设计一个窗口，在该窗口中练习键盘的响应，要求如下：单击键盘上的向上箭头时，窗口中显示“You had hitted the up key”；单击键时，窗口中显示“You had hitted the SHIFT key”；单击键时，窗口中显示“You had hitted the CTRL key”；单击键时，窗口中显示“You had hitted the CTRL A key”；单击键时，窗口中显示“You had hitted the SHIFT B key”。
设计一个窗口，在该窗口中练习键盘的响应，要求如下：单击键盘上的向上箭头时，窗口中显示“You had hitted the up key”；单击键时，窗口中显示“You had hitted the SHIFT key”；单击键时，窗口中显示“You had hitted the CTRL key”；单击键时，窗口中显示“You had hitted the CTRL A key”；单击键时，窗口中显示“You had hitted the SHIFT B key”。
