delayedtyper.java

著名的uncle Bob的Agile software development的代码

public class DelayedTyper implements Command
{
  private long itsDelay;
  private char itsChar;
  private static ActiveObjectEngine engine = new ActiveObjectEngine();
  private static boolean stop = false;

  public static void main(String args[]) throws Exception
  {
    engine.addCommand(new DelayedTyper(100,'1'));
    engine.addCommand(new DelayedTyper(300,'3'));
    engine.addCommand(new DelayedTyper(500,'5'));
    engine.addCommand(new DelayedTyper(700,'7'));

    Command stopCommand = new Command()
    {
      public void execute() {stop=true;}
    };

    engine.addCommand(new SleepCommand(20000,engine,stopCommand));
    engine.run();
  }

  public DelayedTyper(long delay, char c)
  {
    itsDelay = delay;
    itsChar = c;
  }

  public void execute() throws Exception
  {
    System.out.print(itsChar);
    if (!stop)
      delayAndRepeat();
  }

  private void delayAndRepeat() throws CloneNotSupportedException
  {
    engine.addCommand(new SleepCommand(itsDelay,engine,this));
  }

}