rendered paste bodyimport java.awt.*;
import java.awt.FlowLayout;
import java.awt.event.*;
import java.awt.Color.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
public class Calculator extends JFrame implements ActionListener{
final int MAX_INPUT_LENGTH = 31;
final int INPUT_MODE = 0;
final int RESULT_MODE = 1;
final int ERROR_MODE = 2;
int displayMode;
// variables for memory buttons functionality
static double m1, m2;
int k = 1;
JButton butM1, butM2, butM3, butM4;
double lastNumber;
boolean clearOnNextDigit, percent;
String lastOperator;
JButton NumberedButtons[];
JButton but10, but11, but12, but13, but14, but15, but16, but17, but18, but19, but20, but21, but22;
JMenu jmenuEdit, jmenuView, jmenuHelp;
JMenuItem jmenuitemCopy, jmenuitemPaste, jmenuitemStandard, jmenuitemScientific, jmenuitemDigit, jmenuitemHelp, jmenuitemAbout;
Border raisedbevel, loweredbevel, border;
JLabel MemoryTextfield, LabelOutPut;
public Calculator()
{
border = LineBorder.createGrayLineBorder();
raisedbevel = BorderFactory.createRaisedBevelBorder();
loweredbevel = BorderFactory.createLoweredBevelBorder();
Font f12 = new Font("MS Shell Dlg", 0, 11);
Font f121 = new Font("MS Shell Dlg", 0, 12);
/*Edit menu*/
jmenuEdit = new JMenu("Edit");
jmenuEdit.setFont(f12);
jmenuEdit.setMnemonic(KeyEvent.VK_F);
// Edit->Copy, C - Mnemonic, CTRL-C - Accelerator
jmenuitemCopy = new JMenuItem(" Copy", KeyEvent.VK_C);
KeyStroke ctrlCKeyStroke = KeyStroke.getKeyStroke("control C");
jmenuitemCopy.setAccelerator(ctrlCKeyStroke);
jmenuitemCopy.setFont(f121);
jmenuitemCopy.addActionListener(this);
// Edit->Paste, P - Mnemonic, CTRL-V - Accelerator
jmenuitemPaste = new JMenuItem(" Paste");
KeyStroke ctrlPKeyStroke = KeyStroke.getKeyStroke("control P");
jmenuitemPaste.setAccelerator(ctrlPKeyStroke);
jmenuitemPaste.setFont(f121);
jmenuitemPaste.addActionListener(this);
jmenuEdit.add(jmenuitemCopy);
jmenuEdit.add(jmenuitemPaste);
/*View menu*/
jmenuView = new JMenu("View");
jmenuView.setFont(f12);
jmenuView.setMnemonic(KeyEvent.VK_H);
jmenuitemStandard = new JMenuItem(" Standard");
jmenuitemStandard.setFont(f121);
jmenuitemScientific = new JMenuItem(" Scientific");
jmenuitemScientific.setFont(f121);
jmenuitemDigit = new JMenuItem(" Digital grouping");
jmenuitemDigit.setFont(f121);
jmenuView.add(jmenuitemStandard);
jmenuView.add(jmenuitemScientific);
jmenuView.add(jmenuitemDigit);
/*Help menu*/
jmenuHelp = new JMenu("Help");
jmenuHelp.setFont(f12);
jmenuHelp.setMnemonic(KeyEvent.VK_H);
jmenuitemHelp = new JMenuItem(" Help Topics");
jmenuitemHelp.setFont(f121);
jmenuitemHelp.addActionListener(this);
jmenuitemAbout = new JMenuItem(" About calculator");
jmenuitemAbout.setFont(f121);
jmenuitemAbout.addActionListener(this);
jmenuHelp.add(jmenuitemHelp);
jmenuHelp.add(jmenuitemAbout);
JMenuBar mb = new JMenuBar();
mb.add(jmenuEdit);
mb.add(jmenuView);
mb.add(jmenuHelp);
//setJMenuBar(mb);
// Add components to frame
add(mb,BorderLayout.NORTH);
JPanel jplBackSpace, jplControl, jplButtons;
jplButtons = new JPanel();
// Set jplButton panel layout manager for a 4 by 5 grid
jplButtons.setLayout(new GridLayout(4, 5, 6, 6));
jplButtons.setBorder(new EmptyBorder(4, 12, 0, 0));
// Create numeric Jbuttons
NumberedButtons = new JButton[11];
for (int i=0; i<=9; i++)
{
ActionPerformedNumbers NumbersAction = new ActionPerformedNumbers();
// set each Jbutton label to the value of index
NumberedButtons[i] = new JButton(String.valueOf(i));
NumberedButtons[i].setMargin(new Insets(0, 0, 0, 0));
NumberedButtons[i].setFont(f12);
NumberedButtons[i].setForeground(Color.blue);
NumberedButtons[i].setBackground(new Color(242,243,238));
NumberedButtons[i].addActionListener(NumbersAction);
}
