String s="123"; 這個變量s是個引用變量么？如果是那是不是里面存了個地址？請看下面這段代碼：package?temptest;
public?class?Test5?{
?????public?void?exchange(String?a)?{
?????????a="112233";
????}
?????public?static?void?main(String[]?args)?{
????????String?s="123";
????????Test5?t=new?Test5();
????????t.exchange(s);
????????System.out.println(s);
????????}
}為什么s還是"123"啊？
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