stopwatch.java

用JAVA写的计时程序

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;
//------------------------------------------------------------------------------
  /**
   * 启动秒表
  */
  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;
  }
//------------------------------------------------------------------------------
  /**
  * 分割时间
  */
  public void split() {
  this.stopTime =System.currentTimeMillis();
  }
//------------------------------------------------------------------------------
  /**
  * 移除分割
  */
  public void unsplit() {
  this.stopTime = -1;
  }
//------------------------------------------------------------------------------
  /**
  * 获得秒表的时间，这个时间或者是启动时和最后一个分割时刻的时间差，
  * 或者是启动时和停止时的时间差，或者是启动时和这个方法被调用时的差
  */
  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类型的时间差
  * 形式为小时，分钟，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
//------------------------------------------------------------------------------