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1、Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-dateJava实现的简易计算器-附代码Java实现的简易计算器-附代码 Java实验报告题目： 简易计算器 学 院 数学与计算机学院 学科门类 工 学 专 业 软件工程 学 号 2010434004 姓 名 指导教师 2012年 12月 25 日一、实验目的通过Java程序开发实训使学生掌握面向对象程序设计(Java)课堂讲授的内容，灵活运用到Java程序的开发与设计中。1
2、. 了解Java中的类与对象，类及成员的定义 2. 掌握运算符与基本的表达式，和异常的处理 3. 数组与字符串的应用 4. 掌握常用的Java系统类，核心语言包（java.lang），工具包（java.util），数学包（java.math） 5. 接口的实现，输入输出的处理和可视化程序设计二、实验要求应用Java语言，设计一个简易计算器，要求界面简洁，能完成基本运算功能。三、实验内容1. 进行图形界面设计 应用JFrame类、JPanel类、5种布局管理器、文本框、标签及按钮等。2. 实现计算器的基本功能包括加减乘除四则运算、倒数、取余、平方根、三角函数及清除结果等功能。四、设计方案1、设计
3、流程图2、界面的设计：Swing布局。界面设计中有用到swing组件的TextField和Button，用到awt中的BorderLayout和GridLayout布局管理方式。设计主界面框架布局为默认的BorderLayout布局，申请三个面板分别是：（1）输入输出面板，布局设置为两行一列的网格GridLayout布局，包括两个JTextField文本框，一个负责显示当前输入信息，一个负责显示计算式。面板设置为面板的上部，即f.add(inputPanel，BorderLayout.NORTH);（2）数字按钮及运算按钮面板，设置为4行5列的网格布局，包括09的10个数字和加、减、乘、除、乘
4、方、开方、取倒、取余、等于按钮。面板位置在主界面的下部，即f.add(buttonsPanel，BorderLayout.SOUTH);（3）功能键面板， 包括三角函数，清除，退格等按钮。面板位置在主界面框架的中部。即f.add(operationPanel，BorderLayout.CENTER)。其图形界面如下:3、数据输入：鼠标事件响应。分别定义三个类，一个是NumberMouseListener类来响应数字点击事件，另外一个是CalcMouseListener 类来响应包括开方、乘方在内的运算按钮的点击事件，最后是OperationMouseListener类用来响应退格、清除等功能键
5、的点击事件，三个类都分别实现鼠标监听MouseListener接口。对每个按钮设置对应监听。4、数据处理：整型和浮点数处理，计算器的核心功能实现。在CalcMouseListener 类中对根据事件源的分析，完成用户要求的运算，将结果输出到文本框中。五、实验结果1、四则运算功能2、扩张的其他运算功能六、程序代码public class Calculator /计算器面板private JFrame f = new JFrame(Calculator); private JPanel inputPanel = new JPanel();/输入面扳private JPanel operationP
6、anel = new JPanel();/加减乘除面板private JPanel buttonsPanel = new JPanel();/数字面板private JTextField input = new JTextField(20); /输入数据文本框private JTextField show=new JTextField(20);private JButton backspace = new JButton(退格);/退格键private JButton CE = new JButton(CE );/清空private JButton C = new JButton(C);/删除
7、private JButton sqrt=new JButton();/开方private JButton fang=new JButton();/乘方private JButton mod=new JButton(%);/取余private JButton dao=new JButton(1/x);/取倒数private JButton sin=new JButton(sin);private JButton cos=new JButton(cos);private JButton lg=new JButton(ln);/四则运算符号键private JButton add = new JB
8、utton(+);private JButton sub = new JButton(-);private JButton mul = new JButton(*);private JButton div = new JButton(/);/小数点private JButton decimal = new JButton(.);/等号private JButton equal = new JButton(=);/数字键private JButton zero = new JButton(0);private JButton one = new JButton(1);private JButto
9、n two = new JButton(2);private JButton three = new JButton(3);private JButton four = new JButton(4);private JButton five = new JButton(5);private JButton six = new JButton(6);private JButton seven = new JButton(7);private JButton eight = new JButton(8);private JButton nine = new JButton(9);private S
10、tring num1 = ;/保存第一个运算数字private String operator = ;/保存运算符号public static void main(String args) new Calculator();/new计算器实例public Calculator() /添加组件，布局show.setText(0);show.setEditable(false); /不可编辑show.setHorizontalAlignment(JTextField.RIGHT);input.setText(0);input .setEditable(false);input.setHorizon
11、talAlignment(JTextField.RIGHT);inputPanel.setLayout(new GridLayout(2,1);inputPanel.add(show);inputPanel.add(input);/添加输入文本框f.add(inputPanel, BorderLayout.NORTH);operationPanel.add(sin);sin.setBackground(new Color(100, 255, 10);operationPanel.add(cos);cos.setBackground(new Color(100, 255, 10);operati
