基于Java计算器科学计算器与标准计算器相互转化

文件名：Calculator.java

package calculator;import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JSeparator;
import javax.swing.JTextField;
import javax.swing.WindowConstants;/*** * @author Fish·Potato·Chen**/@SuppressWarnings("serial")
public class Calculator extends JFrame {private Container container = this.getContentPane();// 创建容器private GridBagLayout gridBagLayout = new GridBagLayout();// 使用GirdBagLayout布局器private GridBagConstraints gridBagConstraints = new GridBagConstraints();private JTextField displayFielddown;// 创建科学计算器的输入栏private JTextField displayFieldup;// 创建科学计算器的展示栏private JTextField displayField;// 创建标准计算器的输入栏private JMenuBar bar;// 菜单栏private JMenu set1;// 菜单栏中的项private JMenu set2;// 菜单栏中的项private JMenuItem itemsfunction[];// 菜单栏下的功能选项private JMenuItem itemshelp[];// 菜单栏下的帮助选项private String lastCommand = "=";int order = 0;int mode = 1;// 1为标准计算器2为科学计算器double result = 0;double x;private boolean start = true;boolean down = true;boolean up = true;boolean indown = false;public Calculator() {super("计算器");setLocation(100, 100);getContentPane().setBackground(Color.DARK_GRAY);container.setLayout(gridBagLayout);createmenu();initDisplayArea();initButtons();initFrame(900, 900);}private void createmenu() {// 创建菜单栏bar = new JMenuBar();set1 = new JMenu("切换");set2 = new JMenu("帮助");// 在每个菜单选项下添加项itemsfunction = new JMenuItem[2];itemshelp = new JMenuItem[3];// 菜单项每项下加入选项itemsfunction[0] = new JMenuItem("标准计算器");itemsfunction[1] = new JMenuItem("科学计算器");itemshelp[0] = new JMenuItem("使用说明");itemshelp[1] = new JMenuItem("开发者");itemshelp[2] = new JMenuItem("警告");// 创建标准计算器itemsfunction[0].addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (mode != 1) {mode = 1;container.removeAll();initDisplayArea();initButtons();initFrame(900, 900);}}});// 创建科学计算器itemsfunction[1].addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (mode != 2) {mode = 2;container.removeAll();initDisplayAreaup(0, 0, 20);initDisplayAreadown(0, 1, 40);initButtons();initFrame(1000, 800);}}});// 创建使用说明itemshelp[0].addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {JOptionPane.showMessageDialog(null,"在科学计算器中，为了弥补x的y次方(x^y)与x开y次方(y√x)的的不足,我对两者使用方法进行了改进(以下将两者的按键统称\n为按键):\n\n        "+ "使用时先输入x(或一个等式并计算结果)之后点击按键,然后输入y(或另一个等式并计算结果),之后再次点击按键,便可得\n到值,该值"+ "还可以参与其他运算.\n\n例如:\n5^(6*5) : 先输入5，点击按钮，再输入6*5点击等于计算出结果，再次点击按钮得到结果.\n(15+2*3)√"+ "(8*7-2) : 先输入8*7-2,点击等于,计算结果,再点击按钮,之后输入15+2*3,点击等于，计算结果,最后点击按钮得到结果.","帮助", JOptionPane.PLAIN_MESSAGE);}});// 创建开发者信息itemshelp[1].addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {JOptionPane.showMessageDialog(null, "作者:Fish·Potato·Chen\nQQ:2411016277\n邮箱：Fishcqy@163.com", "开发者",JOptionPane.PLAIN_MESSAGE);}});// 创建警告itemshelp[2].addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {JOptionPane.showMessageDialog(null, "如果计算器按动任何按键都无反应,点击清除(C)按键.", "警告", JOptionPane.PLAIN_MESSAGE);}});// 将创建的选项加入到各自的菜单栏下for (int i = 0; i < 2; i++) {set1.add(itemsfunction[i]);set1.add(new JSeparator());}for (int i = 0; i < 3; i++) {set2.add(itemshelp[i]);set2.add(new JSeparator());}bar.add(set1);bar.add(set2);Calculator.this.setJMenuBar(bar);}// 设置弹窗位置private void initFrame(int x, int y) {setSize(x, y);setVisible(true);setResizable(true);setForeground(Color.black);setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}// 增加按钮private void initButtons() {// 标准计算器下的按钮if (mode == 1) {ActionListener insert = new Calculator.InsertAction();ActionListener command = new Calculator.CommandAction();addButton("←", 0, 1, 2, 1, insert, Color.DARK_GRAY);addButton("C", 2, 1, 1, 1, insert, Color.DARK_GRAY);addButton("7", 0, 2, 1, 1, insert, Color.BLACK);addButton("8", 1, 2, 1, 1, insert, Color.BLACK);addButton("9", 2, 2, 1, 1, insert, Color.BLACK);addButton("+", 3, 1, 1, 1, command, Color.DARK_GRAY);addButton("4", 0, 3, 1, 1, insert, Color.BLACK);addButton("5", 