°ïæ½âÊÍÒ»ÏÂjavaÖµ´«µÝÓëÒýÓô«µÝ

    Java code:
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);
}



½á¹ûΪ:
first : hello
second: hello world
third :
main  : hello world

ºóÁ½¸öµÄ´òÓ¡½á¹ûÊÇʲôԭÒò

---

ÊÔÁËÏ  ¹ûÈ»ÊÇÕâÑù    À§»ó....°ï¶¥...

---

Java code:
public static void test(StringBuffer str)
{
StringBuffer tempStr = new StringBuffer(); //¹¹ÔìÒ»¸ötempStrµÄStringBuffer¶ÔÏó

System.out.println("first : " + str);//Êä³östr£¬Ã»ÓÐÎÊÌ⣬¿Ï¶¨ÊÇhello
str = str.append(" world");//ÔÚhelloºóÃæÁ¬½Ó" world"£¬²¢ÖØи³Öµ¸østr£¬ËùÒÔstrÏÖÔÚÊÇ"hello world"
System.out.println("second: " + str); //Êä³ö"