创建带有标签和文本域的窗体。当用户在文本域中输入其姓名后，显示欢迎用户使用 java 编程的消息。例如用户输入姓名 flyhorse ，则显示消息“你好， flyhorse, 欢迎你使用 java 编程！”，并能正常关闭窗口。-Create labels and text fields with the form. Domain in the text when a user enter their name, the show welcomes users java programming news. For example, the user enters the name of flyhorse, then displays the message　Hi, flyhorse, welcome you to use java programming!　And normally close the window.