| 标题 | 记事本写的科学计算器(源代码) |
| 关键字 | 记事本写的科学计算器(源代码) |
| 出处 | 选择自 hongweijin 的 Blog 作者Blog：http://blog.csdn.net/hongweijin/ |
/**
* Calculator * A shareware calculator * * @author {@link http://blog.csdn.net/hongweijin Bingbing Li} * * @recitation 0101 Matt Carlson * * @date 12/7/2005 12:08AM *
*/
import javax.swing.*; import javax.swing.border.*; import java.awt.*; import java.awt.event.*; public class Calculator extends JFrame implements ActionListener {
public static final int WIDTH = 800; // width of the window public static final int HEIGHT = 600; // height of the window public static final int BUTTON_WIDTH = 80; // width of the buttons public static final int BUTTON_HEIGHT = 60; // height of the buttons private CardLayout dealer; // card layout private JPanel deckPanel; // used to card layout private JTextField result; // the calculate result private JCheckBoxMenuItem scientificMode; // the menu item of the mode private Box vPanel1; // the first line buttons of the // scientific mode. private JButton mod; // the modular button private JButton xey; // the button of Yth root of X private JButton ms; // save button private JButton mr; // release the stored value private JButton mc; // clear the stored value private double head = 0.0; // the first number of the equation private double tail = 0.0; // the second number of the equation private boolean substitution = true; // whether substituted the answer or not private String operatedCommand = "NOTHING"; // the current operated command private String preOperatedCommand = "NOTHING"; // remember the pre-operated command private double variableMemory = 0.0; // the variable of the memory private JButton jButtonR; // the register's button private JButton jButtonE; // the edit's button private JTextField nameField; // the field of the name private JTextField countryField; // the field of the country private JTextField zipField; // the field of the zip private JTextField stateField; // the field of the state private JTextField cityField ; // the field of the city private JTextField streetAddressField; // the field of the address private JTextField first; // the first part of the key private JTextField second; // the second part of the key private JTextField third; // the third part of the key private JTextField fourth; // the fourth part of the key public Calculator()
{
setSize(WIDTH, HEIGHT); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setTitle("Normal Calculator"); Container contentPre = getContentPane(); // the container of the window dealer = new CardLayout(); // create a new card layout deckPanel = new JPanel(); deckPanel.setLayout(dealer); Box content = Box.createVerticalBox(); // create a new vertical Box Box registration = Box.createVerticalBox(); /**************************************************** * menu * file
*****************************************************/ JMenu fileMenu = new JMenu("File"); JMenuItem exitItemOfFile = new JMenuItem("Exit"); exitItemOfFile.addActionListener(this); fileMenu.add(exitItemOfFile); /** * menu * settings */ JMenu settingsMenu = new JMenu("Settings"); JMenuItem registrationInfo = new JMenuItem("Registration Info"); registrationInfo.addActionListener(this); settingsMenu.add(registrationInfo); scientificMode = new JCheckBoxMenuItem("Scientific Mode"); scientificMode.addActionListener(this); settingsMenu.add(scientificMode); JMenuBar jMenuBar = new JMenuBar(); jMenuBar.add(fileMenu); jMenuBar.add(settingsMenu); setJMenuBar(jMenuBar); /**************************************************** * textFiled panel *****************************************************/ result = new JTextField("0"); // the initiated value of the answer result.setBackground(Color.CYAN); // set the back ground color with cyan result.setHorizontalAlignment(JTextField.RIGHT); // set the horizontal alignment content.add(result); content.add(paintButtons()); deckPanel.add("cal", content); // add the calculators card to the layout registration.add(paintRegistration()); // add the register window deckPanel.add("reg", registration); // add the register window to the layout contentPre.add(deckPanel); // add the cards to the container } /** * paint the buttons of the two models. * */ public Box paintButtons() { /**************************************************** * Buttons *****************************************************/ /** * line1 */ vPanel1 = Box.createVerticalBox(); // add the backwards's button JButton backwards = new JButton("1/X"); backwards.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); backwards.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); backwards.addActionListener(this); vPanel1.add(backwards); // add the factorial button JButton factorial = new JButton("X!"); factorial.