一个能响应键盘事件的java程序。按下键盘一个字符，文本框中显示相应字符。一个是文本框自己的，一个是显示出来的-a keyboard can respond to the java process. Press a keyboard characters, text box shows the corresponding characters. Is a text frame of its own, is a show of

在按下键盘上按键的时候获取并显示对应按键的keyCode和keyChar的值(When you press the button on the keyboard, it will get and display the values of keyCode and keyChar for the corresponding key)