用Swing插件完成一个登陆小程序，　　要求绘制图形界面，输入用户名和密码，并进行判断，如果判断正确弹出提示对话框，确定后输入内容清空，若判断不正确，弹出提示错误的对话框并清空输入内容。-Swing plug-in to complete a landing with a small procedure that requires the drawing graphical interface, enter the user name and password, and to judge, if prompted to determine the correct dialog box, enter the content to determine empty, if the judge is not correct, an error dialog box pops up and Clear input.