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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);
    }
 
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first : hello 
second: hello world 
third : 
main  : hello world 
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      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¡£
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      str = str.append(" world");
      ÓÉÓÚstrͬÑùÒ²ÊÇÖ¸Ïò"hello"¶ÔÏó£¬ËùÒԸòÙ×÷»á¸Ä±ä¶ÔÏó±¾Éí"hello"±ä³É"hello world";
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      str = tempStr;
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