java计算器内含源代码

XX 学院计算机科学与技术系实 验 报 告课程名称 程序设计基础实验(2)实验项目 应用系统的面向对象设计与分析实验类型 综合性实验完 成 人所在班级指导教师完成日期 2009 年 11 月 20 日实验报告正文一实验报告简表实验课题名称 计算器综合性实验项目 应用系统的面向对象设计与分析服务课程 程序设计基础实验(2)实验小组组长指导教师参与实验人员及其在实验课题中承担的主要任务(包括组长)学 号 小组成员姓名 班 级 在实验课题中的主要作用二、 实验内容1、 完成计算器的编写。2、 完成实验报告的写作.三、 实验要求1、理解并掌握图形界面的设计。2、理解整体算法的思路，即 actionPerformed()的算法.3、进一步学习 JAVA 的编程思想。四、 实验目的1、理解并掌握图形界面的设计。2、理解整体算法的思路，即 actionPerformed()的算法。3、通过设计成的计算器的按钮输入所需要计算的数字，根据自己所需进行加减乘除运算，得出结果。4、进一步学习 JAVA 的编程思想。五、 实验条件编译器：NetBeansJava 环境： JDK 6.0操作系统： Windows XP 六、 思路分析1. 在开始写计算器之前，用笔在纸上画出计算器的草图，显示屏的位置，每个按钮的位置及大小比列。2. 使用 setLayout(new GridLayout(6, 3, 10, 10);创建容器框框，使用 JPanel JPanel pane = new JPanel();pane.setLayout(new BorderLayout();pane.add(result, BorderLayout.NORTH);pane.add(number_key, BorderLayout.SOUTH);通过之前的草图将按钮位置排好，这样计算器的外部形状也 Ok。3. 图形边框解决了之后开始通过 getSource（）=“”去的事件源对象，进行实现按钮的输入；4. 这是计算器最关键的一步实现计算器的运算，首先定义四则运算的符号 i 。通过符号 i 实现加减乘除。如：switch (symbol) case 1 :double ad =total + Double.parseDouble(result.text.getText();result.text.setText(ad + “);i = 0;sum = “;break;实现加法。5.最后进行最后的测试，改正一些编写中的小错误，实现最后的结果。七、 程序代码import javax.swing.*;import java.awt.*;import java.awt.event.*;class Result extends JPanel JTextField text = new JTextField(“0“);Result() text.setHorizontalAlignment(SwingConstants.RIGHT);text.enable(false);setLayout(new BorderLayout();add(text, BorderLayout.CENTER);class Number_Key extends JPanel JButton zero = new JButton(“0“);JButton one = new JButton(“1“);JButton two = new JButton(“2“);JButton three = new JButton(“3“);JButton four = new JButton(“4“);JButton five = new JButton(“5“);JButton six = new JButton(“6“);JButton seven = new JButton(“7“);JButton eight = new JButton(“8“);JButton nine = new JButton(“9“);JButton plus = new JButton(“+“);JButton sub = new JButton(“-“);JButton mul = new JButton(“*“);JButton div = new JButton(“/“);JButton equal = new JButton(“=“);JButton ce = new JButton(“ce“);JButton point = new JButton(“.“);JButton tzero = new JButton(“00“);Number_Key() setLayout(new GridLayout(6, 3, 10, 10);add(seven);add(eight);add(nine);add(four);add(five);add(six);add(one);add(two);add(three);add(zero);add(tzero);add(plus);add(sub);add(mul);add(div);add(point);add(equal);add(ce);public class Calculator extends JFrame implements ActionListener Result result = new Result();Number_Key number_key = new Number_Key();boolean com = false;int i = 0;String sum = “;double total = 0;int symbol = 0;Calculator() super(“Calculator“);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel pane = new JPanel();pane.setLayout(new BorderLayout();pane.add(result, BorderLayout.NORTH);pane.add(number_key, BorderLayout.SOUTH);number_key.one.addActionListener(this);number_key.two.addActionListener(this);number_key.three.addActionListener(this);number_key.four.addActionListener(this);number_key.five.addActionListener(this);number_key.six.addActionListener(this);number_key.seven.addActionListener(this);number_key.eight.addActionListener(this);number_key.nine.addActionListener(this);number_key.zero.addActionListener(this);number_key.ce.addActionListener(this);number_key.plus.addActionListener(this);number_key.equal.addActionListener(this);number_key.sub.addActionListener(this);number_key.mul.addActionListener(this);number_key.div.addActionListener(this);number_key.tzero.addActionListener(this);number_key.point.addActionListener(this);setContentPane(pane);pack();public void actionPerformed(ActionEvent e) if (e.getSource() = number_key.one) if (com | i = 0) result.text.setText(“1“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “1“); else if (e.getSource() = number_key.two) if (com | i = 0) result.text.setText(“2“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “2“); else if (e.getSource() = number_key.three) if (com | i = 0) result.text.setText(“3“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “3“); else if (e.getSource() = number_key.four) if (com | i = 0) result.text.setText(“4“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “4“); else if (e.getSource() = number_key.five) if (com | i = 0) result.text.setText(“5“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “5“); else if (e.getSource() = number_key.six) if (com | i = 0) result.text.setText(“6“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “6“); else if (e.getSource() = number_key.seven) if (com | i = 0) result.text.setText(“7“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “7“); else if (e.getSource() = number_key.eight) if (com | i = 0) result.text.setText(“8“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “8“); else if (e.getSource() = number_key.nine) if (com | i = 0) result.text.setText(“9“);com = false;i = 1; else sum = result.text.getText();result.text.setText(sum + “9“);else if (e.getSource() = number_key.zero) if (com | i = 0) result.text.setText(“0“);com = false;i = 1; else sum = result.text.getText();if (Float.parseFloat(sum) 0 | Float.parseFloat(sum) 0 | Float.parseFloat(sum) 0) result.text.setText(sum + “00“); else if (sum.trim().indexOf(“.“) = -1) result.text.setText(sum); else result.text.setText(sum + “00“);else if (e.getSource() = number_key.point) if (com | i = 0) result.text.setText(“0.“);com = false;i = 1; else sum = result.text.getText();if (sum.trim().indexOf(“.“) = -1) result.text.setText(sum + “.“); else result.text.setText(sum);else if (e.getSource() = number_key.plus) com = true;i = 0;total = Double.parseDouble(result.text.getText();symbol = 1;else if (e.getSource() = number_key.sub) com = true;i = 0;total = Double.parseDouble(result.text.getText();symbol = 2;else if (e.getSource() = number_key.mul) com = true;i = 0;total = Double.parseDouble(result.text.getText();System.out.println(total);symbol = 3;else if (e.getSource() = number_key.div) com = true;i = 0;total = Double.parseDouble(result.text.getText();symbol = 4; else if (e.getSource() = number_key.equal) switch (symbol) case 1 :double ad =total + Double.parseDouble(result.text.getText();result.text.setText(ad + “);i = 0;sum = “;break;case 2 :double ad =total - Double.parseDouble(result.text.getText();result.text.setText(String.valueOf(ad);i = 0;sum = “;