Java---计算器（标准计算器，科学计算器）的实现

Java-计算器（标准计算器和科学计算器）的实现
/ 需要说明这里的文本框中并不能呈现出算数表达式，有时间改进
可以先建两个类，一个是Biaozhun 用来实现标准计算器，另一个是Kexue 用来实现科学计算器

通过功能菜单实现科学计算器和标准计算器的转换

具体代码中，在Biaozhun类和 Kexue类各自定义相对应的事件来实现转换

menuItem_1.addActionListener(new ActionListener()
menuItem.addActionListener(new ActionListener()

对于每一个按钮也要设置相应的事件响应（详情见代码）

代码部分

首先是标准计算器的实现

package dazuoye;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class Biaozhun extends JFrame implements ActionListener {private final String[] KEYS = { "*", "/", "7", "8", "9","+", "4", "5", "6", "-", "1", "2", "3", "|x|","0",".","=", "1/x" };private final String[] COMMAND = { "Back", "C" };private JButton keys[] = new JButton[KEYS.length];private JButton commands[] = new JButton[COMMAND.length];private JTextField resultText = new JTextField("0");private boolean firstDigit = true;private double resultNum = 0.0;private String operator = "=";private boolean operateValidFlag = true;StringBuffer sb = new StringBuffer();String vl = null;public Biaozhun() {setTitle("标准型");this.setBackground(Color.LIGHT_GRAY);this.setTitle("标准计算器");this.setLocation(500, 300);this.setSize(500, 500);this.setResizable(false);JMenuBar menuBar = new JMenuBar();setJMenuBar(menuBar);JMenu menu = new JMenu("功能");menuBar.add(menu);JMenuItem menuItem = new JMenuItem("标准型");menu.add(menuItem);JMenuItem menuItem_1 = new JMenuItem("科学型");menu.add(menuItem_1);menuItem_1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent arg0) {Kexue science = new Kexue();science.setVisible(true);}});resultText.setHorizontalAlignment(JTextField.RIGHT);resultText.setBackground(Color.white);resultText.setFont(new Font("TimesRoman",Font.BOLD,46));JPanel PPanel = new JPanel();PPanel.setLayout(new GridLayout(5, 4, 3, 3));for (int i = 0; i < COMMAND.length; i++) {commands[i] = new JButton(COMMAND[i]);PPanel.add(commands[i]);commands[i].setFont(new Font("Courir",Font.PLAIN,20));}for (int i = 0; i < KEYS.length; i++) {keys[i] = new JButton(KEYS[i]);PPanel.add(keys[i]);keys[i].setFont(new Font("Courir",Font.ITALIC,20));}JPanel panel1 = new JPanel();panel1.setLayout(new BorderLayout(3,3));panel1.add("Center", PPanel);JPanel top = new JPanel();top.setLayout(new BorderLayout());top.add("Center", resultText);getContentPane().setLayout(new BorderLayout(3, 5));getContentPane().add("North", top);getContentPane().add("Center", panel1);for (int i = 0; i < KEYS.length; i++) {keys[i].addActionListener(this);}for (int i = 0; i < COMMAND.length; i++) {commands[i].addActionListener(this);}}public void actionPerformed(ActionEvent e) {String label = e.getActionCommand();if (label.equals(COMMAND[0])) {handleBack();} else if (label.equals(COMMAND[1])) {handleC();} else if ("0123456789.".indexOf(label) >= 0) {handleNumber(label);} elsehandleOperator(label);}private void handleBack() {String text = resultText.getText();int i = text.length();if (i > 0) {text = text.substring(0, i - 1);if (text.length() == 0) {resultText.setText("0");firstDigit = true;operator = "=";}elseresultText.setText(text);}}private void handleNumber(String key) {if (firstDigit) {resultText.setText(key);}else if ((key.equals(".")) && (resultText.getText().indexOf(".") < 0)) {resultText.setText(resultText.getText() + ".");}else if (!key.equals(".")) {resultText.setText(resultText.getText() + key);}firstDigit = false;}private void handleC() {resultText.setText("0");firstDigit = true;operator = "=";}private void handleOperator(String key) {if (operator.equals("/")) {if (getNumberFromText() == 0.0) {operateValidFlag = false;resultText.setText("除数不能为零");}else resultNum /= getNumberFromText();} else if (operator.equals("1/x")) {if (resultNum == 0.0) {operateValidFlag = false;resultText.setText("零没有倒数");}elseresultNum = 1 / resultNum;}else if (operator.equals("+")) {resultNum += getNumberFromText();}else if (operator.equals("-")) {resultNum -= getNumberFromText();}else if (operator.equals("*")) {resultNum *= getNumberFromText();}else if (operator.equals("|x|")) {resultNum = Math.abs(resultNum);}else if (operator.equals("=")) {resultNum = getNumberFromText();}if (operateValidFlag) {long t1;double t2;t1 = (long) resultNum;t2 = resultNum - t1;if (t2 == 0) {resultText.setText(String.valueOf(t1));}else {resultText.setText(String.valueOf(resultNum));}}operator = key;firstDigit = true;operateValidFlag = true;}private double getNumberFromText() {double result = 0;try {result = Double.valueOf(resultText.getText()).doubleValue();} catch (NumberFormatException e) {}return result;}public static void main(String args[]) {Biaozhun application = new Biaozhun();application.setVisible(true);application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}
}

