Java计算器实验报告.doc

一、目标：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。二、要求：按时参加Java程序开发实训训练，不得迟到和早退；独立完成程序设计；按要求撰写实践报告。三、详细内容：使用面向对象程序设计(Java)课程讲授内容，编写一个简单的计算器，要求实现如下功能：1. 进行图形界面设计 通过图形界面设计，掌握JFrame类、JPanel类、5种布局管理器、文本框、标签及按钮的使用方法。2. 实现计算器的基本功能包括加减乘除四则运算、倒数、平方根及清除结果等功能。3. 实现计算器的存储计算功能 包括存储中间结果（MS）、使用中间结果（MR）、累加中间结果（M+）及清除中间结果（MC）的功能。4. 计算器的扩展功能包括乘方、对数、正弦、余弦、正切、余切、反正弦、反余弦、反正切、反余切及2进制、8进制、16进制、10进制之间的相互转换等功能。四、源代码 import java.awt.BorderLayout;import java.awt.Color;import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.text.DecimalFormat;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;public class jsq implements ActionListener /导入动作监听接口/设计面板中的单位 JFrame frame;/窗口 JTextField textAnswer;/文本 JPanel panel, panel1, panel2, panel3;/面版 JMenuBar mainMenu;/菜单 JTextField textMemory; JLabel labelMemSpace; /labelMemSpace单纯做摆设，控制面板的形状 JButton buttonBk, buttonCe, buttonC; JButton button;/按钮数组 JButton buttonMC, buttonMR, buttonMS, buttonMAdd;/清除,使用,储存,添加 JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul, buttonDiv, buttonMod; JButton buttonSqrt, buttonDao, buttonEqual; JMenu editMenu, viewMenu, helpMenu; JMenuItem copyItem, pasteItem, tItem, sItem, numberGroup, topHelp, aboutCal; DecimalFormat df; /设置数据输出精度 boolean clickable; /控制当前能否按键 double memoryd; /使用内存中存储的数字 int memoryi; double vard, answerd; /用来保存double型数据的中间值(vard)和最后结果(answerd) short key = -1, prekey = -1; /key用来保存当前进行何种运算,prekey用来保存前次进行何种运算 String copy; /做复制用 JTextArea help; /帮助 JScrollPane scrollHelp; /构造函数 public jsq() clickable = true; answerd = 0; frame = new JFrame(计算器); df = new DecimalFormat(0.#); /设置数据输出精度(对于double型值) textAnswer = new JTextField(15); textAnswer.setText(); textAnswer.setEditable(false); textAnswer.setBackground(new Color(255, 255, 255); panel = new JPanel(); frame.getContentPane().add(panel); panel1 = new JPanel(); panel2 = new JPanel(); panel.setLayout(new BorderLayout(); /设计整个面板 mainMenu = new JMenuBar(); editMenu =new JMenu(编辑(E); editMenu .setMnemonic(KeyEvent.VK_E); viewMenu =new JMenu(查看(V); viewMenu .setMnemonic(KeyEvent.VK_V); helpMenu =new JMenu(帮助(H); helpMenu .setMnemonic(KeyEvent.VK_H); mainMenu .add(editMenu ); mainMenu .add(viewMenu ); mainMenu .add(helpMenu ); panel.add(mainMenu, BorderLayout.NORTH); panel.add(textAnswer, BorderLayout.CENTER); panel.add(panel1, BorderLayout.SOUTH); panel1.setLayout(new BorderLayout(); textMemory = new JTextField(3); textMemory.setEditable(false); textMemory.setBackground(new Color(217, 217, 217); labelMemSpace = new JLabel( ); buttonBk = new JButton(Backspace); buttonBk.setForeground(new Color(255, 0, 0); buttonCe = new JButton(CE); buttonCe.setForeground(new Color(255, 0, 0); buttonC = new JButton(C); buttonC.setForeground(new Color(255, 0, 0); buttonBk.addActionListener(this); buttonCe.addActionListener(this); buttonC.addActionListener(this); panel1.add(panel2, BorderLayout.NORTH); panel2.setLayout(new FlowLayout(FlowLayout.RIGHT); panel2.add(textMemory); panel2.add(labelMemSpace); panel2.add(buttonBk); panel2.add(buttonCe); panel2.add(buttonC); panel3 = new JPanel(); panel1.add(panel3, BorderLayout.CENTER); button = new JButton10; for (int i = 0; i button.length; i+) buttoni = new JButton(Integer.toString(i); buttoni.setForeground(new Color(0, 0, 255); /构造按钮 buttonMC = new JButton(MC); buttonMC.setForeground(new Color(255, 0, 0); buttonMR = new JButton(MR); buttonMR.setForeground(new Color(255, 0, 0); buttonMS = new JButton(MS); buttonMS.setForeground(new Color(255, 0, 0); buttonMAdd = new JButton(M+); buttonMAdd.setForeground(new Color(255, 0, 0); buttonDot = new JButton(.); buttonDot.setForeground(new Color(0, 0, 255); buttonAddAndSub = new JButton(+/-); buttonAddAndSub.setForeground(new Color(0, 0, 255); buttonAdd = new JButton(+); buttonAdd.setForeground(new Color(255, 0, 0); buttonSub = new JButton(-); buttonSub.setForeground(new Color(255, 0, 0); buttonMul = new JButton(*); buttonMul.setForeground(new Color(255, 0, 0); buttonDiv = new JButton(/); buttonDiv.setForeground(new Color(255, 0, 0); buttonMod = new JButton(%); buttonMod.setForeground(new Color(0, 0, 255); buttonSqrt = new JButton(sqrt); buttonSqrt.setForeground(new Color(0, 0, 255); buttonDao = new JButton(1/x); buttonDao.setForeground(new Color(0, 0, 