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

Effective Java ѧϰ±Ê¼Ç (11)

CloneÕâ¸ö·½·¨ºÜ¼¦Àߣ¬Ô­ÒòÊÇÒòΪËüÊÇÊܱ£»¤µÄ(protected)£¬Æä¶þCloneÕâ¸ö·½·¨ÊÇ¿ÉÑ¡µÄ£¬¼´ÓпÉÄÜÀàûÓÐÌṩÕâ¸ö·½·¨¡£
cloneûÓе÷Óù¹Ô캯Êý£¬¶øÇÒÈç¹û¸¸ÀàûÓÐʵÏÖcloneµÄ»°£¬×ÓÀàÓÀÔ¶Ò²²»¿ÉÄÜÕýȷʵÏÖclone.
×ÜÖ®£¬cloneÊǸöºÜÍ·Í´µÄº¯Êý£¬Èç¹ûÒªÕýȷʵÏÖ£¬±ØÐ뿼Âǵ½É±´µÄÇé¿ö£¬·ñÔò±»¿Ë¡³öÀ´µÄ¶ÔÏó¾Í²»ÊǶÀÁ¢µÄ£¬È磬Ҫдһ¸ö¶ÑÕ»ÀàµÄ¿Ë¡º¯Êý£¬ÕýÈ·µÄʵÏÖ·½·¨ÊÇ£º
@Override public Stack clone() {
            try {
                        Stack result = (Stack) super.clone();
                        result.elements = elements.clone();
                        return result;
            } catch (CloneNotSupportedException e) {
                        throw new AssertionError();
            }
}
ҪעÒâ¶ÔÓÚfinal×ֶβ»ÄÜÕý³£¹¤×÷£¬clone½á¹¹Óë¿É±ä¶ÔÏóµÄfinal×Ö¶ÎÊDz»¼æÈݵġ£
¶ÔÓÚÁÐÉ¢Êý×飬½ö½öµÝ¹éµ÷ÓõÄclone·½·¨»¹²»¹»£¬¿´ÊéÖÐÕýÈ·µÄ×ö·¨£º
public class HashTable implements Cloneable {
            private Entry[] buckets = ...;
            private static class Entry {
                        final Object key;
                     


Ïà¹ØÎĵµ£º

javaÓï¾ä

java´óÖÂÓÐ3ÖÖÓï¾ä£ºË³ÐòÓï¾ä¡¢Ìõ¼þÓï¾ä¡¢Ñ­»·Óï¾ä
Ìõ¼þÓï¾ä£º
      µÚÒ»ÖÖ£ºif Ìõ¼þ
                      Óï¾ä
      µÚ¶þÖÖ£ºif Ìõ¼þ
 &nbs ......

Oracle + Sun: Java Strategy

Oracle and Sun
http://www.oracle.com/events/productstrategy/index.html
Oracle + Sun: Java Strategy
   http://oracle.com.edgesuite.net/ivt/4000/8104/9236/12630/lobby_external_flash_clean_480x360/default.htm 
Oracle + Sun: Java Strategy
  ......

Java»·¾³±äÁ¿ÉèÖÃ

Ò»¡¢ÈçºÎ°²×°JDK£¿   
    µ±ÎÒÃÇ´ÓÍøÂçÉÏDOWNÏÂJ2SE 5.0 JDKÒÔºó£¨ÊÇÒ»¸ö¿ÉÖ´ÐÐÎļþ£¬ÎļþÃû½Ð×öjdk-1_5_0-windows-i586.exe£¬µ±È»Õâ¸öÃû×Ö»áÒòΪ¶ÔÓ¦²Ù×÷ϵͳµÄ²»Í¬¶øÓÐËùÇø±ðµÄ£¬ÎÒʹÓõIJÙ×÷ϵͳ¾ÍÊÇWINDOWS£¬´ó¼Ò·¢ÏÖÁËÂ𣿣©£¬Ë«»÷Ëû¾Í¿ªÊ¼°²×°ÁË¡£ÐèҪעÒâµÄ¾ÍÊÇÑ¡Ôñ°²×°Â·¾¶µÄÎÊÌâ ......

JavaÖеÄinstanceof¹Ø¼ü×Ö

instanceofÊÇJavaµÄÒ»¸ö¶þÔª²Ù×÷·û£¬ºÍ==£¬>£¬<ÊÇͬһÀà¶«¶«¡£ÓÉÓÚËüÊÇÓÉ×Öĸ×é³ÉµÄ£¬ËùÒÔÒ²ÊÇJavaµÄ±£Áô¹Ø¼ü×Ö¡£ËüµÄ×÷ÓÃÊDzâÊÔËü×ó±ßµÄ¶ÔÏóÊÇ·ñÊÇËüÓұߵÄÀàµÄʵÀý£¬·µ»ØbooleanÀàÐ͵ÄÊý¾Ý¡£¾Ù¸öÀý×Ó£º
¡¡¡¡String s = "I AM an Object!";
¡¡¡¡boolean isObject = s instanceof Object;
¡¡¡¡ÎÒÃÇÉùÃ÷ÁËÒ»¸öStrin ......

java file io

ʹÓÃJava²Ù×÷Îı¾ÎļþµÄ·½·¨Ïê½â
ÕªÒª: ×î³õjavaÊDz»Ö§³Ö¶ÔÎı¾ÎļþµÄ´¦ÀíµÄ£¬ÎªÁËÃÖ²¹Õâ¸öȱº¶¶øÒýÈëÁËReaderºÍWriterÁ½¸öÀà
×î³õjavaÊDz»Ö§³Ö¶ÔÎı¾ÎļþµÄ´¦ÀíµÄ£¬ÎªÁËÃÖ²¹Õâ¸öȱº¶¶øÒýÈëÁËReaderºÍWriterÁ½¸öÀ࣬ÕâÁ½¸öÀà¶¼ÊdzéÏóÀ࣬WriterÖÐ write(char[] ch,int off,int
length)£¬flush()ºÍclose()·½·¨Îª³éÏó·½· ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