java计算器实验报告马嘉良彭博王鹏

1、北京石油化工学院信息工程学院java实 验 报 告（2010/2011 学年 第 1 学期）课程名称Java语言程序设计任课教师张世博指导教师张世博小组成员马嘉良 彭博 王鹏学 号马090700彭090701 王090705年 级计算机092专 业计算机科学与技术综合成绩11 / 12文档可自由编辑打印实验名称计算器指导教师张世博一、 实验目的和要求1. 计算器程序（界面、事件编程）2. 处理输入数据的异常3. 记录用户的计算操作（包括正常计算与异常错误）到本地txt文件中，并记录时间，采用追加的方式。4. 10+4=142010-11-6 13:23:95. 9/3=3 2010-11-12

2、 21:19:126. 可发挥主观能动性添加其他内容作为加分项。7. 每三人（不超过三人）一个小组8. 采用程序现场讲解、提问及部分编程的考察方式9. 杜绝全盘拷贝！10. 验收时，请备好本小组的实验报告。四、实验小结（包括问题和解决方法、心得体会、意见与建议等） 通过本次试验，我们从中学习到了很多，复习了许多java的基本知识，培养了我们团队合作的精神，增进了我们之间的感情，此程序虽然已完成基本操作与少许额外的功能，但是还有诸多不足之处，在编程中对时间的输出感到比较困难，在团队人员的共同努力下，查阅许多资料后，终于解决了这一难题，锻炼了团队成员的坚忍不拔的精神，此次试验让我们在以后的学习生活

3、中受益良多。程序代码package calculate;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.*;import java.text.DateFormat;import java.util.Date;public class Calculator extends JFrame implements ActionListener,KeyListenerprivate JPanel p1, p2; private JButton numbers;private JButton b11

4、, b12, b13, b14, b15, b16, b17, b18, b19, b20;private boolean dotExist, operated, equaled; / 帮助运算的布尔变量 private double storedNumber; / 目前的结果 private char lastOperator; / 上一运算符private JTextField t = new JTextField(20);static StringBuffer buffer = new StringBuffer(); public Calculator() t.setText("

5、;0"); t.setEditable(false); storedNumber = 0; lastOperator = '?' setTitle("calculator"); dotExist = false; / 表示当前的数是否有小数点 operated = false; / 表示任意运算符是否被按下 equaled = false; / 表示等号是否被按下 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); p1 = new JPanel(); p2 = new JPanel(); p1.setL

6、ayout(new FlowLayout(); p2.setLayout(new GridLayout(5, 4, 10, 10); numbers = new JButton10; for (int i = 0; i < 10; i+) numbersi = new JButton("" + i); numbersi.addActionListener(this); b11 = new JButton("+"); b11.addActionListener(this); b12 = new JButton("-"); b12.

7、addActionListener(this); b13 = new JButton("*"); b13.addActionListener(this); b14 = new JButton("/"); b14.addActionListener(this); b15 = new JButton(""); b15.addActionListener(this); b16 = new JButton("¡À"); b16.addActionListener(this); b17 = new JBu

8、tton("x2"); b17.addActionListener(this); b18 = new JButton("="); b18.addActionListener(this); b19 = new JButton("."); b19.addActionListener(this); b20 = new JButton("C"); b20.addActionListener(this); p1.add(t); for (int i = 0; i < 10; i+) p2.add(numbersi);

9、p2.add(b11); p2.add(b12); p2.add(b13); p2.add(b14); p2.add(b15); p2.add(b16); p2.add(b17); p2.add(b18); p2.add(b19); p2.add(b20); Container c = getContentPane(); c.add(p1, "North"); c.add(p2,"Center"); this.setSize(320, 240); this.setVisible(true); t.addKeyListener(this); public

10、void actionPerformed(ActionEvent e) JButton btn = (JButton)e.getSource(); if(btn = b20) t.setText("0"); t.setEditable(false); storedNumber = 0; lastOperator = '?' dotExist = false; / 表示当前的数是否有小数点 operated = false; / 表示任意运算符是否被按下 equaled = false; / 表示等号是否被按下 else if (btn = b18) calc