// Create operator Jbuttons
but10 = new JButton("+/-");
but10.setMargin(new Insets(0, 0, 0, 0));
but10.setFont(f12);
but10.setForeground(Color.blue);
but10.setBackground(new Color(242,243,238));
but10.addActionListener(this);
but11 = new JButton(".");
but11.setMargin(new Insets(0, 0, 0, 0));
but11.setFont(f12);
but11.setForeground(Color.blue);
but11.setBackground(new Color(242,243,238));
but11.addActionListener(this);
but12 = new JButton("=");
but12.setMargin(new Insets(0, 0, 0, 0));
but12.setFont(f12);
but12.setForeground(Color.red);
but12.setBackground(new Color(242,243,238));
but12.addActionListener(this);
but13 = new JButton("/");
but13.setMargin(new Insets(0, 0, 0, 0));
but13.setFont(f12);
but13.setForeground(Color.red);
but13.setBackground(new Color(242,243,238));
but13.addActionListener(this);
but14 = new JButton("*");
but14.setMargin(new Insets(0, 0, 0, 0));
but14.setFont(f12);
but14.setForeground(Color.red);
but14.setBackground(new Color(242,243,238));
but14.addActionListener(this);
but15 = new JButton("-");
but15.setFont(f12);
but15.setForeground(Color.red);
but15.setMargin(new Insets(0, 0, 0, 0));
but15.setBackground(new Color(242,243,238));
but15.addActionListener(this);
but16 = new JButton("+");
but16.setFont(f12);
but16.setForeground(Color.red);
but16.setMargin(new Insets(0, 0, 0, 0));
but16.setBackground(new Color(242,243,238));
but16.addActionListener(this);
but17 = new JButton("sqrt");
but17.setFont(f12);
but17.setForeground(Color.blue);
but17.setMargin(new Insets(0, 0, 0, 0));
but17.setBackground(new Color(242,243,238));
but17.addActionListener(this);
but18 = new JButton("1/x");
but18.setFont(f12);
but18.setForeground(Color.blue);
but18.setMargin(new Insets(0, 0, 0, 0));
but18.setBackground(new Color(242,243,238));
but18.addActionListener(this);
but19 = new JButton("%");
but19.setFont(f12);
but19.setForeground(Color.blue);
but19.setMargin(new Insets(0, 0, 0, 0));
but19.setBackground(new Color(242,243,238));
but19.addActionListener(this);
//panel is the main Jpanel, so it contains jplControl, jplControl2, JButtons
JPanel panel = new JPanel(new BorderLayout(0, 0));
getContentPane().add(panel, BorderLayout.CENTER);
panel.setBorder(new EmptyBorder(3, 9, 10, 9));
// panel.setBackground(Color.yellow);
//output numbers, result of calculations
LabelOutPut = new JLabel("0");
LabelOutPut.setHorizontalAlignment(JLabel.RIGHT);
LabelOutPut.setBackground(Color.WHITE);
LabelOutPut.setFont(f121);
LabelOutPut.setOpaque(true);
LabelOutPut.setPreferredSize(new Dimension(200,23));
LabelOutPut.setBorder(loweredbevel);
panel.add(LabelOutPut, BorderLayout.NORTH);
/*
JFormattedTextField formattedTextField = new JFormattedTextField();
panel.add(formattedTextField, BorderLayout.NORTH);
formattedTextField.setHorizontalAlignment(JFormattedTextField.RIGHT);
formattedTextField.setPreferredSize(new Dimension(105,22));
panel.add(formattedTextField,BorderLayout.NORTH);
*/
//text field for MC, MR, MS, M+
/*
JFormattedTextField MemoryTextfield = new JFormattedTextField();
MemoryTextfield.setBackground(new Color(237,237,237));
MemoryTextfield.setPreferredSize(new Dimension(27,26));
*/
MemoryTextfield = new JLabel("");
MemoryTextfield.setHorizontalAlignment(JLabel.CENTER);
MemoryTextfield.setBackground(new Color(237,237,237));
MemoryTextfield.setFont(f121);
MemoryTextfield.setOpaque(true);
MemoryTextfield.setPreferredSize(new Dimension(27,26));
MemoryTextfield.setBorder(loweredbevel);
panel.add(LabelOutPut, BorderLayout.NORTH);
JPanel panel_1 = new JPanel();
panel_1.setBorder(new EmptyBorder(0, 0, 0, 0));
panel.add(panel_1, BorderLayout.CENTER);
panel_1.setLayout(new BorderLayout(0, 0));
//Add buttons to keypad panel
// First row
jplButtons.add(NumberedButtons[7]);
