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

JavaÖØÐ´ÓëÖØÔØ

ÖØÐ´µÄÖ÷ÒªÓŵãÊÇÄܹ»¶¨Òåij¸ö×ÓÀàÌØÓеÄÌØÕ÷:
       Èç:
    public class Father
    {
             public void speak()
             {
               System.out.println("Father");
             }                  
    }
   public class Son extends Father
    {
             public void speak()
             {
               System.out.println("son");
             }                  
    }
ÕâÒ²½Ð×ö¶à̬ÐÔ,ÖØÐ´·½·¨Ö»ÄÜ´æÔÚÓÚ¾ßÓм̳йØÏµÖÐ,ÖØÐ´·½·¨Ö»ÄÜÖØÐ´¸¸Àà·Ç˽Óеķ½·¨,
  
    µ±ÉÏÀýÖÐ FatherÀà speak()·½·¨±»privateʱ,SonÀ಻ÄÜÖØÐ´ FatherÀà speak()·½·¨,´ËʱSonÀà speak()·½·¨Ï൱ÓëÔÚSonÀàÖж¨ÒåµÄÒ»¸öspeak()·½·¨.
FatherÀà speak()·½·¨Ò»µ«±»finalʱ,ÎÞÂ۸÷½·¨±»public,protected¼°Ä¬ÈÏËùÐÞÊÎʱ,SonÀà¸ù±¾²»ÄÜÖØÐ´ FatherÀà speak()·½·¨,ÊÔͼ±àÒë´úÂëʱ,±àÒëÆ÷»á±¨´í.Àý:
   public class Father
    {
          fianl   public void speak()
             {
               System.out.println("Father");
         &


Ïà¹ØÎĵµ£º

Developing Games in Java£¨²¿·Ö£©

   Ô­ÎÄÀ´×ÔÓÚ¡¶Developing Games in Java¡·£¬×÷ÕߣºDavid Brackeen, Bret Barker, Laurence Vanhelsuwé
   JavaÔÚÉè¼ÆÊ±³ä·Ö¿¼ÂÇÁËÏß³Ì,Òò´ËÔÚJavaÖÐÏ̵߳IJÙ×÷±ÈÆäËûÓïÑÔÒª¼òµ¥¡£Ö»ÐèÉú³ÉÒ»¸öThreadÀàµÄʵÀý±ã¿É´´½¨Ò»¸öỊ̈߳¬È»ºóµ÷ÓÃstart()·½·¨Ïß³Ì¾ÍÆô¶¯ÁË¡£
 &nbs ......

java ¶Áȡһ¸öexcel


try {
String source = "xxx.xls";
InputStream is = new FileInputStream(source);
Workbook rwb = Workbook.getWorkbook(is);
Sheet sheet = rwb.getSheet(0);
for (int i = 1; i < sheet.getRows(); i++) {
for (int j = 1; j < sheet.getColumns(); j++) {
//»ñȡָ¶¨µ¥Ôª¸ñ ......

javaÈÕÆÚ´¦ÀíSystem£¨1£©

È¡µÃµ±Ç°ÏµÍ³Ê±¼ä   System.currentTimeMillis()
·µ»ØºÁÃëʱ¼ä£¬ÎªlongÐÍÕûÊý£¬
¸Ãº¯ÊýÔÚ½øÐÐϵͳÐÔÄÜ¼à¿ØÊ±×î³£Óõ½
Àý£º
  long start = System.currentTimeMillis();
  //Òª¼à¿ØµÄ´úÂë¶Î
  long end = System.currentTimeMillis();
  System.out.println(end-start);
ÓÐʱҪ¼à¿Øµ ......

javaÖÐabstractÓëinterface

   abstract  classºÍinterfaceÊÇJavaÓïÑÔÖжÔÓÚ³éÏóÀඨÒå½øÐÐÖ§³ÖµÄÁ½ÖÖ»úÖÆ£¬ÕýÊÇÓÉÓÚÕâÁ½ÖÖ»úÖÆµÄ´æÔÚ£¬²Å¸³ÓèÁËJavaÇ¿´óµÄÃæÏò¶ÔÏóÄÜÁ¦¡£ abstract  classºÍinterfaceÖ®¼äÔÚ¶ÔÓÚ³éÏóÀඨÒåµÄÖ§³Ö·½Ãæ¾ßÓкܴóµÄÏàËÆÐÔ£¬ÉõÖÁ¿ÉÒÔÏà»¥Ìæ»»£¬Òò´ËºÜ¶à¿ª·¢ÕßÔÚ½øÐгéÏóÀඨÒåʱ¶ÔÓÚ abstract  cl ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