import?java.awt.BorderLayout;
import?java.awt.Color;
import?java.awt.Font;
import?java.awt.GridLayout;
import?java.awt.Robot;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?java.awt.event.KeyAdapter;
import?java.awt.event.KeyEvent;
import?java.awt.event.KeyListener;
import?java.awt.event.MouseAdapter;
import?java.awt.event.MouseEvent;
import?java.awt.event.MouseMotionAdapter;
import?javax.swing.JButton;
import?javax.swing.Jframe;
import?javax.swing.JLabel;
import?javax.swing.JMenu;
import?javax.swing.JMenuBar;
import?javax.swing.JMenuItem;
import?javax.swing.JPanel;
import?javax.swing.JTextField;

public?class?Calculator??implements?ActionListener?{
	
	private?Jframe?frame?=?new?Jframe（“計算器“）;		//定義窗口
	private?int?xx?yy;								//保