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); factorial.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); factorial.addActionListener(this); vPanel1.add(factorial); // add the square's button JButton square = new JButton("<html>X<sup>2</sup></html>"); square.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); square.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); square.addActionListener(this); square.setActionCommand("sqr"); vPanel1.add(square); // add the square root's button JButton squareRoot = new JButton("\u221a"); squareRoot.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); squareRoot.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); squareRoot.addActionListener(this); vPanel1.add(squareRoot); // add the power's button JButton power = new JButton("<html>X<sup>Y</sup></html>"); power.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); power.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); power.addActionListener(this); power.setActionCommand("pow"); vPanel1.add(power); /** * line2 */ Box vPanel2 = Box.createVerticalBox(); // add the modular button mod = new JButton("Mod"); mod.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mod.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mod.addActionListener(this); vPanel2.add(mod); // add the seven button JButton seven = new JButton("7"); seven.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); seven.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); seven.addActionListener(this); vPanel2.add(seven); // add the four button JButton four = new JButton("4"); four.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); four.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); four.addActionListener(this); vPanel2.add(four); // add the one button JButton one = new JButton("1"); one.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); one.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); one.addActionListener(this); vPanel2.add(one); // add the zero button JButton zero = new JButton("0"); zero.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); zero.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); zero.addActionListener(this); vPanel2.add(zero); /** * line3 */ Box vPanel3 = Box.createVerticalBox(); // add the Yth root of X button xey = new JButton("XeY"); xey.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); xey.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); xey.addActionListener(this); vPanel3.add(xey); // add the eight button JButton eight = new JButton("8"); eight.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); eight.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); eight.addActionListener(this); vPanel3.add(eight); // add the five button JButton five = new JButton("5"); five.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); five.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); five.addActionListener(this); vPanel3.add(five); // add the two button JButton two = new JButton("2"); two.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); two.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); two.addActionListener(this); vPanel3.add(two); // add the dot button JButton dot = new JButton("."); dot.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); dot.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); dot.addActionListener(this); vPanel3.add(dot); /** * line4 */ Box vPanel4 = Box.createVerticalBox(); // add the MS button ms = new JButton("MS"); ms.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); ms.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); ms.addActionListener(this); vPanel4.add(ms); // add the nine button JButton nine = new JButton("9"); nine.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); nine.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); nine.addActionListener(this); vPanel4.add(nine); // add the six button JButton six = new JButton("6"); six.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); six.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); six.addActionListener(this); vPanel4.add(six); // add the three button JButton three = new JButton("3"); three.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); three.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); three.addActionListener(this); vPanel4.add(three); // add the plusMinus button JButton plusMinus = new JButton("\u00b1"); plusMinus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); plusMinus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); plusMinus.addActionListener(this); vPanel4.add(plusMinus); /** * line5 */ Box vPanel5 = Box.createVerticalBox(); // add the MR button mr = new JButton("MR"); mr.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mr.