12、onPanel.add(CE);CE.setBackground(new Color(100, 255, 10);operationPanel.add(C);C.setBackground(new Color(100, 255, 10);operationPanel.add(backspace);backspace.setBackground(new Color(100, 255, 10);f.add(operationPanel, BorderLayout.CENTER);buttonsPanel.setLayout(new GridLayout(4, 5); buttonsPanel.ad
13、d(seven);buttonsPanel.add(eight);buttonsPanel.add(nine);buttonsPanel.add(div);buttonsPanel.add(mod);buttonsPanel.add(four);buttonsPanel.add(five);buttonsPanel.add(six);buttonsPanel.add(mul);buttonsPanel.add(fang);buttonsPanel.add(one);buttonsPanel.add(two);buttonsPanel.add(three);buttonsPanel.add(su
14、b);buttonsPanel.add(sqrt);buttonsPanel.add(zero);buttonsPanel.add(decimal);buttonsPanel.add(equal);buttonsPanel.add(add);buttonsPanel.add(dao);f.add(buttonsPanel, BorderLayout.SOUTH);/注册各个组件监听事件backspace.addMouseListener(new OperationMouseListener();CE.addMouseListener(new OperationMouseListener();C
15、.addMouseListener(new OperationMouseListener();decimal.addMouseListener(new OperationMouseListener();equal.addMouseListener(new OperationMouseListener();/注册运算监听add.addMouseListener(new CalcMouseListener();sub.addMouseListener(new CalcMouseListener();mul.addMouseListener(new CalcMouseListener();div.a
16、ddMouseListener(new CalcMouseListener();sqrt.addMouseListener(new CalcMouseListener();fang.addMouseListener(new CalcMouseListener();mod.addMouseListener(new CalcMouseListener();dao.addMouseListener(new CalcMouseListener();sin.addMouseListener(new CalcMouseListener();cos.addMouseListener(new CalcMous
17、eListener();/注册数字监听事件zero.addMouseListener(new NumberMouseListener();one.addMouseListener(new NumberMouseListener();two.addMouseListener(new NumberMouseListener();three.addMouseListener(new NumberMouseListener();four.addMouseListener(new NumberMouseListener();five.addMouseListener(new NumberMouseLis
18、tener();six.addMouseListener(new NumberMouseListener();seven.addMouseListener(new NumberMouseListener();eight.addMouseListener(new NumberMouseListener();nine.addMouseListener(new NumberMouseListener();f.setVisible(true);f.pack();/窗口自适应大小f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);private class
19、NumberMouseListener implements MouseListenerpublic void mouseClicked(MouseEvent e) /if(operator=)if(input.getText().trim().equals(0)|input.getText().trim().equals()/如果文本框已经是0，结果还是0 input.setText(JButton)e.getSource().getText().trim();else/否则的话，把新输入的数添加到原有数的后边input.setText(input.getText().concat(JBut
20、ton)e.getSource().getText().trim();if(operator=)show.setText();public void mouseEntered(MouseEvent e) public void mouseExited(MouseEvent e) public void mousePressed(MouseEvent e) public void mouseReleased(MouseEvent e) private class CalcMouseListener implements MouseListener/如果输入的是运算符号，保存第一个结果和运算符号p
21、ublic void mouseClicked(MouseEvent e) double s=0;if(JButton)e.getSource().getText().trim()=- )if(input.getText().trim().equals(0)|input.getText().trim().equals()input.setText(-);return;if(e.getSource()=sqrt)double t=Math.sqrt(Double.parseDouble(input.getText().trim();input.setText(new DecimalFormat(
