一个简单的程序，4个人20天的心血.packagezhuyemian;importjava.awt.BorderLayout;importjava.awt.Cursor;importjava.awt.Dimension;importjava.awt.Font;importjava.awt.Graphics;importjava.awt.Toolkit;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.io.IOException;importjava.text.SimpleDateFormat;import