(1)　　使用布局设置组件的位置，包含一个提示标签和一个显示结果标签，三个按钮，为按钮编写单击事件处理方法。当用户用鼠标单击按钮时，会在界面上显示哪个按钮被按下。-(1) the location of the component layout settings, including a prompt label and a label display the results, three buttons, writing for the button click event handler method. When the user clicks on a button with the mouse, which will be displayed on the interface button is pressed.