package?test;

import?java.awt.BorderLayout;
import?java.awt.GridLayout;
import?java.awt.TextArea;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?java.math.BigDecimal;
import?java.util.Scanner;

import?javax.swing.JButton;
import?javax.swing.Jframe;
import?javax.swing.JPanel;
import?javax.swing.JTextArea;
import?javax.swing.JTextField;

public?class?Computer?implements?ActionListener?{
	private?JTextField?jtf?=?new?JTextField（“0“?20）;
	private?TextArea?jta?=?new?TextArea（““?5?20）;
	private?String?history?=?““;
	private?String?operator?=?“+“;
	private?String?s?=?“0“;
	private?boolean?append?=?false;

	public?Computer（）?{
		Jframe?jf?=?new?Jframe（）;
		JPanel?jp?=?new?JPanel（new?GridLayout（5?5?5?5））;
		String[]?button?=?{?““?“

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????4067??2009-06-16?09:12??Computer.java

-----------?---------??----------?-----??----

?????????????????4067????????????????????1