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

java³éÏóÀàºÍ³éÏó·½·¨

³éÏóÀà¾ÍÊDz»ÄÜʹÓÃnew·½·¨½øÐÐʵÀý»¯µÄÀ࣬¼´Ã»ÓоßÌåʵÀý¶ÔÏóµÄÀà¡£³éÏóÀàÓеãÀàËÆ“Ä£°å”µÄ×÷Óã¬Ä¿µÄÊǸù¾ÝÆä¸ñʽÀ´´´½¨ºÍÐÞ¸ÄеÄÀà¡£¶ÔÏó²»ÄÜÓɳéÏóÀàÖ±½Ó´´½¨£¬Ö»¿ÉÒÔͨ¹ý³éÏóÀàÅÉÉú³öеÄ×ÓÀ࣬ÔÙÓÉÆä×ÓÀàÀ´´´½¨¶ÔÏó¡£µ±Ò»¸öÀà±»ÉùÃ÷Ϊ³éÏóÀàʱ£¬ÒªÔÚÕâ¸öÀàÇ°Ãæ¼ÓÉÏÐÞÊηûabstract¡£
    ÔÚ³éÏóÀàÖеijÉÔ±·½·¨¿ÉÒÔ°üÀ¨Ò»°ã·½·¨ºÍ³éÏó·½·¨¡£³éÏó·½·¨¾ÍÊÇÒÔabstractÐÞÊεķ½·¨£¬ÕâÖÖ·½·¨Ö»ÉùÃ÷·µ»ØµÄÊý¾ÝÀàÐÍ¡¢·½·¨Ãû³ÆºÍËùÐèµÄ²ÎÊý£¬Ã»Óз½·¨Ì壬Ҳ¾ÍÊÇ˵³éÏó·½·¨Ö»ÐèÒªÉùÃ÷¶ø²»ÐèҪʵÏÖ¡£µ±Ò»¸ö·½·¨Îª³éÏó·½·¨Ê±£¬Òâζ×ÅÕâ¸ö·½·¨±ØÐë±»×ÓÀàµÄ·½·¨ËùÖØÐ´£¬·ñÔòÆä×ÓÀàµÄ¸Ã·½·¨ÈÔÈ»ÊÇabstractµÄ£¬¶øÕâ¸ö×ÓÀàÒ²±ØÐëÊdzéÏóµÄ£¬¼´ÉùÃ÷Ϊabstract¡£
    ³éÏóÀàÖв»Ò»¶¨°üº¬³éÏó·½·¨£¬µ«Êǰüº¬³éÏó·½·¨µÄÀàÒ»¶¨Òª±»ÉùÃ÷Ϊ³éÏóÀà¡£³éÏóÀà±¾Éí²»¾ß±¸Êµ¼ÊµÄ¹¦ÄÜ£¬Ö»ÄÜÓÃÓÚÅÉÉúÆä×ÓÀà¡£³éÏóÀàÖпÉÒÔ°üº¬¹¹Ôì·½·¨£¬µ«Êǹ¹Ôì·½·¨²»Äܱ»ÉùÃ÷Ϊ³éÏó¡£
    ³éÏóÀ಻ÄÜÓÃfinalÀ´ÐÞÊΣ¬¼´Ò»¸öÀ಻ÄܼÈÊÇ×îÖÕÀàÓÖÊdzéÏóÀà¡£
    abstract²»ÄÜÓëprivate¡¢static¡¢final¡¢native²¢ÁÐÐÞÊÎͬһ¸ö·½·¨¡£
    ³ÌÐò¾ÙÀý£º
abstract class Animal    //¶¨Òå³éÏóÀà
{
    String str;
    Animal(String s)     //¶¨Òå³éÏóÀàµÄÒ»°ã·½·¨
   {
        str=s;
   }
    abstract void eat();      //¶¨Òå³éÏó·½·¨
}
class Horse extends Animal     //¶¨Òå¼Ì³ÐAnimalµÄ×ÓÀà
{  
    String str;
    Horse(String s)
   {
      super(s);      //µ÷Óø¸ÀàµÄ¹¹Ôì·½·¨
   }
    void eat()      //ÖØÐ´¸¸ÀàµÄ³éÏó·½·¨
   {     
      System.out.println("Âí³Ô²ÝÁÏ£¡");
   }
}
class Dog extends Animal
{
    String str;
    Dog(String s)
   {
   &nb


Ïà¹ØÎĵµ£º

java»ù´¡ÖªÊ¶ÈýÊ®¶þ¼Æ


      µÚÒ»£¬Ì¸Ì¸final£¬ finally£¬ finalizeµÄÇø±ð¡£
¡¡¡¡final ÓÃÓÚÉùÃ÷ÊôÐÔ£¬·½·¨ºÍÀ࣬·Ö±ð±íʾÊôÐÔ²»¿É±ä£¬·½·¨²»¿É¸²¸Ç£¬À಻¿É¼Ì³Ð¡£finallyÊÇÒì³£´¦ÀíÓï¾ä½á¹¹µÄÒ»²¿·Ö£¬±íʾ×ÜÊÇÖ´ÐС£finalizeÊÇObjectÀàµÄÒ»¸ö·½·¨£¬ÔÚÀ¬»øÊÕ¼¯Æ÷Ö´ÐеÄʱºò»áµ÷Óñ»»ØÊÕ¶ÔÏóµÄ´Ë·½·¨£¬¿ÉÒÔ¸²¸Ç ......

javaÑéÖ¤Âë»ã×Ü

1.Éú³ÉgifͼƬ¸ñʽµÄ
package com.cssweb.common.util;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
/*
* ¹¦ÄÜ£ºµ÷ÓÃAuthServlet¿ÉÒÔÉú³ÉÒ»¸öÑéÖ¤ÂëͼƬ,ͼƬµÄ¿í¶ÈºÍ¸ß¶È¿ÉÒ ......

¡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 ¸´Ï°±Ê¼Ç_µÚ1Ìì

 
·½·¨µÄÖØÔØ
£ºÍ¬Ò»¸öÀàÀïÃæ·½·¨µÄÃû×ÖÏàͬ£¬·½·¨µÄ²ÎÊýÏÖ÷ÒªÊDzÎÊýÀàÐÍ£¬²ÎÊý¸öÊý£©
²»Í¬
,
·µ»ØÀàÐÍ¿ÉÄܲ»Í¬¡£
      
  
        
ÖØÔØ·½·¨¿ÉÒÔ¾ßÓв»Í¬µÄ·µ»ØÀàÐÍ£¬µ«·µ»ØÀàÐͱ¾Éí²»×ãÒÔÇø·Ö·½·¨µÄÁ½¸ö°æ
±¾¡£ ......

javaÎļþ¹ýÂËÆ÷µÄʹÓÃ

javaÎļþ¹ýÂËÆ÷µÄʹÓôúÂëÈçÏ£º
²âÊÔ´úÂ룺package file;
import java.io.File;
public class fileFilter {
 public static void main(String[] args) {
  File file = new File("d:\\");//ÉèÖÃÎļþ·¾¶
  for (File fileList : file.listFiles(new file.MyFileFilter())) {
   ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