1.以下程序中有没有错误？如果有，请说明错误发生的前提以及现象：）

public class FlyBird

{

private static FlyBird bird;

public static FlyBird getBird()

{

if(bird==null)

bird=new FlyBird();

return bird;

}

public event FlyEventHandler OnFly;

public void OnFlyEvent(string m)

{

this.OnFly(this,new FlyEventArgs(m));

}

public void StartFly()

{

this.OnFlyEvent("正在起飞...");

....

}

public void PauseFly()

{

this.OnFlyEvent("暂停飞行...");

...

}

public void Cookie()

{

this.OnFlyEvent("回家做饭：）。。。"):

....

}

public void InLove()

{

this.OnFlyEvent("恋爱中...");

}

public FlyBird()

{

}

public delegate void FlyEventHandler(object,FlyEventArgs);

}

public class FlyEventArgs:EventArgs

{

private string status;

public string Status

{

get

{

return status;

}

}

public FlyEventArgs(string m):base()

{

this.status=m;

}<