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

Java·´Éä2

1.2.3.ConstructorÀࣺ
ConstructorÀà´ú±íij¸öÀàµÄÒ»¸ö¹¹Ôì·½·¨¡£
µÃµ½Ä³¸öÀàËùÓеĹ¹Ôì·½·¨£º
Constructor[]  constructor = Class.forName(“java.lang.String”).getConstructor();
µÃµ½Ä³Ò»¸ö¹¹Ôì·½·¨£º
Constructor  constructor =
Class.forName(“java.lang.String”).getConstructor(StringBuffer.class);
´´½¨ÊµÀý¶ÔÏó£ºString str2 = (String)constructor1.newInstance(new StringBuffer("abc"));
1.2.4.FieldÀࣺ
Field´ú±íij¸öÀàµÄÒ»¸ö³ÉÔ±±äÁ¿¡£ÌṩÓйØÀà»ò½Ó¿ÚµÄÊôÐÔµÄÐÅÏ¢£¬ÒÔ¼°¶ÔËüµÄ¶¯Ì¬·ÃÎÊȨÏÞ¡£·´ÉäµÄ×ֶοÉÄÜÊÇÒ»¸öÀࣨ¾²Ì¬£©ÊôÐÔ»òʵÀýÊôÐÔ£¬¼òµ¥µÄÀí½â¿ÉÒÔ°ÑËü¿´³ÉÒ»¸ö·â×°·´ÉäÀàµÄÊôÐÔµÄÀà¡£
public void setAccessible(boolean flag)
ÉèÖÃÊÇ·ñÓÐȨÏÞ·ÃÎÊ·´ÉäÀàÖеÄ˽ÓÐÊôÐԵģ¬Ö»ÓÐÉèÖÃΪtrueʱ²Å¿ÉÒÔ·ÃÎÊ£¬Ä¬ÈÏΪfalse¡£
public void set(Object obj,Object value)
ÉèÖÃÖ¸¶¨ÊôÐÔµÄÖµ¡£
public Object get(Object obj)
µÃµ½ÊôÐÔµÄÖµ
 
ÎÊÌ⣺µÃµ½µÄField¶ÔÏóÊǶÔÓ¦µ½ÀàÉÏÃæµÄ³ÉÔ±±äÁ¿£¬»¹ÊǶÔÓ¦µ½¶ÔÏóÉϵijÉÔ±±äÁ¿£¿ÀàÖ»ÓÐÒ»¸ö£¬¶ø¸ÃÀàµÄʵÀý¶ÔÏóÓжà¸ö£¬Èç¹ûÊÇÓë¶ÔÏó¹ØÁª£¬ÄǹØÁªµÄÊÇÄĸö¶ÔÏóÄØ£¿
²âÊÔ´úÂ룺
public class ReflectPoint {
    private int x;
    public int y;
    public ReflectPoint(int x, int y) {
       this.x = x;
       this.y = y;
    }
public int getX() {
       return x;
    }
    public void setX(int x) {
       this.x = x;
    }
    public int getY() {
       return y;
    }
    public void setY(int y) {
       this.y = y;
    }
}
²âÊÔ´úÂ룺
       ReflectPoint pt1 = new ReflectPoint(3,5);
       Field fieldY = pt1.getClass().getField("y");
       //fieldYµÄÖµÊǶàÉÙ£¿ÊÇ5,´í£¡fieldY²»ÊǶÔÏóÉíÉϵıäÁ


Ïà¹ØÎĵµ£º

javaʹÓÃrocksawºÍvserv tcpipʵÏÖ»ùÓÚICMPµÄPing¹¦ÄÜ

Ò»£º×¼±¸ www.savarese.org download
 1.  rocksaw-1.0.0-src.tar.gz
 2.  vserv-tcpip-0.9.2-src.tar.gz
¶þ£º±àÒëÔ´ÎļþµÃµ½jar°ü ʹÓÃAnt
 1.  build vserv-tcpip-0.9.2-src
      ÔÚvserv-tcpip-0.9.2Ŀ¼ÏÂÃæ½¨Ò»¸ötestsĿ¼£¬È»ºóÔÚcmd´°¿ÚϽøÈë ......

Java ÃæÊÔÖеÄÏÝÚå

µÚÒ»£¬Ì¸Ì¸final, finally, finalizeµÄÇø±ð¡£
×î³£±»Îʵ½¡£
µÚ¶þ£¬Anonymous Inner Class (ÄäÃûÄÚ²¿Àà) ÊÇ·ñ¿ÉÒÔextends(¼Ì³Ð)ÆäËüÀ࣬ÊÇ·ñ¿ÉÒÔimplements(ʵÏÖ)interface(½Ó¿Ú)?
µÚÈý£¬Static Nested Class ºÍ Inner ClassµÄ²»Í¬£¬ËµµÃÔ½¶àÔ½ºÃ(ÃæÊÔÌâÓеĺÜÁýͳ)¡£
µÚËÄ£¬&ºÍ&&µÄÇø±ð¡£
Õâ¸öÎʵúÜÉÙ¡£ ......

JAVAͨÓÃDao½Ó¿ÚºÍhibernateµÄ¾ßÌåʵÏÖ

»ùÓÚ·ºÐ͵ÄͨÓÃDao½Ó¿Ú£º£¨ÖØÒªÊÇÔÚÓ¦ÓÃhibernate»òJPAʱÔËÓã©
¡¡¡¡package com.qiujy.dao;
¡¡¡¡import java.io.Serializable;
¡¡¡¡import java.util.List;
¡¡¡¡/**
¡¡¡¡* »ùÓÚ·ºÐ͵ÄͨÓÃDao½Ó¿Ú
¡¡¡¡*/
¡¡¡¡public interface GenericDao {
¡¡¡¡void create(T entity);
¡¡¡¡void delete(T entity);
¡¡ ......

javaÃæÊÔÌâ»ã¼¯

JAVAÏà¹Ø»ù´¡ÖªÊ¶
1¡¢ÃæÏò¶ÔÏóµÄÌØÕ÷ÓÐÄÄЩ·½Ãæ   
1.³éÏó£º
³éÏó¾ÍÊǺöÂÔÒ»¸öÖ÷ÌâÖÐÓ뵱ǰĿ±êÎ޹صÄÄÇЩ·½Ã棬ÒÔ±ã¸ü³ä·ÖµØ×¢ÒâÓ뵱ǰĿ±êÓйصķ½Ãæ¡£³éÏó²¢²»´òËãÁ˽âÈ«²¿ÎÊÌ⣬¶øÖ»ÊÇÑ¡ÔñÆäÖеÄÒ»²¿·Ö£¬ÔÝʱ²»Óò¿·Öϸ½Ú¡£³éÏó°üÀ¨Á½¸ö·½Ã棬һÊǹý³Ì³éÏ󣬶þÊÇÊý¾Ý³éÏó¡£
2.¼Ì³Ð£º
¼Ì³ÐÊÇÒ»ÖÖÁª½ ......

³£ÓÃJava Date·½·¨

1.¼ÆËãijһÔ·ݵÄ×î´óÌìÊý
Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year); //year Ϊ int
time.set(Calendar.MONTH,i-1);//×¢Òâ,Calendar¶ÔÏóĬÈÏÒ»ÔÂΪ0          
int day=time.getActualMaximum(Calendar ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