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public class TestS
{
        public static void test(String str)//ÕâÀïstring str ÊǶ¨ÒåÁËÒ»¸öеĶÔÏó£¿
        {
            str = "world";

        }
        public static void main(String[] args)
        {
            String  str = new String("hello");
            test(str);
           
System.out.println(str); //strµÄֵûÓиıä
}
}
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Äã×îºóÊä³öµÄÊǶ¨ÒåÔÚmain()Öж¨ÒåµÄstr
ÄãÒªÊä³öworld£¬¾ÍÒªÔÚtest()ÖÐдSystem.out.println(str);
test(str)Ö»ÊǰÑmain()ÖеÄstrÖµ¸³¸øÁËtest()ÖеÄstr
str = "world";¸Ä±äÁËtest()ÖеÄstrûÓиıämain()ÖеÄstr

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