SIMPLE CALCULATOR PROGRAM USING J FRAME
Given Bellow Is a java Program To create a simple calculator......
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener{
// Variables
final int MAX_INPUT_LENGTH = 20;
final int INPUT_MODE = 0;
final int RESULT_MODE = 1;
final int ERROR_MODE = 2;
int displayMode;
boolean clearOnNextDigit, percent;
double lastNumber;
String lastOperator;
int dot;
private JLabel jlbOutput;
private JButton jbnButtons[];
private JPanel jplMaster, jplBackSpace, jplControl;
/*
* Font(String name, int style, int size)
Creates a new Font from the specified name, style and point size.
*/
Font f12 = new Font("Times New Roman", 0, 12);
Font f121 = new Font("Times New Roman", 1, 12);
// Constructor
public Calculator()
{
setBackground(Color.gray);
jplMaster = new JPanel();
jlbOutput = new JLabel("0");
jlbOutput.setHorizontalTextPosition(JLabel.RIGHT);
jlbOutput.setBackground(Color.WHITE);
jlbOutput.setOpaque(true);
// Add components to frame
getContentPane().add(jlbOutput, BorderLayout.NORTH);
jbnButtons = new JButton[23];
//GridLayout(int rows, int cols, int hgap, int vgap)
JPanel jplButtons = new JPanel(); // container for Jbuttons
// Create numeric Jbuttons
for (int i=0; i<=9; i++)
{
// set each Jbutton label to the value of index
jbnButtons[i] = new JButton(String.valueOf(i));
}
// Create operator Jbuttons
jbnButtons[10] = new JButton("+/-");
jbnButtons[11] = new JButton(".");
jbnButtons[12] = new JButton("=");
jbnButtons[13] = new JButton("/");
jbnButtons[14] = new JButton("*");
jbnButtons[15] = new JButton("-");
jbnButtons[16] = new JButton("+");
jbnButtons[20] = new JButton("sqrt");
jbnButtons[21] = new JButton("X^2");
jbnButtons[22] = new JButton("1/X");
jplBackSpace = new JPanel();
jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));
jbnButtons[17] = new JButton("Backspace");
jplBackSpace.add(jbnButtons[17]);
jplControl = new JPanel();
jplControl.setLayout(new GridLayout(1, 2, 2 ,2));
jbnButtons[18] = new JButton(" CE ");
jbnButtons[19] = new JButton("C");
jplControl.add(jbnButtons[18]);
jplControl.add(jbnButtons[19]);
//Setting all Numbered JButton's to Blue. The rest to Red
for (int i=0; i<jbnButtons.length; i++) {
jbnButtons[i].setFont(f12);
if (i<10)
jbnButtons[i].setForeground(Color.blue);
else
jbnButtons[i].setForeground(Color.red);
}
// Set panel layout manager for a 5 by 4 grid
jplButtons.setLayout(new GridLayout(5, 4, 2, 2));
//Add buttons to keypad panel starting at top left
// First row
for(int i=7; i<=9; i++) {
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[16]);// +
// Second row
for(int i=4; i<=6; i++)
{
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[15]);// -
// Third row
for( int i=1; i<=3; i++)
{
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[14]);// *
//4th row
jplButtons.add(jbnButtons[10]);// +/-
jplButtons.add(jbnButtons[0]);
jplButtons.add(jbnButtons[11]);// .