jplButtons.add(NumberedButtons[8]);
jplButtons.add(NumberedButtons[9]);
// add button / and sqrt
jplButtons.add(but13);
jplButtons.add(but17);
// Second row
jplButtons.add(NumberedButtons[4]);
jplButtons.add(NumberedButtons[5]);
jplButtons.add(NumberedButtons[6]);
// add button * and x^2
jplButtons.add(but14);
jplButtons.add(but19);
// Third row
jplButtons.add(NumberedButtons[1]);
jplButtons.add(NumberedButtons[2]);
jplButtons.add(NumberedButtons[3]);
//adds button - and %
jplButtons.add(but15);
jplButtons.add(but18);
//Fourth Row
// add 0, +/-, ., +, and =
jplButtons.add(NumberedButtons[0]);
jplButtons.add(but10);
jplButtons.add(but11);
jplButtons.add(but16);
jplButtons.add(but12);
//Add jPanel jplButtons to jPanel panel_1
panel_1.add(jplButtons, BorderLayout.CENTER);
//jplControl is responsible for Backspace, CE, C
jplControl = new JPanel();
FlowLayout flowLayout = (FlowLayout) jplControl.getLayout();
flowLayout.setAlignment(FlowLayout.RIGHT);
jplControl.setBorder(new EmptyBorder(6, 0, 0, 0));
//jplControl.setBackground(Color.red);
panel_1.add(jplControl, BorderLayout.NORTH);
//buttons inside the jplControl
but20 = new JButton("Backspace");
but20.setMargin(new Insets(5, 1, 5, 1));
but20.setFont(f12);
but20.setForeground(Color.red);
but20.setBackground(new Color(242,243,238));
but20.addActionListener(this);
but21 = new JButton("CE");
but21.setMargin(new Insets(4, 21, 4, 21));
but21.setFont(f121);
but21.setForeground(Color.red);
but21.setBackground(new Color(242,243,238));
but21.addActionListener(this);
but22 = new JButton("C");
but22.setMargin(new Insets(4, 23, 4, 23));
but22.setFont(f121);
but22.setForeground(Color.red);
but22.setBackground(new Color(242,243,238));
but22.addActionListener(this);
JLabel emptySpace = new JLabel("");
jplControl.add(MemoryTextfield);
// jplControl.add(emptySpace);
jplControl.add(emptySpace);
jplControl.add(but20);
jplControl.add(but21);
jplControl.add(but22);
//jplControl2 is responsible for MC, MR, MS, M+
JPanel memoryPanel = new JPanel();
memoryPanel.setBorder(new EmptyBorder(2, 0, 0, 0));
JPanel jplControl2 = new JPanel(new GridLayout(4, 1, 7, 7));
panel_1.add(jplControl2, BorderLayout.WEST);
jplControl2.setBorder(new EmptyBorder(3, 0, 0, 0));
butM1 = new JButton("MC");
butM1.setMargin(new Insets(9, 4, 8, 4));
butM1.setFont(f121);
butM1.setForeground(Color.red);
butM1.setBackground(new Color(242,243,238));
butM1.addActionListener(this);
butM2 = new JButton("MR");
butM2.setMargin(new Insets(9, 4, 8, 4));
butM2.setFont(f121);
butM2.setForeground(Color.red);
butM2.setBackground(new Color(242,243,238));
butM2.addActionListener(this);
butM3 = new JButton("MS");
butM3.setMargin(new Insets(9, 4, 8, 4));
butM3.setFont(f121);
butM3.setForeground(Color.red);
butM3.setBackground(new Color(242,243,238));
butM3.addActionListener(this);
butM4 = new JButton("M+");
butM4.setMargin(new Insets(9, 4, 8, 4));
butM4.setFont(f121);
butM4.setForeground(Color.red);
butM4.setBackground(new Color(242,243,238));
butM4.addActionListener(this);
jplControl2.add(butM1);
jplControl2.add(butM2);
jplControl2.add(butM3);
jplControl2.add(butM4);
}
class ActionPerformedNumbers implements ActionListener{
public void actionPerformed(ActionEvent e){
for (int i=0; i<NumberedButtons.length; i++)
{
if(e.getSource() == NumberedButtons[i])
{
addDigitToDisplay(i);
}
}
}
}
class actionPerformedMenuBar implements ActionListener{
public void actionPerformed(ActionEvent e){
// this is for the Edit Menu Items - Copy and Paste - to work
e.getActionCommand();
Calculator calc = new Calculator();
if(e.getSource() == jmenuitemAbout){
JDialog dlgAbout = new AboutDialog(calc, "About Calculator", true);
dlgAbout.setVisible(true);
