package stopwatch;//------------------------------------------------------------------------------public class StopWatch {  static public int AN_HOUR = 60 * 60 * 1000;  static public int A_MINUTE = 60 * 1000;  ;private long startTime = -1;  private long stopTime = -1;//------------------------------------------------------------------------------  /**   * 啟動秒表  */  public void start() {   this.startTime =System.currentTimeMillis();  }//------------------------------------------------------------------------------  /**  * 停止秒表  */  public void stop() {  this.stopTime =System.currentTimeMillis();  }//------------------------------------------------------------------------------  /**  * 重置秒表  */  public void reset() {  this.startTime = -1;  this.stopTime = -1;  }//------------------------------------------------------------------------------  /**  * 分割時間  */  public void split() {  this.stopTime =System.currentTimeMillis();  }//------------------------------------------------------------------------------  /**  * 移除分割  */  public void unsplit() {  this.stopTime = -1;  }//------------------------------------------------------------------------------  /**  * 獲得秒表的時間，這個時間或者是啟動時和最后一個分割時刻的時間差，  * 或者是啟動時和停止時的時間差，或者是啟動時和這個方法被調用時的差  */  public long getTime() {  if(stopTime != -1) {return(System.currentTimeMillis() - this.startTime);}  else {return this.stopTime - this.startTime;}  }//------------------------------------------------------------------------------  public String toString() {  return getTimeString();  }//------------------------------------------------------------------------------   /**  * 取得String類型的時間差  * 形式為小時，分鐘，秒和毫秒  ;*/  public String getTimeString() {  int hours, minutes, seconds,milliseconds;  long time = getTime();  hours = (int) (time / AN_HOUR);  time = time - (hours *AN_HOUR);  minutes = (int) (time /  A_MINUTE);  time = time - (minutes *A_MINUTE);  seconds = (int) (time / 1000);  time = time - (seconds * 1000);  milliseconds = (int) time;  return hours + "h:" +minutes + "m:" + seconds + "s:" + milliseconds;  }//------------------------------------------------------------------------------}//end of class//------------------------------------------------------------------------------