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JAVAÖµ´«µÝ(call by value)

public class Foo {
 static void operate(StringBuffer x,StringBuffer y){
  x.append(y);
  y=x;
 }
 public static void main(String args[]){
  StringBuffer a = new StringBuffer("A");
  StringBuffer b = new StringBuffer("B");
  
  operate(a,b);
  System.out.println(a+","+b);
 }
}
Êä³öAB ,  B
JAVA·½·¨µ÷ÓÃÊÇͨ¹ý“´«Öµ”£¬¶ÔÓÚÔ­ÐÍÀ´Ëµ£¬ÊǰÑÖµcopy¹ýÈ¥£¬Óëµ÷ÓÃÕ߾Ͳ»Ïà¸ÉÁË¡£µ«ÊǶÔÓÚÒýÓÃÀ´Ëµ£¬Ö»ÊÇÒâζ×ŰÑÄÚ´æµØÖ·´«¹ýÈ¥£¬ÀïÃæ´æ·ÅµÄ“ÄÚÈÝ”¸úµ÷ÓÃÕßÊÇͬһ¸ö£¡Ò²¼´ËµÐÞ¸ÄÄÚÈÝ»áÓ°Ïìµ÷ÓÃÕß
x.append(y);//»áʹa±ä³ÉAB,
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y   =   x   ;//Ö»ÊÇʹ“Õâ¸ö”·½·¨ÄÚµÄÁÙʱ±äÁ¿yÖ¸Ïòx,¶ø²»»áÓ°Ïì´Ë·½·¨ÍâµÄµ÷ÓÃÕßµÄÒýÓã¬
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ÉèÖÃ×¢ÊÍÄ£°åµÄÈë¿Ú£º Window->Preference->Java->Code Style->Code Template È»ºóÕ¹¿ªComments½Úµã¾ÍÊÇËùÓÐÐèÉèÖÃ×¢Ê͵ÄÔªËØÀ²¡£ÏÖ¾Íÿһ¸öÔªËØÖðÒ»½éÉÜ£º
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/**   
* @Title: ${file_name}
* @Package ${package_name}
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Apache MINA (mina-2.0.0-M6Ô´ÂëΪÀý):
    ÎÒÃÇʹÓÃmina nio tcp×î³£ÓõÄÑùÀýÈçÏÂ:
        NioSocketAcceptor acceptor = new NioSocketAcceptor(/*NioProcessorPool's size*/);
        DefaultIoFilterChainBuilder cha ......

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public static boolean isNumeric(String str) {
for (int i = str.length(); i = 0;) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
public static boolean isNumeric(String str) {
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