}else if(e.getSource() == jmenuitemHelp){
JDialog dlgHelp = new HelpDialog(calc, "Calculator - Help", true);
dlgHelp.setVisible(true);
}
}
//starts subclass for menu items
class AboutDialog extends JDialog implements ActionListener {
JButton jbnOk;
Font f121 = new Font("MS Shell Dlg", 0, 12);
AboutDialog(JFrame parent, String title, boolean modal){
super(parent, title, modal);
setBackground(new Color(242,243,238));
JPanel p1 = new JPanel(new BorderLayout(0, 0));
p1.setBorder(new EmptyBorder(0, 0, 0, 0));
StringBuffer text = new StringBuffer();
text.append("Java Swing Calculator\n\n");
text.append("This calculator has been developed for a college course \nassignment and is an open source software.\n\nIts source code is licensed for copy and/or modification.\nSo feel free to adapt it to your own needs.\n\n");
text.append("Version: 1.0\n");
text.append("Developer: Miguel\n");
text.append("Contact: miguel@procopio.co.uk\n");
text.append("______________________________________________\n");
text.append("Procopio Web Solutions - 0843 289 2986\n");
JLabel calcImg = new JLabel(new ImageIcon("images/6039.png"));
calcImg.setBorder(new EmptyBorder(0, 15, 0, 0));
JLabel AboutImg = new JLabel(new ImageIcon("images/AboutIMG.png"));
JTextArea jtAreaAbout = new JTextArea(2, 21);
jtAreaAbout.setText(text.toString());
jtAreaAbout.setFont(f121);
jtAreaAbout.setEditable(false);
jtAreaAbout.setBackground(null);
jtAreaAbout.setBorder(new EmptyBorder(15, 15, 0, 0));
p1.add(AboutImg, BorderLayout.NORTH);
p1.add(calcImg, BorderLayout.WEST);
p1.add(jtAreaAbout);
getContentPane().add(p1, BorderLayout.CENTER);
JPanel p2 = new JPanel(new FlowLayout(FlowLayout.CENTER));
jbnOk = new JButton(" OK ");
jbnOk.addActionListener(this);
p2.add(jbnOk);
getContentPane().add(p2, BorderLayout.SOUTH);
setLocation(300, 200);
setResizable(false);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
{
Window aboutDialogWindow = e.getWindow();
aboutDialogWindow.dispose();
}
}
);
pack();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == jbnOk) {
this.dispose();
}
}
}
// Help Menu Item
class HelpDialog extends JDialog implements ActionListener {
JButton jbnOk;
Font f121 = new Font("MS Shell Dlg", 0, 12);
HelpDialog(JFrame parent, String title, boolean modal){
super(parent, title, modal);
setBackground(new Color(242,243,238));
JPanel p1 = new JPanel(new BorderLayout(0, 0));
p1.setBorder(new EmptyBorder(0, 0, 0, 0));
StringBuffer text = new StringBuffer();
text.append("Java Swing Calculator Overview\n\n");
text.append("You can use this calculator to perform any of the standard \noperations for which you would normally use a handheld \ncalculator. \n\nThis calculator performs basic arithmetic, such as addition, \nsubtraction, multiplication and division as well as functions. \n\nButtons definitions:\n\n");
text.append("/ Divide MC Memory Clear\n");
text.append("* Multiply MR Memory Remind\n");
text.append("- Minus MS Memory Save\n");
text.append("+ Addition M+ Memory Add\n\n");
text.append("sqrt = Square Root C Clear\n");
text.append("% = Percentage CE Clear Existing\n");
text.append("1/x - Reciprocal\n");
text.append("______________________________________________\n");
text.append("Help Line - 0843 289 2986\n");
JLabel calcImg = new JLabel(new ImageIcon("images/6039.png"));
calcImg.setBorder(new EmptyBorder(0, 15, 0, 0));
JLabel AboutImg = new JLabel(new ImageIcon("images/AboutIMG.png"));
JTextArea jtAreaHelp = new JTextArea(2, 21);
jtAreaHelp.setText(text.toString());
jtAreaHelp.setFont(f121);
jtAreaHelp.setEditable(false);
jtAreaHelp.setBackground(null);
jtAreaHelp.setBorder(new EmptyBorder(15, 15, 0, 0));
p1.add(AboutImg, BorderLayout.NORTH);
p1.add(calcImg, BorderLayout.WEST);