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mr.addActionListener(this); vPanel5.add(mr); // add the division button JButton division = new JButton("\u00F7"); division.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); division.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); division.addActionListener(this); vPanel5.add(division); // add the multiplication button JButton multiplication = new JButton("\u00d7"); multiplication.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); multiplication.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); multiplication.addActionListener(this); vPanel5.add(multiplication); // add the subtract button JButton subtract = new JButton("-"); subtract.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); subtract.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); subtract.addActionListener(this); vPanel5.add(subtract); // add the plus button JButton plus = new JButton("+"); plus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); plus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); plus.addActionListener(this); vPanel5.add(plus); /** * line6 */ Box vPanel6 = Box.createVerticalBox(); // add the MC button mc = new JButton("MC"); mc.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mc.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); mc.addActionListener(this); vPanel6.add(mc); // add the C button JButton c = new JButton("C"); c.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); c.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT)); c.addActionListener(this); vPanel6.add(c); // add a vertical strut Component verticalStrut = Box.createVerticalStrut(BUTTON_HEIGHT); vPanel6.add(verticalStrut); // add the enter button JButton enter = new JButton("="); enter.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2)); enter.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2)); enter.addActionListener(this); vPanel6.add(enter); /** * Buttons panel */ Box buttonsPanel = Box.createHorizontalBox(); buttonsPanel.add(vPanel1); buttonsPanel.add(vPanel2); buttonsPanel.add(vPanel3); buttonsPanel.add(vPanel4); buttonsPanel.add(vPanel5); buttonsPanel.add(vPanel6); /********************************************************** * the initial state is normal calculator ***********************************************************/ vPanel1.setVisible(false); mod.setVisible(false); xey.setVisible(false); ms.setVisible(false); mr.setVisible(false); mc.setVisible(false); return buttonsPanel; } /** * paint the registration window. * */ public Box paintRegistration() { Box registration = Box.createVerticalBox(); /* * title */ JLabel titleRegistration = new JLabel("Bingbing's Calculator Registration"); registration.add(titleRegistration); /* * information */ JPanel information = new JPanel(); information.setLayout(new GridLayout(6, 2)); //Name JLabel name = new JLabel("Name:"); nameField = new JTextField(); information.add(name); information.add(nameField); //Street Address JLabel streetAddress = new JLabel("Street Address:"); streetAddressField = new JTextField(); information.add(streetAddress); information.add(streetAddressField); //City JLabel city = new JLabel("City:"); cityField = new JTextField(); information.add(city); information.add(cityField); //State JLabel state = new JLabel("State:"); stateField = new JTextField(); information.add(state); information.add(stateField); //Zip JLabel zip = new JLabel("Zip:"); zipField = new JTextField(); information.add(zip); information.add(zipField); //Country JLabel country = new JLabel("Country:"); countryField = new JTextField(); information.add(country); information.add(countryField); registration.add(information); /* * Registration Code */ Box registrationCode = Box.createVerticalBox(); JPanel registrationCodePanel = new JPanel(); registrationCodePanel.setLayout(new FlowLayout()); //registrationCodePanel.setTitle("Registration Code"); registrationCodePanel.setBorder(new LineBorder(Color.red, 1)); registrationCode.add(registrationCodePanel); first = new JTextField(3); registrationCodePanel.add(first); JLabel rail1 = new JLabel(" - "); registrationCodePanel.add(rail1); second = new JTextField(3); registrationCodePanel.add(second); JLabel rail2 = new JLabel(" - "); registrationCodePanel.add(rail2); third = new JTextField(3); JLabel rail3 = new JLabel(" - "); registrationCodePanel.add(third); registrationCodePanel.add(rail3); fourth = new JTextField(3); registrationCodePanel.add(fourth); /* * buttons */ JPanel buttonsReg = new JPanel(); buttonsReg.setLayout(new FlowLayout()); jButtonR = new JButton("Register"); jButtonE = new JButton("Edit"); JButton jButtonRe = new JButton("Return"); jButtonR.addActionListener(this); jButtonE.addActionListener(this); jButtonRe.addActionListener(this); buttonsReg.add(jButtonR); buttonsReg.add(jButtonE); buttonsReg.add(jButtonRe); registrationCode.add(buttonsReg); Box