255); buttonEqual = new JButton(=); buttonEqual.setForeground(new Color(255, 0, 0); /将所有行为与监听绑定 panel3.setLayout(new GridLayout(4, 6); panel3.add(buttonMC); buttonMC.addActionListener(this); panel3.add(button7); button7.addActionListener(this); panel3.add(button8); button8.addActionListener(this); panel3.add(button9); button9.addActionListener(this); panel3.add(buttonDiv); buttonDiv.addActionListener(this); panel3.add(buttonSqrt); buttonSqrt.addActionListener(this); panel3.add(buttonMR); buttonMR.addActionListener(this); panel3.add(button4); button4.addActionListener(this); panel3.add(button5); button5.addActionListener(this); panel3.add(button6); button6.addActionListener(this); panel3.add(buttonMul); buttonMul.addActionListener(this); panel3.add(buttonMod); buttonMod.addActionListener(this); panel3.add(buttonMS); buttonMS.addActionListener(this); panel3.add(button1); button1.addActionListener(this); panel3.add(button2); button2.addActionListener(this); panel3.add(button3); button3.addActionListener(this); panel3.add(buttonSub); buttonSub.addActionListener(this); panel3.add(buttonDao); buttonDao.addActionListener(this); panel3.add(buttonMAdd); buttonMAdd.addActionListener(this); panel3.add(button0); button0.addActionListener(this); panel3.add(buttonAddAndSub); buttonAddAndSub.addActionListener(this); panel3.add(buttonDot); buttonDot.addActionListener(this); panel3.add(buttonAdd); buttonAdd.addActionListener(this); panel3.add(buttonEqual); buttonEqual.addActionListener(this); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.show(); /设置各个按钮行为 public void actionPerformed(ActionEvent event) boolean sign = false; /判断是否是double型数参与运算，是为true，不是为false Object temp = event.getSource(); try /如果按下数据按钮，将按下的按钮代表的数据插入的当前文本框字符串之后 for (int i = 0; i = 9; i+) if (temp = buttoni & clickable = true) textAnswer.setText(textAnswer.getText() + Integer.toString(i); /按下.按钮时，判断当前文本框内字符串中含不含.，如果已含，则不允许再插入. if (temp = buttonDot & clickable = true) boolean isDot = false; if (textAnswer.getText().length() = 0) isDot = true; for (int i = 0; i textAnswer.getText().length(); i+) if (. = textAnswer.getText().charAt(i) isDot = true; break; if (isDot = false) textAnswer.setText(textAnswer.getText() + .); if (temp = buttonAdd | temp = buttonSub | temp = buttonMul | temp = buttonDiv) & clickable = true) /+操作 if (temp = buttonAdd) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) /textAnswer=aa; textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 0; /-操作 if (temp = buttonSub) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 1; /*操作 if (temp = buttonMul) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); /textAnser = ; textAnswer.setText(); prekey = key = 2; /操作 if (temp = buttonDiv) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 3; /=操作 if (temp = buttonEqual & clickable = true) /如果连续按=,则进行连续运算 if (prekey = 5) if (key = 0) answerd += vard; textAnswer.setText(df.format(answerd); if (key = 1) answerd -= vard; textAnswer.setText(df.format(answerd); if (key = 2) answerd *= vard; textAnswer.setText(df.format(answerd); if (key = 3) if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= vard; textAnswer.setText(df.format(answerd); else vard = Double.parseDouble(textAnswer.getText(); if (key = 0) prekey = -1; answerd += Double.parseDouble(textAnswer.getText(); textAnswer.setText(df.format(answerd); if (key = 1) prekey = -1; answerd -= Double.parseDouble(textAnswer.getText(); textAnswer.setText(df.format(answerd); if (key = 2) prekey = -1; answerd *= Double.parseDouble(textAnswer.getText(); textAnswer.setText(df.format(answerd); if (key = 3) prekey = -1; if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); textAnswer.setText(df.format(answerd); prekey = 5; /%操作，对第二个操作数除以100 if (temp = buttonMod & clickable = true) if (answerd = 0) String s = textAnswer.getText(); textAnswer.setText(s); else boolean isDot = false; for (int i = 0; i textAnswer.getText().length(); i+) if (. = textAnswer.getText().charAt(i) isDot = true; break; /如果是double数，除100 if (isDot = true) double dtemp = Double.parseDouble(textAnswer.getText(); dtemp = dtemp / 100.0; textAnswer.setText(Double.toString(dtemp); else /如果是int数但能被100整除，则去掉末尾两个零 if (Integer.parseInt(textAnswer.getText() % 100 = 0) int itemp = Integer.p