ó¡¢³õʼ»¯¡£
×°ÔØµÄ¹ý³Ì¾ÍÊǽ«classÎļþ¶ÁÈëÄÚ´æµÄ¹ý³Ì£¬²¢ÇÒÌáÈ¡ÆäÖеÄÀà¹Ø¼üÐÅÏ¢£¬±ÈÈ磺·½·¨¡¢±äÁ¿µÈµÈ¡£
¶øÔÚÁ´½ÓÖдæÔÚÈý¸ö²½Ö裺
a¡¢½øÐÐ×Ö½ÚÂëµÄ¼ì²é£¬¿´ÊÇ·ñ·ûºÏclassÎļþ¹æ·¶£»
b¡¢¶ÔÀàÖеÄÀà±äÁ¿½øÐзÖÅä¿Õ¼ä£¬¸½³õʼֵ¡£´Ë´¦×¨Ö¸»ù±¾ÀàÐÍ¡£
c¡¢¶ÔÀàÖеÄÒýÓñäÁ¿½øÐзÖÅä¿Õ¼ä
Ïà¹ØÎĵµ£º
Java ÓïÑÔÊÇÒ»ÖÖ¾ßÓж¯Ì¬ÐԵĽâÊÍÐͱà³ÌÓïÑÔ£¬µ±Ö¸¶¨³ÌÐòÔËÐеÄʱºò£¬ Java ÐéÄâ»ú¾Í½«±àÒëÉú³ÉµÄ . class Îļþ°´ÕÕÐèÇóºÍÒ»¶¨µÄ¹æÔò¼ÓÔØ½øÄڴ棬²¢×éÖ¯³ÉΪһ¸öÍêÕûµÄ Java Ó¦ÓóÌÐò¡£ Java ÓïÑÔ°Ñÿ¸öµ¥¶ÀµÄÀà Class ºÍ½Ó¿Ú Implements ±àÒë³Éµ¥¶ÀµÄÒ»¸ö . class Îļþ£¬ÕâЩÎļþ¶ÔÓÚ Java ÔËÐл·¾³À´Ëµ¾ÍÊÇÒ»¸ö¸ö¿ÉÒÔ¶¯Ì¬ ......
package com.flxx.docUrl;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jd ......
¶àÏ̶߳Áдͬһ¸ö¶ÔÏóµÄÊý¾ÝÊÇºÜÆÕ±éµÄ£¬Í¨³££¬Òª±ÜÃâ¶Áд³åÍ»£¬±ØÐë±£Ö¤ÈκÎʱºò½öÓÐÒ»¸öÏß³ÌÔÚдÈ룬ÓÐÏß³ÌÕýÔÚ¶ÁÈ¡µÄʱºò£¬Ð´Èë²Ù×÷¾Í±ØÐëµÈ´ý¡£¼òµ¥Ëµ£¬¾ÍÊÇÒª±ÜÃâ“д-д”³åÍ»ºÍ“¶Á-д”³åÍ»¡£µ«ÊÇͬʱ¶ÁÊÇÔÊÐíµÄ£¬ÒòΪ“¶Á-¶Á”²»³åÍ»£¬¶øÇҺܰ²È«¡£
ҪʵÏÖÒÔÉϵÄReadWriteLock£¬ ......
µ±Á½¸ö½ø³ÌÔÚ½øÐÐÔ¶³ÌͨÐÅʱ£¬±Ë´Ë¿ÉÒÔ·¢Ë͸÷ÖÖÀàÐ͵ÄÊý¾Ý¡£ÎÞÂÛÊǺÎÖÖÀàÐ͵ÄÊý¾Ý£¬¶¼»áÒÔ¶þ½øÖÆÐòÁеÄÐÎʽÔÚÍøÂçÉÏ´«ËÍ¡£·¢ËÍ·½ÐèÒª°ÑÕâ¸öJava¶ÔÏóת»»Îª×Ö½ÚÐòÁУ¬²ÅÄÜÔÚÍøÂçÉÏ´«ËÍ£»½ÓÊÕ·½ÔòÐèÒª°Ñ×Ö½ÚÐòÁÐÔÙ»Ö¸´ÎªJava¶ÔÏó¡£
¡¡¡¡°ÑJava¶ÔÏóת»»Îª×Ö½ÚÐòÁеĹý³Ì³ÆÎª¶ÔÏóµÄÐòÁл¯¡£
¡¡¡¡°Ñ×Ö½ÚÐòÁлָ´ÎªJava¶ÔÏóµÄ¹ ......
ʹÓÃjavaÖеĶ¯Ì¬´úÀí¿ÉÒÔÍê³ÉºÜ¶àÊÂÇ飬±ÈÈ罫ҵÎñʵÀý½øÐÐÍйܣ¬ÊµÏÖAOPµÈ£¬µ«ÊÇPhpÖÐûÓÐʵÏÖÕâÑùµÄ¶«Î÷£¬×òÌìͻȻÏëµ½Æäʵ¿ÉÒÔͨ¹ýevalÀ´Ä£ÄâÒ»¸ö¶¯Ì¬´úÀí»úÖÆ¡£php±Èjava²»Í¬µÄÊÇ£¬phpÊDz»ÐèÒª±àÒëµÄ£¬Òò´ËÖ»ÒªÎÒÃÇÄܹ»¶¯Ì¬Éú³ÉÒ»¶Î´úÂ룬ȻºóÓÃevalÀ´Ö´ÐоͿÉÒԴﵽЧ¹û¡£´úÂëÈçÏ£º
/**
* ´úÀíʵÏÖÀà
*/
inter ......