1, 3, 1, 1, insert, Color.BLACK);addButton("6", 2, 3, 1, 1, insert, Color.BLACK);addButton("-", 3, 2, 1, 1, command, Color.DARK_GRAY);addButton("1", 0, 4, 1, 1, insert, Color.BLACK);addButton("2", 1, 4, 1, 1, insert, Color.BLACK);addButton("3", 2, 4, 1, 1, insert, Color.BLACK);addButton("*", 3, 3, 1, 1, command, Color.DARK_GRAY);addButton("±", 0, 5, 1, 1, insert, Color.DARK_GRAY);addButton("0", 1, 5, 1, 1, insert, Color.BLACK);addButton(".", 2, 5, 1, 1, insert, Color.DARK_GRAY);addButton("/", 3, 4, 1, 1, command, Color.DARK_GRAY);addButton("=", 3, 5, 1, 1, command, Color.DARK_GRAY);}// 科学计算器下的按钮else if (mode == 2) {ActionListener command1 = new Calculator.Command1Action();ActionListener command2 = new Calculator.Command2Action();ActionListener command3 = new Calculator.Command3Action();ActionListener command4 = new Calculator.Command4Action();ActionListener command5 = new Calculator.Command5Action();ActionListener command6 = new Calculator.Command6Action();ActionListener command7 = new Calculator.Command7Action();addButton("√x", 0, 2, 1, 1, command1, Color.DARK_GRAY);addButton("x^y", 1, 2, 1, 1, command3, Color.DARK_GRAY);addButton("y√x", 2, 2, 1, 1, command3, Color.DARK_GRAY);addButton("x^2", 3, 2, 1, 1, command1, Color.DARK_GRAY);addButton("CE", 4, 2, 1, 1, command7, Color.DARK_GRAY);addButton("C", 5, 2, 1, 1, command7, Color.DARK_GRAY);addButton("←", 6, 2, 1, 1, command7, Color.DARK_GRAY);addButton("+", 7, 2, 1, 1, command6, Color.DARK_GRAY);addButton("10^x", 0, 3, 1, 1, command1, Color.DARK_GRAY);addButton("ln", 1, 3, 1, 1, command1, Color.DARK_GRAY);addButton("sin", 2, 3, 1, 1, command1, Color.DARK_GRAY);addButton("arcsin", 3, 3, 1, 1, command1, Color.DARK_GRAY);addButton("7", 4, 3, 1, 1, command5, Color.BLACK);addButton("8", 5, 3, 1, 1, command5, Color.BLACK);addButton("9", 6, 3, 1, 1, command5, Color.BLACK);addButton("-", 7, 3, 1, 1, command6, Color.DARK_GRAY);addButton("e^x", 0, 4, 1, 1, command1, Color.DARK_GRAY);addButton("e", 1, 4, 1, 1, command2, Color.DARK_GRAY);addButton("cos", 2, 4, 1, 1, command1, Color.DARK_GRAY);addButton("arccos", 3, 4, 1, 1, command1, Color.DARK_GRAY);addButton("4", 4, 4, 1, 1, command5, Color.BLACK);addButton("5", 5, 4, 1, 1, command5, Color.BLACK);addButton("6", 6, 4, 1, 1, command5, Color.BLACK);addButton("*", 7, 4, 1, 1, command6, Color.DARK_GRAY);addButton("n!", 0, 5, 1, 1, command1, Color.DARK_GRAY);addButton("π", 1, 5, 1, 1, command2, Color.DARK_GRAY);addButton("tan", 2, 5, 1, 1, command1, Color.DARK_GRAY);addButton("arctan", 3, 5, 1, 1, command1, Color.DARK_GRAY);addButton("1", 4, 5, 1, 1, command5, Color.BLACK);addButton("2", 5, 5, 1, 1, command5, Color.BLACK);addButton("3", 6, 5, 1, 1, command5, Color.BLACK);addButton("/", 7, 5, 1, 1, command6, Color.DARK_GRAY);addButton("(", 0, 6, 1, 1, command4, Color.DARK_GRAY);addButton(")", 1, 6, 1, 1, command4, Color.DARK_GRAY);addButton("%", 2, 6, 1, 1, command1, Color.DARK_GRAY);addButton("Ans", 3, 6, 1, 1, command2, Color.DARK_GRAY);addButton("±", 4, 6, 1, 1, command1, Color.DARK_GRAY);addButton("0", 5, 6, 1, 1, command5, Color.BLACK);addButton(".", 6, 6, 1, 1, command6, Color.DARK_GRAY);addButton("=", 7, 6, 1, 1, command6, Color.DARK_GRAY);}}/*** 科学计算器上展示栏* * @param x为布局器中左上角横坐标* @param y为布局器中左上角纵坐标* @param z为字体大小*/private void initDisplayAreaup(int x, int y, int z) {// 大小displayFieldup = new JTextField(20);displayFieldup.setHorizontalAlignment(4);// 颜色displayFieldup.setBackground(Color.DARK_GRAY);displayFieldup.setDisabledTextColor(Color.WHITE);// 不可键盘输入displayFieldup.setEnabled(false);// 字体displayFieldup.setFont(new Font("微软雅黑", Font.BOLD, z));// 布局器中位置与大小gridBagConstraints.gridx = x;gridBagConstraints.gridy = y;gridBagConstraints.gridwidth = 8;gridBagConstraints.gridheight = 1;gridBagConstraints.fill = 1;gridBagConstraints.weightx = 