接着是科学计算器的实现

package dazuoye;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class Kexue extends JFrame implements ActionListener {private final String[] KEYS = { "*", "/", "7", "8", "9","+", "4", "5", "6", "-", "1", "2", "3", "|x|","0",".","=", "1/x" };private final String[] COMMAND = { "Back", "C" };private JButton keys[] = new JButton[KEYS.length];private JButton commands[] = new JButton[COMMAND.length];private JTextField resultText = new JTextField("0");private boolean firstDigit = true;private double resultNum = 0.0;private String operator = "=";private boolean operateValidFlag = true;private final String[] KEYS2= {"X^2","X^3","X^Y","Sqrt","rt","X!","ln","lg","%","sin","cos","tan","PI","e","e^X"};private JButton keys2[]=new JButton[KEYS2.length];StringBuffer sb = new StringBuffer();String vl = null;private JPanel contentPane,contentpane2;private FlowLayout layout;public Kexue(){super("科学型");this.setBackground(Color.LIGHT_GRAY);this.setTitle("科学计算器");this.setSize(800, 500);JMenuBar menuBar = new JMenuBar();setJMenuBar(menuBar);JMenu menu = new JMenu("功能");menuBar.add(menu);JMenuItem menuItem = new JMenuItem("标准型");menu.add(menuItem);JMenuItem menuItem_1 = new JMenuItem("科学型");menu.add(menuItem_1);menuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {Biaozhun ordinary = new Biaozhun();ordinary.setVisible(true);}});resultText.setHorizontalAlignment(JTextField.RIGHT);resultText.setBackground(Color.white);resultText.setFont(new Font("TimesRoman",Font.BOLD,46));JPanel PPanel=new JPanel();PPanel.setLayout(new GridLayout(5, 4, 3, 3));for (int i = 0; i < COMMAND.length; i++) {commands[i] = new JButton(COMMAND[i]);PPanel.add(commands[i]);commands[i].setFont(new Font("Courir",Font.PLAIN,20));}for (int i = 0; i < KEYS.length; i++) {keys[i] = new JButton(KEYS[i]);PPanel.add(keys[i]);keys[i].setFont(new Font("Courir",Font.ITALIC,20));}JPanel panel1 = new JPanel();panel1.setLayout(new BorderLayout(3,3));panel1.add("Center", PPanel);JPanel top = new JPanel();top.setLayout(new BorderLayout());top.add("Center", resultText);contentPane=new JPanel();contentPane.setLayout(new BorderLayout(3, 5));contentPane.add("North", top);contentPane.add("Center", panel1);//secondJPanel ppanel=new JPanel();ppanel.setLayout(new GridLayout(5, 3, 3, 3));for (int i = 0; i < KEYS2.length; i++) {keys2[i] = new JButton(KEYS2[i]);ppanel.add(keys2[i]);keys2[i].setFont(new Font("Courir",Font.ITALIC,20));}contentpane2 = new JPanel();contentpane2.setLayout(new BorderLayout(3, 5));contentpane2.add("Center", ppanel);layout=new FlowLayout();JPanel ane= new JPanel();ane.setLayout(layout);getContentPane().setLayout(new BorderLayout(3,5));getContentPane().add("Center", contentPane);getContentPane().add("East", contentpane2);
//eventfor (int i = 0; i < KEYS.length; i++) {keys[i].addActionListener(this);}for (int i = 0; i < COMMAND.length; i++) {commands[i].addActionListener(this);}for (int i = 0; i < KEYS2.length; i++)keys2[i].addActionListener(this);setVisible(true);}
