package?play;

import?javax.swing.*;

import?java.awt.*;
import?java.awt.event.*;
import?java.awt.Container;
import?java.awt.FlowLayout;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;

import?javax.swing.JButton;
import?javax.swing.Jframe;
import?javax.swing.JLabel;
import?javax.swing.JOptionPane;
import?javax.swing.JTextField;
import?javax.swing.WindowConstants;
public?class?playfair{
?private?static?final?int?WINDOW_WIDTH=450;//像素
?private?static?final?int?WINDOW_HEIGHT=270;//像素
?private?static?final?int?FIELD_WIDTH=20;//字節
?private?static?final?int?AREA_WIDTH=40;//字節
?private?static?final?String?doubleSignal=new?String（“Q“）;
?private?static?final?String?oddSignal=new?String（“oD“）;
?
?private?static?final?String?LEGEND=“playfair加密和解密“;