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

import?javax.swing.ButtonGroup;
import?javax.swing.Jframe;
import?javax.swing.JLabel;
import?javax.swing.JOptionPane;
import?javax.swing.JRadioButton;
import?javax.swing.JTextField;

public?class?Jisuanqi?extends?Jframe?implements?ActionListener?{
	/**
	?*?
	?*/
	private?static?final?long?serialVersionUID?=?4647217276157164555L;
	Jframe?f;

	double?a?b?result;
	JTextField?numJtf1;
	JTextField?numJtf2;
	JTextField?numJtf3;
	ButtonGroup?g;
	JRadioButton?plus;
	JRadioButton?minus;
	JRadioButton?multiplication;
	JRadioButton?division;
	JLabel?label1;
	JLabel?label2;
	JLabel?label3;

	public?Jisuanqi（）?{
		setLayout（new?FlowLayout（））;
		label1?=?new?JLabel（“數1“）;
		label2?=?new?JLabel（“數2“）;
		label3?=?new?JLabel（“結果“）;
		settitle（“簡易計算器“）;
		plus?=?new?JRadioButton（“+“）;
		minus?=?new?JRadioButton（“-“）;
		multiplication?=?new?JRadioButton（“*“）;
		division?=?new?JRadioButton（“/“）;
		g?=?new?ButtonGroup（）;
		g.add（plus）;
		g.add（minus）;
		g.add（multiplication）;
		g.add（division）;
		
		numJtf1?=?new?JTextField（5）;
		numJtf2?=?new?JTextField（5）;
		numJtf3?=?new?JTextField（20）;

		
		add（label1）;
		add（numJtf1）;

		add（plus）;
		add（minus）;
		add（multiplication）;
		add（division）;

		add（label2）;
		add（numJtf2）;

		add（label3）;
		add（numJtf3）;
		plus.addActionListener（this）;
		minus.addActionListener（this）;
		multiplication.addActionListener（this）;
		division.addActionListener（this）;
		setSize（700?80）;
		setVisible（true）;
		setDefaultCloseOperation（Jframe.EXIT_ON_CLOSE）;
	}

	public?void?plus（）?{
		try?{
			a?=?Double.parseDouble（numJtf1.getText（）.trim（））;
			b?=?Double.parseDouble（numJtf2.getText（）.trim（））;

		}?catch?（NumberFormatException?ex）?{
			JOptionPane.showMessage