1;gridBagConstraints.weighty = 1;gridBagLayout.setConstraints(displayFieldup, gridBagConstraints);container.add(displayFieldup);}/*** 科学计算器的下展示栏* * @param x为布局器中左上角横坐标* @param y为布局器中左上角纵坐标* @param z为字体大小*/private void initDisplayAreadown(int x, int y, int z) {// 大小displayFielddown = new JTextField(20);displayFielddown.setHorizontalAlignment(4);// 颜色displayFielddown.setBackground(Color.DARK_GRAY);displayFielddown.setDisabledTextColor(Color.WHITE);// 不可键盘输入displayFielddown.setEnabled(false);// 字体displayFielddown.setFont(new Font("微软雅黑", Font.BOLD, z));// 布局器中位置与大小gridBagConstraints.gridx = x;gridBagConstraints.gridy = y;gridBagConstraints.gridwidth = 8;gridBagConstraints.gridheight = 1;gridBagConstraints.fill = 1;gridBagConstraints.weightx = 1;gridBagConstraints.weighty = 1;gridBagLayout.setConstraints(displayFielddown, gridBagConstraints);container.add(displayFielddown);Calculator.this.displayFielddown.setText("0");}/*** 标准计算器的展示栏*/private void initDisplayArea() {// 大小displayField = new JTextField(20);displayField.setHorizontalAlignment(4);// 颜色displayField.setBackground(Color.DARK_GRAY);displayField.setDisabledTextColor(Color.WHITE);// 不可键盘输入displayField.setEnabled(false);// 字体displayField.setFont(new Font("微软雅黑", Font.BOLD, 50));// 布局器中位置与大小gridBagConstraints.gridx = 0;gridBagConstraints.gridy = 0;gridBagConstraints.gridwidth = 4;gridBagConstraints.gridheight = 1;gridBagConstraints.fill = 1;gridBagConstraints.weightx = 1;gridBagConstraints.weighty = 1;gridBagLayout.setConstraints(displayField, gridBagConstraints);container.add(displayField);}/*** * @param label    标签* @param column   布局器中左上角位置* @param row      布局器中左上角位置* @param with     宽* @param height   高* @param listener 监听鼠标点击* @param color    颜色*/private void addButton(String label, int column, int row, int with, int height, ActionListener listener,Color color) {// 增加标签JButton button = new JButton(label);// 颜色button.setForeground(Color.WHITE);button.setBackground(color);// 标准计算器if (mode == 1)button.setFont(new Font("楷体", Font.BOLD, 36));// 科学计算器else if (mode == 2)button.setFont(new Font("楷体", Font.BOLD, 27));// 增加监听button.addActionListener(listener);// 去掉标签焦点框button.setFocusPainted(false);// 位置与大小gridBagConstraints.gridx = column;gridBagConstraints.gridy = row;gridBagConstraints.gridwidth = with;gridBagConstraints.gridheight = height;gridBagConstraints.fill = GridBagConstraints.BOTH;gridBagConstraints.insets = new Insets(1, 1, 1, 1);gridBagLayout.setConstraints(button, gridBagConstraints);container.add(button);}/*** * @param x 传入x与结果做加减乘除与百分*/public void calculate(double x) {if (this.lastCommand.equals("+")) {this.result += x;} else if (this.lastCommand.equals("-")) {this.result -= x;} else if (this.lastCommand.equals("*")) {this.result *= x;} else if (this.lastCommand.equals("/")) {this.result /= x;} else if (this.lastCommand.equals("=")) {this.result = x;} else if (this.lastCommand.equals("%")) {this.result /= 100;}this.displayField.setText("" + this.result);}/*** 使用类中类 读取按键* * @author Fish·Potato·Chen**/private class CommandAction implements ActionListener {public void actionPerformed(ActionEvent evt) {String command = evt.getActionCommand();if (Calculator.this.start) {Calculator.this.lastCommand = command;} else {Calculator.this.calculate(Double.parseDouble(Calculator.this.displayField.getText()));Calculator.this.lastCommand = command;Calculator.this.start = true;}}}/*** 使用类中类 读取按键* * @author Fish·Potato·Chen**/private class InsertAction implements ActionListener {public void actionPerformed(ActionEvent event) {String input = event.getActionCommand();if (Calculator.this.start) {Calculator.this.displayField.setText("");Calculator.this.start = false;if (input.equals("±"))Calculator.this.displayField.setText(Calculator.this.displayField.getText() + "-");}if (!input.equals("±")) {if (input.equals("←")) {String