p1.add(jtAreaHelp);
getContentPane().add(p1, BorderLayout.CENTER);
JPanel p2 = new JPanel(new FlowLayout(FlowLayout.CENTER));
jbnOk = new JButton(" OK ");
jbnOk.addActionListener(this);
p2.add(jbnOk);
getContentPane().add(p2, BorderLayout.SOUTH);
setLocation(300, 100);
setResizable(false);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
{
Window aboutDialogWindow = e.getWindow();
aboutDialogWindow.dispose();
}
}
);
pack();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == jbnOk) {
this.dispose();
}
}
}
}
public void actionPerformed(ActionEvent e){
double result = 0;
// +/-
if(e.getSource() == but10)
{
processSignChange();
}
// decimal point
else if(e.getSource() == but11)
{
addDecimalPoint();
}
// =
else if(e.getSource() == but12)
{
processEquals();
}
// divide
else if(e.getSource() == but13)
{
processOperator("/");
}
// *
else if(e.getSource() == but14)
{
processOperator("*");
}
// -
else if(e.getSource() == but15)
{
processOperator("-");
}
// +
else if(e.getSource() == but16)
{
processOperator("+");
}
// sqrt
else if(e.getSource() == but17)
{
if (displayMode != ERROR_MODE)
{
try
{
if (getDisplayString().indexOf("-") == 0)
displayError("Invalid input for function!");
result = Math.sqrt(getNumberInDisplay());
displayResult(result);
}
catch(Exception ex)
{
displayError("Invalid input for function!");
displayMode = ERROR_MODE;
}
}
}
// 1/x
else if(e.getSource() == but18)
{
if (displayMode != ERROR_MODE){
try
{
if (getNumberInDisplay() == 0)
displayError("Cannot divide by zero!");
result = 1 / getNumberInDisplay();
displayResult(result);
}
catch(Exception ex) {
displayError("Cannot divide by zero!");
displayMode = ERROR_MODE;
}
}
}
// %
else if(e.getSource() == but19)
{
if (displayMode != ERROR_MODE){
try {
result = getNumberInDisplay() / 100;
displayResult(result);
}
catch(Exception ex) {
displayError("Invalid input for function!");
displayMode = ERROR_MODE;
}
}
}
// backspace
else if(e.getSource() == but20)
{
if (displayMode != ERROR_MODE){
setDisplayString(getDisplayString().substring(0,
getDisplayString().length() - 1));
if (getDisplayString().length() < 1)
setDisplayString("0");
}
}
// CE
else if(e.getSource() == but21)
{
clearExisting();
}
// C
else if(e.getSource() == but22)
{
clearAll();
}
// MC
else if(e.getSource() == butM1) {
m1 = 0;
MemoryTextfield.setText("");
LabelOutPut.getText();
}
// MR
else if(e.getSource() == butM2) {
LabelOutPut.setText("");
LabelOutPut.setText(LabelOutPut.getText() + m1);
LabelOutPut.getText();
clearOnNextDigit = true;
}
// MS
else if(e.getSource() == butM3) {
m1 = Double.parseDouble(LabelOutPut.getText());
LabelOutPut.setText("");
LabelOutPut.setText(LabelOutPut.getText() + m1);
MemoryTextfield.setText("M");
LabelOutPut.getText();
clearOnNextDigit = true;
}
// M+
else if(e.getSource() == butM4) {
if (k == 1) {
m1 = Double.parseDouble(LabelOutPut.getText());
k++;
} else {
m1 += Double.parseDouble(LabelOutPut.getText());
LabelOutPut.setText("" + m1);
}
}
}
void setDisplayString(String s){
LabelOutPut.setText(s);
}
String getDisplayString (){
return LabelOutPut.getText();
}
void addDigitToDisplay(int digit){
if (clearOnNextDigit)
setDisplayString("");
String inputString = getDisplayString();
if (inputString.indexOf("0") == 0){
inputString = inputString.substring(1);
}
if ((!inputString.equals("0") || digit > 0) && inputString.length() < MAX_INPUT_LENGTH){
setDisplayString(inputString + digit);
}
displayMode = INPUT_MODE;
clearOnNextDigit = false;
}
void addDecimalPoint(){
displayMode = INPUT_MODE;
if (clearOnNextDigit)
setDisplayString("");
String inputString = getDisplayString();
// If the input string already contains a decimal point, don't
// do anything to it.