22、0.00).format(t);else if(e.getSource()=dao)double t=1/Double.parseDouble(input.getText().trim();input.setText(new DecimalFormat(0.00).format(t);else if(e.getSource()=sin)double t=Math.sin(Double.parseDouble(input.getText().trim();input.setText(new DecimalFormat(0.00).format(t);else if(e.getSource()=c
23、os)double t=Math.cos(Double.parseDouble(input.getText().trim();input.setText(new DecimalFormat(0.00).format(t);elseif(operator=)num1 = input.getText().trim();operator = (JButton)e.getSource().getText().trim();show.setText(input.getText().concat(JButton)e.getSource().getText().trim();input.setText(0)
24、;else /实现连续运算if(operator.equals(+)/执行加法运算s = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim();else if(operator.equals(-)/减法运算s = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim();else if(operator.equals(*)/乘法运算s = Double.parseDouble(num1) * Double.parseDouble(i
25、nput.getText().trim();else if(operator.equals(/)/除法运算s = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim();else if(operator.equals()/乘方运算s=Math.pow(Double.parseDouble(num1), Double.parseDouble(input.getText().trim();else if(operator.equals(%)/取余运算s=getMod(Double.parseDouble(num1),
26、 Double.parseDouble(input.getText().trim();num1 =new DecimalFormat(0.00).format(s);show.setText(num1.concat(JButton)e.getSource().getText().trim();input.setText(0);operator=(JButton)e.getSource().getText().trim();private double getMod(double a, double b) / TODO Auto-generated method stubdouble s=0;i
27、f(a 0)input.setText(inputText.substring(0, inputText.length() - 1);else if(inputText.length()=0 & showText.length()0) input.setText(showText.substring(0,showText.length()-1); show.setText(0);else if(e.getSource() = C)input.setText(0);/C，清空所有运算数字和符号show.setText(0);num1 = ;operator=;else if(e.getSourc
28、e() = CE)input.setText(0);/CE-将文本框置为0else if(e.getSource() = decimal)String text = input.getText().trim();/如果按了小数点，如果文本框已经有小数点，不做任何操作，否则在结果后面加上小数点if(text.indexOf(.) = -1)input.setText(text.concat(.);else if(e.getSource() = equal)/输入操作符后 点击的等于号 两个数做正常计算if(!operator.trim().equals()if(!input.getText().
29、trim().equals()show.setText(show.getText().concat(input.getText().concat(=);double result = 0;if(operator.equals(+)/执行加法运算result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim();else if(operator.equals(-)/减法运算result = Double.parseDouble(num1) - Double.parseDouble(input.getText(
30、).trim();else if(operator.equals(*)/乘法运算result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim();else if(operator.equals(/)/除法运算result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim();else if(operator.equals()result=Math.pow(Double.parseDouble(num1), Double
31、.parseDouble(input.getText().trim();else if(operator.equals(%)/取余运算result=getMod(Double.parseDouble(num1), Double.parseDouble(input.getText().trim(); /格式化最终结果，保留两位小数点input.setText(new DecimalFormat(0.00).format(result);operator=;num1=;private double getMod(double a, double b) / TODO Auto-generated method stubdouble s=0;if(ab)s=a;else if(a=b)s=0;elses=a%b;return s;public void mouseEntered(MouseEvent e) public void mouseExited(MouseEvent e) public void mousePressed(MouseEvent e) public void mouseReleased(MouseEvent e) -