addKeyListener 未按预期工作
我使用按键事件而不是按键绑定，因为我还不了解按键绑定。
我用带有 Jbutton 的 JPanel 制作了 JFrame 。
我将 JPanel 实例化为框架类中的面板，将 JButton 实例化为面板类中的按钮。我继续编辑面板的类。
如果我 addKeyListener 带有一个新的 keyAdapter ，它只打印“按键按下”，那么如果我输入任何内容，什么也不会发生。但是，如果我使用相同的通用 keyAdapter 执行 button.addKeyListener ，则当我按下某个键时，将打印“key Pressed”。
我认为这与实例有关。所以我的第一个问题是：如何让组件向自身添加关键侦听器和/或为什么不调用 addKeyListener 甚至 this.addKeyListener 执行此操作？
当我添加一个关键侦听器时，代码会继续运行（可能应该如此），因此我尝试执行 while(some boolean) thread.sleep(1000) 只是让关键侦听器在按键时更改布尔值按下。我只是想让我的代码等待，直到按下一个键。我知道这没什么可继续的，但我的问题是：是否有更好或更干净的方法来暂停方法/等待输入？
I'm using Key Events over Key Binding because I don't understand key binding yet.
I make a JFrame with a JPanel with a Jbutton.
I instance the JPanel as panel in the frame's class and the JButton as button in the panel's class. I continue editing the panel's class.
If I addKeyListener with a new keyAdapter that just prints "key pressed", nothing happens if I type anything. BUT if I do button.addKeyListener with the same generic keyAdapter, "key pressed" will print when I push a key.
I assume this has something to do with instances. So my first question is: How can I have a component add a key listener to itself and/or why doesn't calling the addKeyListener or even this.addKeyListener do this?
When I add a key listener the code keeps going (as it probably should) so I tried doing while(some boolean) thread.sleep(1000) just having the key listener change the boolean when a key is pressed. I simply want my code to wait until a key is pressed. I understand this isn't much to go on but my question is: is there a better or cleaner way to pause methods/wait for input?
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可能是因为组件没有焦点。 KeyEvent 只分派给具有焦点的组件。对于按键绑定来说这不是问题，因为即使组件没有焦点，它们也可以处理事件。
Probably because the comonent doesn't have focus. KeyEvents are only dispatched to the component with focus. This is not a problem with Key Bindings because they can handle events even when the component doesn't have focus.