if (inputString.indexOf(".") < 0)
setDisplayString(new String(inputString + "."));
}
void processSignChange(){
if (displayMode == INPUT_MODE)
{
String input = getDisplayString();
if (input.length() > 0 && !input.equals("0"))
{
if (input.indexOf("-") == 0)
setDisplayString(input.substring(1));
else
setDisplayString("-" + input);
}
}
else if (displayMode == RESULT_MODE)
{
double numberInDisplay = getNumberInDisplay();
if (numberInDisplay != 0)
displayResult(-numberInDisplay);
}
}
void clearAll() {
setDisplayString("0");
lastOperator = "0";
lastNumber = 0;
displayMode = INPUT_MODE;
clearOnNextDigit = true;
}
void clearExisting(){
setDisplayString("0");
clearOnNextDigit = true;
displayMode = INPUT_MODE;
}
double getNumberInDisplay() {
String input = LabelOutPut.getText();
return Double.parseDouble(input);
}
void processOperator(String op) {
if (displayMode != ERROR_MODE)
{
double numberInDisplay = getNumberInDisplay();
if (!lastOperator.equals("0"))
{
try
{
double result = processLastOperator();
displayResult(result);
lastNumber = result;
}
catch (DivideByZeroException e)
{
}
}
else
{
lastNumber = numberInDisplay;
}
clearOnNextDigit = true;
lastOperator = op;
}
}
void displayResult(double result){
setDisplayString(Double.toString(result));
lastNumber = result;
displayMode = RESULT_MODE;
clearOnNextDigit = true;
}
void processEquals(){
double result = 0;
if (displayMode != ERROR_MODE){
try
{
result = processLastOperator();
displayResult(result);
}
catch (DivideByZeroException e) {
displayError("Cannot divide by zero!");
}
lastOperator = "0";
}
}
double processLastOperator() throws DivideByZeroException {
double result = 0;
double numberInDisplay = getNumberInDisplay();
if (lastOperator.equals("/"))
{
if (numberInDisplay == 0)
throw (new DivideByZeroException());
result = lastNumber / numberInDisplay;
}
if (lastOperator.equals("*"))
result = lastNumber * numberInDisplay;
if (lastOperator.equals("-"))
result = lastNumber - numberInDisplay;
if (lastOperator.equals("+"))
result = lastNumber + numberInDisplay;
return result;
}
void displayError(String errorMessage){
setDisplayString(errorMessage);
lastNumber = 0;
displayMode = ERROR_MODE;
clearOnNextDigit = true;
}
public static void setNativeLookAndFeel() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {
System.out.println("Error setting native LAF: " + e);
}
}
public static void main(String Args[]){
//notice that the method setNativeLookAndFeel() is called before an instance of Calculator is created.
setNativeLookAndFeel();
Calculator calc = new Calculator();
calc.setTitle("Calculator");
calc.setBackground(new Color(236,233,216));
calc.setIconImage(new ImageIcon("images/6039.png").getImage());
calc.pack();
calc.setLocation(400, 250);
calc.setVisible(true);
calc.setSize(270,265);
calc.setResizable(true);
calc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
calc.clearAll();
//Add panel and Menu bar to frame
}
}
class DivideByZeroException extends Exception{
public DivideByZeroException()
{
super();
}
public DivideByZeroException(String s)
{
super(s);
}
}