package download;public class Addtion {    // 定義輸出提示信息及線程sleep類  public Addtion(){  }  public static void sleep(int nSecond){    try{      Thread.sleep(nSecond);    }    catch(Exception e){      e.printStackTrace ();    }  }  public static void log(String sMsg){    System.out.println(sMsg);  }  public static void log(int sMsg){    System.out.println(sMsg);  }}