/**
   A simple-minded stopwatch class for elapsed timing.
 */

public class 
Stopwatch {


  /**
     Create a stopwatch.
   */

  public
  Stopwatch() {
    startTime = 0
    }


  /**
     Start timing.
   */

  public void 
  start() { 
    startTime = System.currentTimeMillis()
    }


  /**
     Stop timing.

     @return The time elapsed between start and stop in milliseconds.
   */

  public int
  stop() { 
    return (int) (System.currentTimeMillis() - startTime)
    }


  /**
     When the start() method was called.
   */

  private long startTime
  }