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,
µ«ÊÇ
y = x ;//Ö»ÊÇʹ“Õâ¸ö”·½·¨ÄÚµÄÁÙʱ±äÁ¿yÖ¸Ïòx,¶ø²»»áÓ°Ïì´Ë·½·¨ÍâµÄµ÷ÓÃÕßµÄÒýÓã¬
ËùÒÔb»¹ÊǺ¬B
Ïà¹ØÎĵµ£º
(1)Õ»
package ChapterOne;
public class Stack {
//Õ»Êý×é
long stackArr[];
//Õ»µÄ´óС
int maxSize;
//Õ»µÄ¶¥²¿
int top;
//³õʼ»¯Ò»¸ö´óСΪsizeµÄÕ»
public Stack(int size){
maxSize = size;
stackArr = new long[size];
top = -1;
}
//³öÕ»²Ù×÷
public long pop(){
return sta ......
1, ±£Ö¤Ḭ̈߳²È«µÄÈýÖÖ·½·¨ :
a, ²»Òª¿çÏ̷߳ÃÎʹ²Ïí±äÁ¿
b, ʹ¹²Ïí±äÁ¿ÊÇ finalÀàÐ͵Ä
c, ½«¹²Ïí±äÁ¿µÄ²Ù×÷¼ÓÉÏͬ²½
2, Ò»¿ªÊ¼¾Í½«ÀàÉè¼Æ³ÉḬ̈߳²È«µÄ , ±ÈÔÚºóÆÚÖØÐÂÐÞ¸´Ëü ,¸üÈÝÒ× .
3, ±àд¶àÏ̳߳ÌÐò , Ê×Ïȱ£Ö¤ËüÊÇÕýÈ·µÄ , Æä´ÎÔÙ¿¼ÂÇÐÔÄÜ .
4, ÎÞ״̬»òÖ»¶Á¶ÔÏóÓÀÔ¶ÊÇḬ̈߳²È«µÄ .
5, ²»Òª½«Ò»¸ö¹²Ïí±äÁ¿Âã ......
1, ΪʲôwaitÓënotify֮ǰ±ØÐëÒª¼Ósynchronized?
´ð°¸ÆäʵºÜ¼òµ¥£¬Ò²ÊÇΪÁË·ÀÖ¹µÈ´ý-֪ͨ»úÖÆ³öÏÖrace condition
Ϊʲô»á³öÏÖrace condition ?
´ð£º ¶ÔÏóÔÚ±»wait֮ǰÒѾ±»ÁíÒ»Ïß³Ìnotify , Ö®ºóµÄwait »áÓÀ¾ÃÍ£Ö¹,²¢µ¼ÖÂdeadlock(ËÀËø)
ÀíÏëÇé¿ö£º
1, µÚÒ»¸öÏß³ÌÅжϸöÔÏóÊÇ·ñÒªwait
2, µÚÒ»¸öÏ߳̽«¶ÔÏówait
3 ......
ÉèÖÃ×¢ÊÍÄ£°åµÄÈë¿Ú£º Window->Preference->Java->Code Style->Code Template È»ºóÕ¹¿ªComments½Úµã¾ÍÊÇËùÓÐÐèÉèÖÃ×¢Ê͵ÄÔªËØÀ²¡£ÏÖ¾Íÿһ¸öÔªËØÖðÒ»½éÉÜ£º
Îļþ(Files)×¢ÊͱêÇ©£º
/**
* @Title: ${file_name}
* @Package ${package_name}
* @Description: ${todo}(ÓÃÒ»¾ä»°ÃèÊö¸ÃÎļ ......
1.Listת»»³ÉΪÊý×é¡££¨ÕâÀïµÄListÊÇʵÌåÊÇArrayList)
¡¡¡¡µ÷ÓÃArrayListµÄtoArray·½·¨¡£
¡¡¡¡toArray
¡¡¡¡public <T> T[] toArray(T[] a)·µ»ØÒ»¸ö°´ÕÕÕýÈ·µÄ˳Ðò°üº¬´ËÁбíÖÐËùÓÐÔªËØµÄÊý×飻·µ»ØÊý×éµÄÔËÐÐʱÀàÐ;ÍÊÇÖ¸¶¨Êý×éµÄÔËÐÐʱÀàÐÍ¡£Èç¹ûÁбíÄÜ·ÅÈëÖ¸¶¨µÄÊý×飬Ôò·µ»Ø·ÅÈë´ËÁбíÔªËØµÄÊý×é¡£·ñÔò£¬½«¸ù¾ ......