single vs new
有一連線資料庫的類DBLogin.java,為了方便其他部分呼叫它。把它寫成single模式，還是一般類。
呼叫方法分別為：
1。DBLogin db=new DBLogin();
2.DBLogin.getinstance().
哪種速度上更快。
呼叫方法分別為：
1。DBLogin db=new DBLogin();
2.DBLogin.getinstance().
哪種速度上更快。
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