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class Glyph {
    Glyph(){
        System.out.println("Glyph() before draw()");
        draw();
        System.out.println("Glyph() after draw()");
    }
   
    void draw(){
        System.out.println("Glyph.draw()");
    }
}
class RoundGlyph extends Glyph {
    private int radius = 1;
   
    RoundGlyph(int r){
        radius = r;
        System.out.println("RoundGlyph.RoundGlyph(), radius = " + radius);
    }
   
    void draw(){
        System.out.println("RoundGlyph.draw(), radius = " + radius);
    }
    public static void main(String[] args) {
        new RoundGlyph(5);
    }
}
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Glyph() before draw()
RoundGlyph.draw(), radius = 0
Glyph() after draw()
RoundGlyph.RoundGlyph(), radius = 5
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Java URLClassLoader

Closing a URLClassLoader
By Michael McMahon
 
Complex Java programs, such as application servers, sometimes create their own class loaders using the URLClassLoader type. With URLClassLoader, applications can load classes and resources from a search path of URLs. The following URL types are ......

ͨ¹ý DAOFactory µÄ·ºÐÍд·¨À´ÑÝʾJava·ºÐ͵ÄÌØÊâÓ÷¨

ͨ¹ý DAOFactory µÄ·ºÐÍд·¨À´ÑÝʾJava·ºÐ͵ÄÌØÊâÓ÷¨
СÐÍÏîÄ¿Öг£³£¶¼Ã»ÓÐÓÃÈý·½³Ö¾Ã»¯¿ò¼Ü£¬¶ø´ó¶¼ÊÇÓù«Ë¾»ò×ÔÐÐÒÀ¾ÝDAOģʽ·â×°µÄһЩ×é¼þÀ´Íê³ÉÊý¾Ý¿â³Ö¾Ã»¯¶¯×÷£¬²¢ÇÒ£¬Í¨³£ÎªÁ˸ü¾ß¿ÉÀ©Õ¹ÐÔ£¬³£³£Ê¹ÓóéÏ󹤳§Ä£Ê½À´½âñîºÏ¡£
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±àÕß°´£ºÔçÔÚÉÏÊÀ¼Í90Äê´ú£¬¸÷ÖÖ¹ØÓÚJavaÒÑËÀµÄ¶ÏÑÔ¾ÍÒѾ­¿ªÊ¼³öÏÖ¡£Ê®¶àÄêÖ®ºóµÄ½ñÄ꣬ÕâÑùµÄÑÔÂÛÒÀÈ»²»¾øÓÚ¶ú¡£ÒԹؼü´Ê"java is dead"ÔÚGoogleÖÐËÑË÷£¬µÃµ½´óÔ¼199,000Ìõ½á¹û£¬Óɴ˿ɼû²»ÉÙÈËд¹ý»òÆÀÂÛ¹ýJavaµÄËÀÍö¡£Õë¶ÔÕâÃÅÒÑËÀÊ®¶àÄêµÄÓïÑÔ£¬×÷ÕßÔÚÎÄÖиÅÊöÁ˵±½ñJavaµÄµØÎ»¼°Æä·¢Õ¹Ç÷ÊÆ£¬ÓÐÁ¦µØ»Ø»÷ÁËÕâЩ´«ÑÔ¡£È«Î ......

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      ×î½ü°àÀïµÄͬѧ¶¼Ã¦×ű¨°à£¬Óиö´ïÄÚÊÇjavaÅàѵ£¬ÓиöÉîÀ¶ÊÇC++Åàѵ£¬ÍøÉÏ¿´ÁËЩÌû×Ó˵ʲôµÄ¶¼ÓУ¬×ÔÎҸоõÅàÑøÒ»¸öC++³ÌÐòÔ±µÄÖÜÆÚÒª±ÈÅàÑøÒ»¸öjAVA³ÌÐòÔ±µÄÖÜÆÚ³¤ºÜ¶à£¬µ±È»£¬C++ÒªÊÇѧµÄºÃµÄ»°¿Ï¶¨±ÈѧjavaµÄÅ££¬µ«ÊǸ¶³öµÄ´ú¼Û¸öÈËÈÏΪÊÇÓкܴó²î¾àµÄ¡£¶ÔÓÚÏÖÔÚÊг¡É϶ÔÓÚÓïÑÔµÄÐèÇóÒ² ......

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package reflect;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Test {
 public static void main(String[] args) {
  try {
   Class c = Class.forName("reflect.Student");// ¸ù¾ÝÀàµÄÍêÕûÀàÃû´´½¨ÀàÏó
    ......
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