jplButtons.add(jbnButtons[13]);// /
//5 th row
jplButtons.add(jbnButtons[12]); // =
jplButtons.add(jbnButtons[20]);// sqrt
jplButtons.add(jbnButtons[21]);// x^2
jplButtons.add(jbnButtons[22]);// 1/x
jplMaster.setLayout(new BorderLayout());
jplMaster.add(jplBackSpace, BorderLayout.WEST);
jplMaster.add(jplControl, BorderLayout.EAST);
jplMaster.add(jplButtons, BorderLayout.SOUTH);
// Add components to frame
getContentPane().add(jplMaster, BorderLayout.SOUTH);
requestFocus();
//activate ActionListener
for (int i=0; i<jbnButtons.length; i++){
jbnButtons[i].addActionListener(this);
}
clearAll();
//add WindowListener for closing frame and ending program
addWindowListener(new WindowAdapter()
{
public void windowClosed(WindowEvent e)
{
System.exit(0);
}
}
);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} //End of Contructor Calculator
public void actionPerformed(ActionEvent e){
double result = 0;
for (int i=0; i<jbnButtons.length; i++)
{
if(e.getSource() == jbnButtons[i])
{
switch(i)
{
case 0:
addDigitToDisplay(i);
break;
case 1:
addDigitToDisplay(i);
break;
case 2:
addDigitToDisplay(i);
break;
case 3:
addDigitToDisplay(i);
break;
case 4:
addDigitToDisplay(i);
break;
case 5:
addDigitToDisplay(i);
break;
case 6:
addDigitToDisplay(i);
break;
case 7:
addDigitToDisplay(i);
break;
case 8:
addDigitToDisplay(i);
break;
case 9:
addDigitToDisplay(i);
break;
case 10: // +/-
processSignChange();
break;
case 11: // decimal point
clearOnNextDigit = false;
addDecimalPoint();
break;
case 12: // =
processEquals();
break;
case 13: // divide
processOperator("/");
break;
case 14: // *
processOperator("*");
break;
case 15: // -
processOperator("-");
break;
case 16: // +
processOperator("+");
break;
case 17: // backspace
if (displayMode != ERROR_MODE){
setDisplayString(getDisplayString().substring(0,
getDisplayString().length() - 1));
if (getDisplayString().length() < 1)
setDisplayString("0");
}
break;
case 18: // CE
clearExisting();
break;
case 19: // C
clearAll();
break;
case 20:
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;
}
}
break;
case 21:
double num=getNumberInDisplay();
result=num*num;
displayResult(result);
break;
case 22:
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;
}
}
break;
}
}
}
}
void setDisplayString(String s){
jlbOutput.setText(s);
}
String getDisplayString (){
return jlbOutput.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 (inputString.indexOf(".") < 0)
{
setDisplayString(new String(inputString + "."));
//dot=0;
}
}
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 = jlbOutput.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 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 displayResult(double result){
setDisplayString(Double.toString(result));
lastNumber = result;
displayMode = RESULT_MODE;
clearOnNextDigit = true;
}
void displayError(String errorMessage){
setDisplayString(errorMessage);
lastNumber = 0;
displayMode = ERROR_MODE;
clearOnNextDigit = true;
}
public static void main(String args[]) {
Calculator calc = new Calculator();
Container contentPane = calc.getContentPane();
calc.setTitle("Calculator");
calc.setSize(241, 217);
calc.pack();
calc.setLocation(400, 250);
calc.setVisible(true);
calc.setResizable(false);
}
} //End of Swing Calculator Class.
class DivideByZeroException extends Exception{
public DivideByZeroException()
{
super();
}
public DivideByZeroException(String s)
{
super(s);
}
}
Given Bellow Is a java Program To create a simple calculator......
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener{
// Variables
final int MAX_INPUT_LENGTH = 20;
final int INPUT_MODE = 0;
final int RESULT_MODE = 1;
final int ERROR_MODE = 2;
int displayMode;
boolean clearOnNextDigit, percent;
double lastNumber;
String lastOperator;
int dot;
private JLabel jlbOutput;
private JButton jbnButtons[];
private JPanel jplMaster, jplBackSpace, jplControl;
/*
* Font(String name, int style, int size)
Creates a new Font from the specified name, style and point size.
*/
Font f12 = new Font("Times New Roman", 0, 12);
Font f121 = new Font("Times New Roman", 1, 12);
// Constructor
public Calculator()
{
setBackground(Color.gray);
jplMaster = new JPanel();
jlbOutput = new JLabel("0");
jlbOutput.setHorizontalTextPosition(JLabel.RIGHT);
jlbOutput.setBackground(Color.WHITE);
jlbOutput.setOpaque(true);
// Add components to frame
getContentPane().add(jlbOutput, BorderLayout.NORTH);
jbnButtons = new JButton[23];
//GridLayout(int rows, int cols, int hgap, int vgap)
JPanel jplButtons = new JPanel(); // container for Jbuttons
// Create numeric Jbuttons
for (int i=0; i<=9; i++)
{
// set each Jbutton label to the value of index
jbnButtons[i] = new JButton(String.valueOf(i));
}
// Create operator Jbuttons
jbnButtons[10] = new JButton("+/-");
jbnButtons[11] = new JButton(".");
jbnButtons[12] = new JButton("=");
jbnButtons[13] = new JButton("/");
jbnButtons[14] = new JButton("*");
jbnButtons[15] = new JButton("-");
jbnButtons[16] = new JButton("+");
jbnButtons[20] = new JButton("sqrt");
jbnButtons[21] = new JButton("X^2");
jbnButtons[22] = new JButton("1/X");
jplBackSpace = new JPanel();
jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));
jbnButtons[17] = new JButton("Backspace");
jplBackSpace.add(jbnButtons[17]);
jplControl = new JPanel();
jplControl.setLayout(new GridLayout(1, 2, 2 ,2));
jbnButtons[18] = new JButton(" CE ");
jbnButtons[19] = new JButton("C");
jplControl.add(jbnButtons[18]);
jplControl.add(jbnButtons[19]);
//Setting all Numbered JButton's to Blue. The rest to Red
for (int i=0; i<jbnButtons.length; i++) {
jbnButtons[i].setFont(f12);
if (i<10)
jbnButtons[i].setForeground(Color.blue);
else
jbnButtons[i].setForeground(Color.red);
}
// Set panel layout manager for a 5 by 4 grid
jplButtons.setLayout(new GridLayout(5, 4, 2, 2));
//Add buttons to keypad panel starting at top left
// First row
for(int i=7; i<=9; i++) {
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[16]);// +
// Second row
for(int i=4; i<=6; i++)
{
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[15]);// -
// Third row
for( int i=1; i<=3; i++)
{
jplButtons.add(jbnButtons[i]);
}
jplButtons.add(jbnButtons[14]);// *
//4th row
jplButtons.add(jbnButtons[10]);// +/-
jplButtons.add(jbnButtons[0]);
jplButtons.add(jbnButtons[11]);// .
