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

JAVA²ÎÊý´«µÝÖµ´«µÝµÄÀí½â¡£

Ê×ÏÈÃ÷ȷһϣºjavaÀïÃæÖ»ÓÐÖµ´«µÝ£¬ÒýÓô«µÝÖ»ÊÇÒ»Ö»Îó¶Á¶øÒÑ¡£
À´¿´Ò»¸öÀý×Ó£º
public static void main(String[] args)
{
StringBuffer str1 = new StringBuffer("hello");
test(str1);
System.out.println("main : " + str1);
}
public static void test(StringBuffer str)
{
StringBuffer tempStr = new StringBuffer();
System.out.println("first : " + str);
str = str.append(" world");
System.out.println("second: " + str);
str = tempStr;
System.out.println("third : " + str);
}

½á¹û
first : hello
second: hello world
third :
main  : hello world
      Ç°ÃæÈý¸ö´òÓ¡½á¹û¶¼ºÜºÃÀí½â£¬×îºóÒ»¸ömainÀïÃæ´òÓ¡³öµÄΪʲôÊÇ hello worldÄØ£¿
      ÈÃÎÒÃÇÒ»²½Ò»²½À´·ÖÎö£º
      test(str1);
      µ÷ÓÃtest()·½·¨¡£StringBuffer ¶ÔÏó("hello")µÄÒýÓÃ×öΪ²ÎÊý´«¸øtest()·½·¨¡£ÓÐÈ˾ÍÒªÎÊÁË£ºÄãÕâÀï²»¾ÍÊÇ´«µÄÒýÓÃô£¿ÎªÊ²Ã´»¹ËµjavaÀïÃæ¶¼ÊÇÖµ´«µÝÄØ£¿¹Ø¼ü¾ÍÔÚÕâÀÆäʵÕâÀïµÄÖµ´«µÝµÄ'Öµ'µÄÒâ˼ÊÇ----ÒýÓõÄÖµ£¬ÎÒÃÇÖªµÀÒýÓÃÆäʵҲÊÇÒ»¸ö¶ÔÏó£¬ÕâÀï´«µÝµÄ¾ÍÊÇÒýÓõı¾Éí¡£¶ø¶Ô´«µÝµÄÀí½â£¬²¢²»ÊǾÍÊǰÑÕâ¸öÒýÓÃÄùýÈ¥£¬¶øÊǽ«Æä¸´ÖÆÒ»·Ý£¬½«¸±±¾´«¸øtest()·½·¨¡£ËùÒÔÎÒÃǽøµ½test·½·¨ÀïÃæµÄʱºò£¬strÊÇÒ»¸öÐµĶ«¶«£¬ËüÓëmainº¯ÊýÀïÃæµÄstr1ͬÑùÖ¸Ïò£¨ºÜ¶àÈ˲»Àí½âÕâ¸öÖ¸Ïòµ½µ×ΪºÎÒ⣬ÎÒÃÇ˵һ¸öÒýÓÃÆäʵҲÊÇÒ»¸ö¶ÔÏó£¬ÄÇôÕâ¸ö¶ÔÏóÀïÃæ°üº¬µÄÄÚÈÝ£¬»òÊÇ˵ËüµÄ²ÎÊý¾ÍÊÇËüËùÖ¸ÏòµÄ¶ÔÏóµÄµØÖ·£©"hello"Õâ¸öStringBuffer¶ÔÏó£¬ÕâÊÇÒ»¸ö¹Ø¼üµã¡£
      ÔÙÍùÏ¿´ÎÊÌâ¾ÍÓ­Èжø½âÁË£¬
      str = str.append(" world");
      ÓÉÓÚstrͬÑùÒ²ÊÇÖ¸Ïò"hello"¶ÔÏó£¬ËùÒԸòÙ×÷»á¸Ä±ä¶ÔÏó±¾Éí"hello"±ä³É"hello world";
      ÔÚÍùÏÂ
      str = tempStr;
      ÕâÀïҲҪעÒ⣬Õâ¸ö²Ù×÷ºÍ֮ǰµÄÓÐËù²»Í¬£¬Õâ¸öÊÇÒýÓõĸ³ÖµÔËË㣬Ҳ¾ÍÊÇ˵¸Ä±äµÄ¾Í²»ÊÇÒýÓÃÖ¸ÏòµÄ¶ÔÏóÁ˶øÊÇÒýÓñ¾Éí£¬½«tempStrÒýÓõÄÄÚÈݸ³¸østrÒýÓã¬Ò