registrationAndPic = Box.createHorizontalBox(); registrationAndPic.add(registrationCode); jButtonE.setVisible(false); /* * image */ JLabel imageLabel = new JLabel(); ImageIcon greatwall = new ImageIcon("greatwall.jpg"); imageLabel.setIcon(greatwall); registrationAndPic.add(imageLabel); registration.add(registrationAndPic); return registration; } /** * performe the action which sent by the window. * * @param e catch the action event of the window. */ public void actionPerformed(ActionEvent e) { String actionCommand = e.getActionCommand(); // exit the system if(actionCommand.equals("Exit")) System.exit(0); // return to the calculator else if(actionCommand.equals("Return")) { dealer.show(deckPanel, "cal"); setTitle("Calculator"); validate(); pack(); } // check the register information else if(actionCommand.equals("Register")) { long check = 0; Boolean valid = true; if(nameField.getText().trim().length() != 0) { check = calChecksum(nameField.getText().trim()); if(check % 3 != Long.parseLong(first.getText().trim())) valid = false; else if(check% 5 != Long.parseLong(second.getText().trim())) valid = false; else if(check % 7 != Long.parseLong(third.getText().trim())) valid = false; else if(check % 11 != Long.parseLong(fourth.getText().trim())) valid = false; // if the information is valid, we will change the buttons // and set the text field uneditable. if(valid) { jButtonE.setVisible(true); jButtonR.setVisible(false); nameField.setEditable(false); countryField.setEditable(false); zipField.setEditable(false); stateField.setEditable(false); cityField.setEditable(false); streetAddressField.setEditable(false); first.setEditable(false); second.setEditable(false); third.setEditable(false); fourth.setEditable(false); validate(); } } } // make the text field editable else if(actionCommand.equals("Edit")) { jButtonE.setVisible(false); jButtonR.setVisible(true); nameField.setEditable(true); countryField.setEditable(true); zipField.setEditable(true); stateField.setEditable(true); cityField.setEditable(true); streetAddressField.setEditable(true); first.setEditable(true); second.setEditable(true); third.setEditable(true); fourth.setEditable(true); validate(); } // turn to registration window else if(actionCommand.equals("Registration Info")) { dealer.show(deckPanel, "reg"); setTitle("Registration"); validate(); pack(); } // turn to scientific model else if(actionCommand.equals("Scientific Mode")) { dealer.show(deckPanel, "cal"); vPanel1.setVisible(scientificMode.isSelected()); mod.setVisible(scientificMode.isSelected()); xey.setVisible(scientificMode.isSelected()); ms.setVisible(scientificMode.isSelected()); mr.setVisible(scientificMode.isSelected()); mc.setVisible(scientificMode.isSelected()); if(scientificMode.isSelected()) setTitle("Scientific Model"); else setTitle("Normal Model"); validate(); pack(); } // post the result else if(actionCommand.equals("=")) { // if the pre-operated command was "=", return the pre-step if(!preOperatedCommand.equals("=")) tail = Double.parseDouble(result.getText().trim()); // if the two numbel are 0, we don't need calculate the result if(tail!= 0.0 || head !=0.0) { // division if(operatedCommand.equals("\u00F7")) { if(Math.abs(tail) > 0.0000000000000000001) { head = head/tail; result.setText(Double.toString(head)); } else { JOptionPane.showMessageDialog(this, "Cannot divide by zero."); head = 0.0; tail = 0.0; } substitution = true; } // multiplacation else if(operatedCommand.equals("\u00d7")) { head = head*tail; result.setText(Double.toString(head)); substitution = true; } // sub else if(operatedCommand.equals("-")) { head = head-tail; result.setText(Double.toString(head)); substitution = true; } // plus else if(operatedCommand.equals("+")) { head = head+tail; result.setText(Double.toString(head)); substitution = true; } // pow else if(operatedCommand.equals("pow")) { head = Math.pow(head, tail); result.setText(Double.toString(head)); substitution = true; } // the Yth root of the X else if(operatedCommand.equals("XeY")) { head = Math.pow(head, 1/tail); result.setText(Double.toString(head)); substitution = true; } // modular else if(operatedCommand.equals("Mod")) { head = head % tail; result.setText(Double.toString(head)); substitution = true; } } preOperatedCommand = "="; } /************************************************************* * set the action of the number **************************************************************/ else if(actionCommand.equals("0")) { if(!