Timer/ActionListener用法

Question

我想这很简单，但我真的不能说出错误是什么。

    final Timer tiempo= new Timer(1000,new ActionListener()) ;

我唯一想要的是，1000的延迟和一个动作监听器，我不完全理解。问题是我总是得到一个错误。“还没有定义。”

使用该方法

        final Timer tiempo= new Timer(1000, ActionListener() 
    { 
        public void actionPerformed(ActionEvent e) 
        {   

        }
    };    

仍然没有定义，之前也尝试过创建一个实例

ActionListener actionlistener= new ActionListener();
            final Timer tiempo= new Timer(1000, actionlistener() 
    { 
        public void actionPerformed(ActionEvent e) 
        {   

        }
    };    

请解释一下，这是非常令人沮丧的。

Error: ActionListner cannot be resolved to a variable

Answer 1

final Timer tiempo= new Timer(1000, ActionListener() 
{ 
    public void actionPerformed(ActionEvent e) 
    {   

    }
};  

应该是new ActionListener()

final Timer tiempo= new Timer(1000, new ActionListener() 
{ 
    public void actionPerformed(ActionEvent e) 
    {   

    }
};  

你的第二个例子是错误的，原因有很多……

ActionListener actionlistener= new ActionListener(); // This won't compile
// because it is an interface and it requires either a concrete implementation
// or it's method signatures filled out...

// This won't work, because java sees actionlistener() as method, which does not
// exist and the rest of the code does not make sense after it (to the compiler)
final Timer tiempo= new Timer(1000, actionlistener() 
{ 
    public void actionPerformed(ActionEvent e) 
    {   

    }
}; 

它应该看起来更像..。

ActionListener actionlistener= new ActionListener()
{ 
    public void actionPerformed(ActionEvent e) 
    {   

    }
}; 
final Timer tiempo= new Timer(1000, actionlistener);