/* 使用java编写的简易计算器，可以实现+，-,*,/四则运算。注意： 括号没有作用，就是一个装饰。待日后有时间定会更新。DEL是退格，CLC是清空。并带有日期，输入语法检测功能 */

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

import javax.swing.ScrollPaneConstants;

import javax.swing.Timer;

public class Calculator extends JFrame implements ActionListener

{

private String operandString = "";

public static Calculator cal;

private JTextArea textArea;

private JPanel panel;

private Container container;

private double[] operand = new double[100];

private int operandCount;

private String[] operator = new String[100];

private int operatorCount;

private JScrollPane jScrollPane;

public Calculator(String title)

{

super(title);

}

public Calculator()

{

operand = new double[200];

operator = new String[100];

cal = new Calculator("计算器");

cal.setTitle("Calculator");

container = cal.getContentPane();

container.setBackground(null);

cal.setBackground(new Color(100, 250, 150));

cal.setSize(320, 400);

cal.setLocation(100, 100);

container.setLayout(new GridLayout(0, 1, 2, 1));

new DateApplication().getNewInstance("");

showComponent();

cal.setDefaultCloseOperation(EXIT_ON_CLOSE);

cal.setResizable(false);

cal.setVisible(true);

}

private void showComponent()

{

// container.add(new JTextArea(40,20),BorderLayout.NORTH);

String textString = "789+456-123*0./=";

textArea = new JTextArea(1, 2);

jScrollPane = new JScrollPane(textArea);

System.out.println("jScrollPane=" + jScrollPane);

textArea.setBackground(Color.CYAN);

textArea.setForeground(Color.BLACK);

textArea.setEditable(false);

textArea.setFont(new Font("", Font.BOLD, 30)