//make itpublic void actionPerformed(ActionEvent e){String label = e.getActionCommand();if (label.equals(COMMAND[0])) {handleBack();} else if (label.equals(COMMAND[1])) {handleC();} else if ("0123456789.".indexOf(label) >= 0) {handleNumber(label);}else if(label.equals("PI"))resultText.setText(String.valueOf(3.14159265));else if(label.equals("e"))resultText.setText(String.valueOf(2.17828));elsehandleOperator(label);}//private void handleBack() {String text = resultText.getText();int i = text.length();if (i > 0) {text = text.substring(0, i - 1);if (text.length() == 0) {resultText.setText("0");firstDigit = true;operator = "=";}elseresultText.setText(text);}}private void handleNumber(String key) {if (firstDigit) {resultText.setText(key);}else if ((key.equals(".")) && (resultText.getText().indexOf(".") < 0)) {resultText.setText(resultText.getText() + ".");}else if (!key.equals(".")) {resultText.setText(resultText.getText() + key);}firstDigit = false;}private void handleC() {resultText.setText("0");firstDigit = true;operator = "=";}private void handleOperator(String key) {if (operator.equals("/")) {if (getNumberFromText() == 0.0) {operateValidFlag = false;resultText.setText("除数不能为零");}else resultNum /= getNumberFromText();} else if (operator.equals("1/x")) {if (resultNum == 0.0) {operateValidFlag = false;resultText.setText("零没有倒数");}elseresultNum = 1 / resultNum;}else if (operator.equals("+")) {resultNum += getNumberFromText();}else if (operator.equals("-")) {resultNum -= getNumberFromText();}else if (operator.equals("*")) {resultNum *= getNumberFromText();}else if (operator.equals("|x|")) {resultNum = Math.abs(resultNum);}else if (operator.equals("X^2")) {resultNum = resultNum*resultNum;}else if (operator.equals("X^3")) {resultNum = resultNum*resultNum*resultNum;}else if (operator.equals("X^Y")) {resultNum = Math.pow(resultNum,getNumberFromText());}else if (operator.equals("Sqrt")) {resultNum = Math.sqrt(resultNum);}else if (operator.equals("rt")) {resultNum = resultNum*57.3;}else if (operator.equals("X!")) {int ee;double re=resultNum ;int c=1;for(ee=1;ee<=re;ee++){c=c*ee;resultNum=c;}}else if (operator.equals("ln")) {resultNum = Math.log(resultNum);}else if (operator.equals("lg")) {resultNum = Math.log10(resultNum);}else if (operator.equals("%")) {resultNum %= getNumberFromText();}else if (operator.equals("sin")) {resultNum = Math.sin(resultNum);}else if (operator.equals("cos")) {resultNum = Math.cos(resultNum);}else if (operator.equals("tan")) {resultNum = Math.tan(resultNum);}else if (operator.equals("e^X")) {resultNum = Math.exp(resultNum);}else if (operator.equals("=")) {resultNum = getNumberFromText();}if (operateValidFlag) {long t1;double t2;t1 = (long) resultNum;t2 = resultNum - t1;if (t2 == 0) {resultText.setText(String.valueOf(t1));}else {resultText.setText(String.valueOf(resultNum));}}operator = key;firstDigit = true;operateValidFlag = true;}private double getNumberFromText() {double result = 0;try {result = Double.valueOf(resultText.getText()).doubleValue();} catch (NumberFormatException e) {}return result;}public static void main(String args[]) {EventQueue.invokeLater(new Runnable() {public void run() {try {Kexue application = new Kexue();application.setVisible(true);} catch (Exception e) {e.printStackTrace();}}});}}

运行结果

结束

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Java---计算器（标准计算器，科学计算器）的实现

代码部分

运行结果

结束

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