(result.getText().equals("0") || result.getText().equals("-0"))) { if(substitution) { result.setText("0"); } else result.setText(result.getText() + "0"); } } else if(actionCommand.equals("1")) { if(substitution) { result.setText("1"); substitution = false; } else result.setText(result.getText() + "1"); } else if(actionCommand.equals("2")) { if(substitution) { result.setText("2"); substitution = false; } else result.setText(result.getText() + "2"); } else if(actionCommand.equals("3")) { if(substitution) { result.setText("3"); substitution = false; } else result.setText(result.getText() + "3"); } else if(actionCommand.equals("4")) { if(substitution) { result.setText("4"); substitution = false; } else result.setText(result.getText() + "4"); } else if(actionCommand.equals("5")) { if(substitution) { result.setText("5"); substitution = false; } else result.setText(result.getText() + "5"); } else if(actionCommand.equals("6")) { if(substitution) { result.setText("6"); substitution = false; } else result.setText(result.getText() + "6"); } else if(actionCommand.equals("7")) { if(substitution) { result.setText("7"); substitution = false; } else result.setText(result.getText() + "7"); } else if(actionCommand.equals("8")) { if(substitution) { result.setText("8"); substitution = false; } else result.setText(result.getText() + "8"); } else if(actionCommand.equals("9")) { if(substitution) { result.setText("9"); substitution = false; } else result.setText(result.getText() + "9"); } else if(actionCommand.equals(".")) { if(result.getText().length() == 0) result.setText("0."); if(!(result.getText().contains("."))) result.setText(result.getText() + "."); } else if(actionCommand.equals("\u00b1")) { if(result.getText().charAt(0) != '-') result.setText("-" + result.getText()); else result.setText(result.getText().substring(1)); } else if(actionCommand.equals("C")) { result.setText("0"); substitution = true; } /************************************************************* * set the action of the arithmetic **************************************************************/ // division else if(actionCommand.equals("\u00F7")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "\u00F7"; substitution = true; preOperatedCommand = "\u00F7"; } // multiplication else if(actionCommand.equals("\u00d7")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "\u00d7"; substitution = true; preOperatedCommand = "\u00d7"; } // sub else if(actionCommand.equals("-")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "-"; substitution = true; preOperatedCommand = "-"; } // plus else if(actionCommand.equals("+")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "+"; substitution = true; preOperatedCommand = "+"; } // backwards else if(actionCommand.equals("1/X")) { head = Double.parseDouble(result.getText().trim()); if(head != 0) result.setText(Double.toString(1/head)); else { JOptionPane.showMessageDialog(this, "Cannot divide by zero."); head = 0.0; tail = 0.0; } } // factorial else if(actionCommand.equals("X!")) { head = Double.parseDouble(result.getText().trim()); result.setText(Double.toString(factorial(head))); } // square else if(actionCommand.equals("sqr")) { head = Double.parseDouble(result.getText().trim()); result.setText(Double.toString(head*head)); } // square root else if(actionCommand.equals("\u221a")) { head = Double.parseDouble(result.getText().trim()); if(head >= 0.0) result.setText(Double.toString(Math.sqrt(head))); else { JOptionPane.showMessageDialog(this, "Invalid input for function"); head = 0.0; tail = 0.0; } } // power else if(actionCommand.equals("pow")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "pow"; substitution = true; preOperatedCommand = "pow"; } // the Yth of the X else if(actionCommand.equals("XeY")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "XeY"; substitution = true; preOperatedCommand = "XeY"; } // modular else if(actionCommand.equals("Mod")) { head = Double.parseDouble(result.getText().trim()); operatedCommand = "Mod"; substitution = true; preOperatedCommand = "Mod"; } // MS else if(actionCommand.equals("MS")) { variableMemory = Double.parseDouble(result.getText().trim()); } // MR else if(actionCommand.equals("MR")) { result.setText(Double.toString(variableMemory)); } // MC else if(actionCommand.equals("MC")) { variableMemory = 0.0; } } /** * calculates and returns the factorial of the value * * @param value value of the root of the factorial * */ public double factorial(double value) { if(value <= 1.0) return value; else return value*factorial(value-1); } /** * calculates and returns the check sum of the message. * * @param message message of the name whick entered by the user. */ public long calChecksum(String message) { long check=0; for (int i=0;i<message.length();i++) check += message.charAt(i); return check; } public static void main(String[] args) { Calculator calculator = new Calculator(); calculator.pack(); calculator.setVisible(true); } }