´«ÖDz¥¿Íjavaѧϰ4
½ñÌìÎÒѧϰÁË·´ÉäÓë¶àÏ̵߳Ä֪ʶ
·´É䣺Class cls1=Date.class//×Ö½ÚÂë1£»
Class cls2=Person.class//×Ö½ÚÂë2£»
P1.getClass();//µÃµ½×Ö½ÚÂë
Class.forName(“java.lang.String”) //µÃµ½Õâ¸öÀàµÄ×Ö½ÚÂë
ºǫ́Ïß³ÌÓëÁªºÏÏß³Ì
l Èç¹ûÎÒÃǶÔij¸öÏ̶߳ÔÏóÔÚÆô¶¯£¨µ÷ÓÃstart·½·¨£©Ö®Ç°µ÷ÓÃÁËsetDaemon£¨true£©·½·¨£¬Õâ¸öÏ߳̾ͱä³ÉÁ˺ǫ́Ï̡߳£
l ¶ÔJava³ÌÐòÀ´Ëµ£¬Ö»Òª»¹ÓÐÒ»¸öǰ̨Ïß³ÌÔÚÔËÐУ¬Õâ¸ö½ø³Ì¾Í²»»á½áÊø£¬Èç¹ûÒ»¸ö½ø³ÌÖÐÖ»Óкǫ́Ïß³ÌÔËÐУ¬Õâ¸ö½ø³Ì¾Í»á½áÊø¡£
l pp.join£¨£©µÄ×÷ÓÃÊǰÑppËù¶ÔÓ¦µÄÏ̺߳ϲ¢µ½µ÷ÓÃpp.join£¨£©£»Óï¾äµÄÏß³ÌÖС£
ʹÓÃRunnable½Ó¿Ú´´½¨¶àÏß³Ì
l Êʺ϶à¸öÏàͬ³ÌÐò´úÂëµÄÏß³ÌÈ¥´¦Àíͬһ×ÊÔ´µÄÇé¿ö£¬°ÑÐéÄâcpu£¨Ị̈߳©Í¬³ÌÐòµÄ´úÂë¡¢Êý¾ÝÓÐЧ·ÖÀ룬½ÏºÃµØÌåÏÖÁËÃæÏò¶ÔÏóµÄÉè¼ÆË¼Ïë¡£
l ¿ÉÒÔ±ÜÃâÓÉÓÚJavaµÄµ¥¼Ì³ÐÌØÐÔ´øÀ´µÄ¾ÖÏÞ¡£ÎÒÃǾ³£Åöµ½ÕâÑùÒ»ÖÖÇé¿ö£¬¼´µ±ÎÒÃÇÒª½«ÒѾ¼Ì³ÐÁËijһ¸öÀàµÄ×ÓÀà·ÅÈë¶àÏß³ÌÖУ¬ÓÉÓÚÒ»¸öÀ಻ÄÜͬʱÓÐÁ½¸ö¸¸À࣬ËùÒÔ²»ÄÜÓü̳ÐThreadÀàµÄ·½Ê½£¬ÄÇô£¬Õâ¸öÀà¾ÍÖ»ÄܲÉÓÃʵÏÖRunnable¡£
l µ±Ï̱߳»¹¹Ôìʱ£¬ÐèÒªµÄ´úÂëºÍÊý¾Ýͨ¹ýÒ»¸ö¶ÔÏó×÷Ϊ¹¹Ô캯Êýʵ²Î´«µÝ½øÈ¥£¬Õâ¸ö¶ÔÏó¾ÍÊÇÒ»¸öʵÏÖÁËRunnable½Ó¿ÚµÄÀàµÄʵÀý¡£
l ÊÂʵÉÏ£¬¼¸ºõËùÓжàÏß³ÌÓ¦Óö¼¿ÉÒÔÓÃRunnable½Ó¿Ú·½Ê½¡£
ÀýÈ磺ÓÐËĸö´°¿ÚÏúÊÛ100ÕÅ»ð³µÆ±£¬
Class TestThread implements Runnable//ʹÓÃʵÏÖRunnable½Ó¿ÚµÄ·½Ê½£¬ÊµÏÖ´úÂëºÍÊý¾ÝµÄ·ÖÀë
{
int tickets=100;
public void run()
{
While(true)
{
If(tickets>0)
System.out.println(Thread.currentThread().getName()+”in salling ticket”+tickets--);
//Ëĸö´°¿ÚͬʱÂô£¬Ï൱ÓÚËĸö½ø³Ì¹²Ïítickets±äÁ¿£»Ëĸö½ø³Ì¹²Í¬Ê¹ÓÃÕâÒ»¶Î´úÂë
}
}
}
Public class Test{
&n
Ïà¹ØÎĵµ£º
javaÖÐËùÓж¼ÊÇunicodeµÄ±àÂ룬¿ÖÅ´ó¼Ò¶¼Çå³þ£¬µ«ÊÇÕâ¾ßÌåÊÇÄÄÀïµÄ±àÂë¡£ÔÚһ̨ÖÐÎÄwindows²Ù×÷ϵͳ£¨GBK£©£¬»òÓ¢ÎĵÄlinux²Ù×÷ϵͳÏ£¨ISO-8859-1£©Ï£¬ÕâЩ±àÂëÊÇÈçºÎת»»µÄ¡£JAVAÖеÄStringÀàµÄgetBytes()·½·¨ºÍStringÀàµÄÖ¸¶¨±àÂ뷽ʽµÄ¹¹Ô캯ÊýÖеıàÂëÓÖÊÇÈçºÎÄØ£¿
ÕâÀïÎÒ²»×öÉîÈë½âÊÍ£¬Ö»ÊÇչʾһÏÂÕâЩ±àÂë ......
