GUI实现计算器

package java6799.calc;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class TaskCalculator6799 extends JFrame {
	private JTextField txtResult;
	private JButton btnClear;
	private JPanel p1, p2;

	public TaskCalculator6799() {
		super("计算器");
		this.setSize(230, 230);
		this.setLocation(200, 100);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		initUI6799();
		this.setVisible(true);
		// 设置窗口大小不可改变
		this.setResizable(false);
	}

	private void initUI6799() {
		p1 = new JPanel();
		btnClear = new JButton("清空");
		txtResult = new JTextField(13);

		p1.add(txtResult);
		p1.add(btnClear);
		this.add(p1, BorderLayout.NORTH);

		p2 = new JPanel(new GridLayout(4, 4));

		// 定义一个字符串，存储计算器中按钮上的文字，文字的排列与排列顺序一致
		// 目的：通过循环语句向窗体添加按钮
		String name = "789+456-123*0.=/";
		for (int i = 0; i < name.length(); i++) {
			JButton jb = new JButton("" + name.charAt(i));
			jb.addActionListener(new ButtonClick6799());
			p2.add(jb);
		}
		this.add(p2, BorderLayout.CENTER);
		//为按钮添加清空功能
		btnClear.addMouseListener(new myMouseAdapter());
	}

	public static void main(String[] args) {
		new TaskCalculator6799();
	}

	class ButtonClick6799 implements ActionListener {
		double number1, number2, result;
		String number = null, operator = "+";

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			// 如果是数字
			if (e.getActionCommand().matches("[0-9\\.]")) {
				// 在文本框中显示
				number = txtResult.getText() + e.getActionCommand();
				txtResult.setText(number);
			}
			// 如果是加减乘除
			else if (e.getActionCommand().matches("[\\+\\-\\*/]")) {
				// 将文本框中的数据作为第一个数
				number1 = Double.valueOf(txtResult.getText());
				// 在文本框中显示
				txtResult.setText(txtResult.getText() + e.getActionCommand());
				// 给运算符赋值
				operator = e.getActionCommand();

			}
			// 如果是等于号
			else if (e.getActionCommand().matches("[=]")) {
				// 通过正则表达式拆分字符串并将字符串存入字符数组里面
				String[] splited = txtResult.getText().split("[\\+\\-\\*/]");
				// 在文本框中显示
				txtResult.setText(txtResult.getText() + e.getActionCommand());
				// 取数组的第一个赋值给number1
				number1 = Double.valueOf(splited[0]);
				// 取数组的第二个赋值给number2
				number2 = Double.valueOf(splited[1]);

				// 进行计算
				switch (operator) {
				case "+":
					result = number1 + number2;
					break;
				case "-":
					result = number1 - number2;
					break;
				case "*":
					result = number1 * number2;
					break;
				case "/":
					result = number1 / number2;
					break;
				}

				// 将结果输出在 文本框
				txtResult.setText(txtResult.getText() + Double.toString(result));
			}

		}

	}
	//鼠标点击事件适配器
	class myMouseAdapter extends MouseAdapter{
		@Override
		public void mouseClicked(MouseEvent e) {
			// TODO Auto-generated method stub
			txtResult.setText("");
		}
	}
}