jplButtons.add(jbnButtons[13]);// /
//5 th row
jplButtons.add(jbnButtons[12]); // =
jplButtons.add(jbnButtons[20]);// sqrt
jplButtons.add(jbnButtons[21]);// x^2
jplButtons.add(jbnButtons[22]);// 1/x
jplMaster.setLayout(new BorderLayout());
jplMaster.add(jplBackSpace, BorderLayout.WEST);
jplMaster.add(jplControl, BorderLayout.EAST);
jplMaster.add(jplButtons, BorderLayout.SOUTH);
// Add components to frame
getContentPane().add(jplMaster, BorderLayout.SOUTH);
requestFocus();
//activate ActionListener
for (int i=0; i<jbnButtons.length; i++){
jbnButtons[i].addActionListener(this);
}
clearAll();
//add WindowListener for closing frame and ending program
addWindowListener(new WindowAdapter()
{
public void windowClosed(WindowEvent e)
{
System.exit(0);
}
}
);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} //End of Contructor Calculator
public void actionPerformed(ActionEvent e){
double result = 0;
for (int i=0; i<jbnButtons.length; i++)
{
if(e.getSource() == jbnButtons[i])
{
switch(i)
{
case 0:
addDigitToDisplay(i);
break;
case 1:
addDigitToDisplay(i);
break;
case 2:
addDigitToDisplay(i);
break;
case 3:
addDigitToDisplay(i);
break;
case 4:
addDigitToDisplay(i);
break;
case 5:
addDigitToDisplay(i);
break;
case 6:
addDigitToDisplay(i);
break;
case 7:
addDigitToDisplay(i);
break;
case 8:
addDigitToDisplay(i);
break;
case 9:
addDigitToDisplay(i);
break;
case 10: // +/-
processSignChange();
break;
case 11: // decimal point
clearOnNextDigit = false;
addDecimalPoint();
break;
case 12: // =
processEquals();
break;
case 13: // divide
processOperator("/");
break;
case 14: // *
processOperator("*");
break;
case 15: // -
processOperator("-");
break;
case 16: // +
processOperator("+");
break;
case 17: // backspace
if (displayMode != ERROR_MODE){
setDisplayString(getDisplayString().substring(0,
getDisplayString().length() - 1));
if (getDisplayString().length() < 1)
setDisplayString("0");
}
break;
case 18: // CE
clearExisting();
break;
case 19: // C
clearAll();
break;
case 20:
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;
}
}
break;
case 21:
double num=getNumberInDisplay();
result=num*num;
displayResult(result);
break;
case 22:
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;
}
}
break;
}
}
}
}
void setDisplayString(String s){
jlbOutput.setText(s);
}
String getDisplayString (){
return jlbOutput.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 (inputString.indexOf(".") < 0)
{
setDisplayString(new String(inputString + "."));
//dot=0;
}
}
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 = jlbOutput.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 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 displayResult(double result){
setDisplayString(Double.toString(result));
lastNumber = result;
displayMode = RESULT_MODE;
clearOnNextDigit = true;
}
void displayError(String errorMessage){
setDisplayString(errorMessage);
lastNumber = 0;
displayMode = ERROR_MODE;
clearOnNextDigit = true;
}
public static void main(String args[]) {
Calculator calc = new Calculator();
Container contentPane = calc.getContentPane();
calc.setTitle("Calculator");
calc.setSize(241, 217);
calc.pack();
calc.setLocation(400, 250);
calc.setVisible(true);
calc.setResizable(false);
}
} //End of Swing Calculator Class.
class DivideByZeroException extends Exception{
public DivideByZeroException()
{
super();
}
public DivideByZeroException(String s)
{
super(s);
}
}
No comments:
Post a Comment