javaÖеľ²Ì¬´úÀíÓ붯̬´úÀí
±¾À´´òËã½ñÌìдµãjpa·½ÃæµÄ¶«Î÷£¬½á¹û¸ãÉÏÁË´úÀí£¬Ë÷ÐԾͰÑÑо¿³É¹û·Å³öÀ´°É£¬javaÖеĴúÀíÓÐÁ½ÖÖÒ»ÖÖÊǾ²Ì¬´úÀíÒ»ÖÖÊǶ¯Ì¬´úÀí£¬¾²Ì¬´úÀíÆäʵºÜÈÝÒ×Àí½â£¬¾²Ì¬´úÀíÆäʵ¾ÍÊǸö×°ÊÎÆ÷¶øÒÑ£¬¶ø¶¯Ì¬´úÀíÔò½èÖúÓÚjvmµÄÖ§³Ö£¬ÔÚÔËÐÐʱ¶¯Ì¬Éú³É´úÀíÀà¡£
ÔÚÕ ......
1¡¢Oracle8/8i/9iÊý¾Ý¿â£¨thinģʽ£©
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
String url="jdbc:oracle:thin:@localhost:1521:orcl";
//orclΪÊý¾Ý¿âµÄSID
String user="test";
String password="test";
Connection conn= DriverManager.getConnection(url,user,password);
2¡¢DB2 ......
package com.wepull.jbs.lesson4;
import java.util.Random;
/**
* ÅÅÐò²âÊÔÀà
*
* ÅÅÐòËã·¨µÄ·ÖÀàÈçÏ£º
* 1.²åÈëÅÅÐò£¨Ö±½Ó²åÈëÅÅÐò¡¢ÕÛ°ë²åÈëÅÅÐò¡¢Ï£¶ûÅÅÐò£©£»
* 2.½»»»ÅÅÐò£¨Ã°ÅÝÅÝÅÅÐò¡¢¿ìËÙÅÅÐò£©£»
* 3.Ñ¡ÔñÅÅÐò£¨Ö±½ÓÑ¡ÔñÅÅÐò¡¢¶ÑÅÅÐò£©£»
......
C++ÓëJavaÒìͬ
1¡¢Ö¸Õë¡ï¡ï¡ï¡ï¡ï
C C++ÖеÄÖ¸Õ룬ÌṩÁ˺ܴóµÄÁé»îÐÔ£¬µ«ÊÇÁé»îÒ²´øÀ´ÁËΣÏÕ£¬¶ÔÖ¸Õë²Ù×÷µÄ²»µ±ÈÝÒ×Ôì³ÉÄÚ´æÐ¹Â¶»òÊÇ¿ÕÐüÖ¸ÕëµÈÎÊÌâ¡£
JavaÈ¡ÏûÁËÖ¸Õë¡£µ«Êµ¼ÊÉÏ£¬javaÖÐÉùÃ÷µÄËùÓÐÒýÓÃÊý¾ÝÀàÐ͵ÄÃû³Æ£¬¿ÉÒÔÀí½âΪ¾ÍÊÇÒ»¸öÖ¸Õë¡£¸ÃÃû³Æ´æ´¢ÔÚÕ»ÄÚ´æÉÏ£¬Ö¸Ïò¶ÔÄÚ´æÉÏʹÓÃnew¿ª±ÙµÄ¿Õ¼ä¡£
È磺
int[] ......