11、ulator('='); equaled = true; else if (btn = b11) calculator('+'); equaled = false; else if (btn = b12) calculator('-'); equaled = false; else if (btn = b13) calculator('*'); equaled = false; else if (btn = b14) calculator('/'); equaled = false; else if(btn = b

12、15) calculator('s'); calculator('='); equaled = true; else if (btn = b16) calculator('p'); equaled = false; t.setText("-"+storedNumber); else if (btn = b17) calculator(''); calculator('='); equaled = true; else if (equaled) storedNumber = 0; for (int

13、 i = 0; i < 10; i+) if (btn = numbersi) if (t.getText().equals("0") t.setText("" + i); else if(! operated) t.setText(t.getText() + i); else t.setText("" + i); operated = false; if (btn = b19 && ! dotExist) t.setText(t.getText() + "."); dotExist = tr

14、ue; private void calculator(char d) double currentNumber = Double.valueOf(t.getText().doubleValue(); if (lastOperator = '?') storedNumber = currentNumber; else if (lastOperator = '+') record('+',storedNumber,currentNumber); storedNumber += currentNumber; record1(d,storedNumbe

15、r); else if (lastOperator = '-') record('-',storedNumber,currentNumber); storedNumber -= currentNumber; else if (lastOperator = '*') record('*',storedNumber,currentNumber); storedNumber *= currentNumber; record1(d,storedNumber); else if (lastOperator = '/') re

16、cord('/',storedNumber,currentNumber); storedNumber /= currentNumber; record1(d,storedNumber); else if (lastOperator = 'p') storedNumber *= -1; else if (lastOperator = 's') record('s',storedNumber,currentNumber); storedNumber = Math.sqrt(currentNumber); record1(d,store

17、dNumber); else if (lastOperator = '') record('',storedNumber,currentNumber); storedNumber = currentNumber * currentNumber; record1(d,storedNumber); else if (lastOperator = '=' && equaled) storedNumber = currentNumber; t.setText("" + storedNumber); operated =

18、 true; lastOperator = d; public void record(char d,double storedNumber,double currentNumber) buffer = buffer.append(storedNumber); buffer = buffer.append(d); buffer = buffer.append(currentNumber); public void record1(char d,double storedNumber) buffer = buffer.append('='); buffer = buffer.ap

19、pend(storedNumber); Date dt = new Date(); DateFormat fullDateFormat = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL); System.out.println(fullDateFormat.format(dt); buffer = buffer.append(" " + dt + " "); buffer = buffer.append("rn"); System.out.println

20、(buffer); try F1=new ("D:Wendang.txt"); DataOutputStream F2=new DataOutputStream(F1); F2.writeBytes(buffer.toString(); F2.close(); catch(IOException ioe) public void keyPressed(KeyEvent arg0) int numbers = new int10;numbers0 = KeyEvent.VK_0;numbers1 = KeyEvent.VK_1;numbers2 = KeyEvent.VK_2

21、;numbers3 = KeyEvent.VK_3;numbers4 = KeyEvent.VK_4;numbers5 = KeyEvent.VK_5;numbers6 = KeyEvent.VK_6;numbers7 = KeyEvent.VK_7;numbers8 = KeyEvent.VK_8;numbers9 = KeyEvent.VK_9;int a = arg0.getKeyCode();tryif(a = KeyEvent.VK_C ) t.setText("0"); t.setEditable(false); storedNumber = 0; lastOp

22、erator = '?' dotExist = false; / 表示当前的数是否有小数点 operated = false; / 表示任意运算符是否被按下 equaled = false; / 表示等号是否被按下else if (a = KeyEvent.VK_ENTER) calculator('='); equaled = true; else if (a = KeyEvent.VK_ADD) calculator('+'); equaled = false; else if (a = KeyEvent.VK_SUBTRACT) calculator('-'); equaled = false; else if (a = KeyEvent.VK_MULTIPLY) calculator('*'); equaled = false; else if (a = KeyEvent.VK_DIVIDE) calculator('/'); equaled = false; else if (equaled) storedNumber = 0; for (int i = 0; i < 10; i+) i