Ïà¹ØÎĵµ£º

½« Flex ¼¯³Éµ½ Java EE Ó¦ÓóÌÐòµÄ×î¼Ñʵ¼ù


Ô­ÌûµØÖ·£ºhttp://www.ibm.com/developerworks/cn/java/j-lo-jeeflex/?S_TACT=105AGX52&S_CMP=tec-csdn
´«Í³µÄ Java EE Ó¦ÓóÌÐòͨ³£Ê¹ÓÃijÖÖ MVC ¿ò¼Ü£¨ÀýÈ磬Struts£©×÷Ϊǰ¶ËÓû§½çÃæ£¬Ëæ×Å Flex µÄÐËÆð£¬»ùÓÚ RIA µÄ¿Í»§¶ËÄܹ»¸øÓû§´øÀ´¸ü¿áµÄ½çÃæ£¬¸ü¶ÌµÄÏìӦʱ¼ä£¬ÒÔ¼°¸ü½Ó½üÓÚ×ÀÃæÓ¦ÓóÌÐòµÄÌåÑé¡£±¾ÎĽ«½²Ê ......

Java ¶ÁдExcelÎļþ £¨¶þ£©

JAVA EXCEL API¼ò½é
Java ExcelÊÇÒ»¿ª·ÅÔ´ÂëÏîÄ¿£¬Í¨¹ýËüJava¿ª·¢ÈËÔ±¿ÉÒÔ¶ÁÈ¡ExcelÎļþµÄÄÚÈÝ¡¢´´½¨ÐµÄExcelÎļþ¡¢¸üÐÂÒѾ­´æÔÚµÄExcelÎļþ¡£Ê¹ÓøÃAPI·ÇWindows²Ù×÷ϵͳҲ¿ÉÒÔͨ¹ý´¿JavaÓ¦ÓÃÀ´´¦ÀíExcelÊý¾Ý±í¡£ÒòΪÊÇʹÓÃJava±àдµÄ£¬ËùÒÔÎÒÃÇÔÚWebÓ¦ÓÃÖпÉÒÔͨ¹ýJSP¡¢ServletÀ´µ÷ÓÃAPIʵÏÖ¶ÔExcelÊý¾Ý±íµÄ·ÃÎÊ¡£
ÏÖÔ ......

JAVAµÄ²ÎÊý´«µÝ»úÖÆ

²ÎÊý´«µÝ»úÖÆÖ÷ÒªÓÐÁ½ÖÖ£ºÖµµ÷ÓÃ(call-by-value)£¬ÒýÓõ÷ÓÃ(call-by-reference)¡£
Öµµ÷ÓÃ(call-by-value)£º»á¶ÔʵÔÚ²ÎÊýÇóÖµ£¨Èç¹ûÊDZí´ïʽ£©»ò¿½±´£¨Èç¹ûÊDZäÁ¿£©¡£ÕâЩֵ±»·ÅÔÚÊôÓÚ±»µ÷Óùý³ÌµÄÏìÓ¦ÐÎʽ²ÎÊýµÄÄÚ´æÎ»ÖÃÉÏ¡£
ÒýÓõ÷ÓÃ(call-by-reference)£ºÊµÔÚ²ÎÊýµÄµØÖ·×÷ΪÏàÓ¦µÄÐÎʽ²ÎÊýµÄÖµ±»´«µÝ¸ø±»µ÷ÓÃÕß¡£ÔÚ±»µ÷ ......

javaÒì³£´¦Àí¼¼ÇÉ´óÈ«

¡¡¡¡Java±à³ÌÖеÄÒì³£´¦ÀíÊÇÒ»¸öºÜ³£¼ûµÄ»°ÌâÁË£¬¼¸ºõÈκÎһÎéÉÜÐÔµÄJava¿Î³Ì¶¼»áÌáµ½Òì³£´¦Àí¡£²»¹ý£¬ÎÒÈÏΪºÜ¶àÈËÆäʵ²¢Ã»ÓÐÕæÕýÕÆÎÕÕýÈ·´¦ÀíÒì³£Çé¿öµÄ·½·¨ºÍ²ßÂÔ£¬×î¶àÒ²¾Í²»¹ýÁ˽â¸ö´ó¸Å£¬ÖªµÀµã¸ÅÄî¡£±¾ÎľͶÔÈýÖÖ²»Í¬³Ì¶ÈºÍÖÊÁ¿µÄJavaÒì³£´¦Àí½øÐÐÁËÌÖÂÛ£¬Ëù²ûÊöµÄ´¦ÀíÒì³£µÄ·½Ê½°´ÊÖ·¨µÄ¸ßÏ·ÖΪ£ººÃ£¬²»ºÃºÍ¶ñÁÓ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