str = Calculator.this.displayField.getText();if (str.length() > 1)Calculator.this.displayField.setText(str.substring(0, str.length() - 1));else {Calculator.this.displayField.setText("0");Calculator.this.start = true;}} else if (input.equals("C")) {Calculator.this.displayField.setText("0");result = 0.0d;Calculator.this.start = true;} else {if (input.equals(".")) {if (Calculator.this.displayField.getText().trim().indexOf(".") == -1)Calculator.this.displayField.setText(Calculator.this.displayField.getText() + input);} elseCalculator.this.displayField.setText(Calculator.this.displayField.getText() + input);}}}}private class Command1Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command = evt.getActionCommand();if (command.equals("√x"))Calculator.this.displayFielddown.setText(String.valueOf(Math.sqrt(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("x^2"))Calculator.this.displayFielddown.setText(String.valueOf(Math.pow(Double.parseDouble(Calculator.this.displayFielddown.getText()), 2)));else if (command.equals("10^x"))Calculator.this.displayFielddown.setText(String.valueOf(Math.pow(10, Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("ln"))Calculator.this.displayFielddown.setText(String.valueOf(Math.log(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("sin"))Calculator.this.displayFielddown.setText(String.valueOf(Math.sin(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("arcsin"))Calculator.this.displayFielddown.setText(String.valueOf(Math.asin(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("e^x"))Calculator.this.displayFielddown.setText(String.valueOf(Math.pow(Math.E, Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("cos"))Calculator.this.displayFielddown.setText(String.valueOf(Math.cos(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("arccos"))Calculator.this.displayFielddown.setText(String.valueOf(Math.acos(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("n!"))Calculator.this.displayFielddown.setText(String.valueOf(Calculator.this.factorial((int) Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("tan"))Calculator.this.displayFielddown.setText(String.valueOf(Math.tan(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("arctan"))Calculator.this.displayFielddown.setText(String.valueOf(Math.atan(Double.parseDouble(Calculator.this.displayFielddown.getText()))));else if (command.equals("%"))Calculator.this.displayFielddown.setText(String.valueOf(Double.parseDouble(Calculator.this.displayFielddown.getText()) / 100));down = false;indown = false;if (command.equals("±"))if (Double.parseDouble(Calculator.this.displayFielddown.getText()) != 0) {Calculator.this.displayFielddown.setText(String.valueOf(-1 * (Double.parseDouble(Calculator.this.displayFielddown.getText()))));} else {down = true;indown = true;}}}private class Command2Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command2 = evt.getActionCommand();if (command2.equals("e"))Calculator.this.displayFielddown.setText(String.valueOf(Math.E));else if (command2.equals("π"))Calculator.this.displayFielddown.setText(String.valueOf(Math.PI));else if (command2.equals("Ans"))Calculator.this.displayFielddown.setText(String.valueOf(Calculator.this.result));down = false;}}private class Command3Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command3 = evt.getActionCommand();if (order == 1) {Calculator.this.displayFielddown.setText(String.valueOf(Math.pow(x, Double.parseDouble(Calculator.this.displayFielddown.getText()))));order = 0;} else if (order == 2) {Calculator.this.displayFielddown.setText(String.valueOf(Math.pow(x, 1 / Double.parseDouble(Calculator.this.displayFielddown.getText()))));order = 0;} else {x = Double.parseDouble(Calculator.this.displayFielddown.getText());Calculator.this.displayFielddown.setText("0");indown = false;down = true;if (command3.equals("x^y"))order = 1;else if (command3.contentEquals("y√x"))order = 2;}}}private class Command4Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command4 = evt.getActionCommand();if (command4.equals("(")) {Calculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText() + "(");Calculator.this.displayFielddown.setText("0");} else if (command4.equals(")"))if (down) {Calculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText() + ")");Calculator.this.displayFielddown.setText("0");} else {Calculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText()+ Calculator.this.displayFielddown.getText() + ")");Calculator.this.displayFielddown.setText("");}down = true;}}private class Command5Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command5 = evt.getActionCommand();if (down && !command5.contentEquals("0")) {Calculator.this.displayFielddown.setText(command5);down = false;indown = true;} else if (indown)Calculator.this.displayFielddown.setText(Calculator.this.displayFielddown.getText() + command5);}}private class Command6Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command6 = evt.getActionCommand();if (command6.equals(".")) {if (Calculator.this.displayFielddown.getText().trim().indexOf(".") == -1)Calculator.this.displayFielddown.setText(Calculator.this.displayFielddown.getText() + command6);} else if (command6.equals("=")) {Calculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText() + Calculator.this.displayFielddown.getText());if (!Calculator.this.displayFieldup.getText().equals("")) {try {Calculator.this.result = (double) new ScriptEngineManager().getEngineByName("js").eval(Calculator.this.displayFieldup.getText() + "*1.0");// 上面这一行用不了就用下面的// Calculator.this.result = Double.parseDouble(String.valueOf(new// ScriptEngineManager().getEngineByName("js").eval(Calculator.this.displayFieldup.getText()// + "*1.0")));Calculator.this.displayFielddown.setText(String.valueOf(Calculator.this.result));} catch (ScriptException e) {Calculator.this.displayFielddown.setText("error");e.printStackTrace();}} else {Calculator.this.result = 0;Calculator.this.displayFielddown.setText(String.valueOf(Calculator.this.result));}Calculator.this.displayFieldup.setText("");down = true;indown = false;} else {if (Calculator.this.displayFielddown.getText().equals(""))Calculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText() + command6);elseCalculator.this.displayFieldup.setText(Calculator.this.displayFieldup.getText()+ String.valueOf(Double.parseDouble(Calculator.this.displayFielddown.getText()))+ command6);Calculator.this.displayFielddown.setText("0");down = true;}}}private class Command7Action implements ActionListener {public void actionPerformed(ActionEvent evt) {String command7 = evt.getActionCommand();if (command7.equals("CE")) {Calculator.this.displayFielddown.setText("0");down = true;indown = false;} else if (command7.equals("C")) {Calculator.this.displayFielddown.setText("0");Calculator.this.displayFieldup.setText("");indown = false;down = true;} else {if (!indown) {Calculator.this.displayFielddown.setText("0");down = true;} else {String str = Calculator.this.displayFielddown.getText();if (str.length() > 1)Calculator.this.displayFielddown.setText(str.substring(0, str.length() - 1));else {Calculator.this.displayFielddown.setText("0");down = true;indown = false;}}}}}private int factorial(int n) {int m = n;if (n == 0)return 1;else if (n < 0) {n = Math.abs(n);for (int i = 1; i < n; i++)m *= i;return -1 * n;} elsefor (int i = 1; i < n; i++)m *= i;return m;}public static void main(String[] args) {new Calculator();}
}

其实GUI就是不断重复编写按键，所以GUI没有什么好说的（可能有读者过来就是为了看GUI，建议拷贝到机子上跑一下就明白了），后面的那些计算判断，就是硬判断，用最笨的方法进行求解。其实可以直接使用逆波兰表达式进行求解，我将在下一篇中用C++进行介绍。

BUG说明：
1.在科学计算器中无法输入0.几
2.在科学计算器中可以输入00.

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