Hi,
how i can fix my code to support keyboard input?
/*
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package calculater1;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import java.awt.Container.*;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import java.awt.event.ActionListener;
/**
*
* @author al_khtaiob
*/
public class Calcu extends JFrame implements ActionListener{
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 ="0";
private JLabel jlbOutput;
private JButton jbnButtons[];
private JPanel jplMaster, jplBackSpace, jplControl, jplButtons;
Font f12 = new Font("Times New Roman", 0, 12);
Font f121 = new Font("Times New Roman", 1, 12);
public Calcu(){
super("Simple Calculater");
setBackground(Color.gray);
//output label..
jlbOutput = new JLabel("0");
jlbOutput.setBackground(Color.WHITE);
jlbOutput.setOpaque(true); //paints every pixel within the Jcomponent bounds
//I've used border and grid layout to design this calculter
getContentPane().add(jlbOutput, BorderLayout.NORTH);
//input buttons..
jbnButtons = new JButton[22];
jplButtons = new JPanel();
// 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));
}
//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("sqrt");
jbnButtons[17] = new JButton("1/x");
jbnButtons[18] = new JButton("%");
//Controls Jbuttons
jplBackSpace = new JPanel();// panel for the backSpace
jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));
Icon bug = new ImageIcon(getClass().getResource("pug1.GIF"));
jbnButtons[19] = new JButton(bug);
jplBackSpace.add(jbnButtons[19]);
////////////////////////////////////////////////////////////////
jplControl = new JPanel();// panel for clear buttons
jplControl.setLayout(new GridLayout(1, 2, 2 ,2));
jbnButtons[20] = new JButton(" CE ");
jbnButtons[21] = new JButton("C");
jplControl.add(jbnButtons[20]);
jplControl.add(jbnButtons[21]);
////////////////////////////////////////////////////////////////
//panel for keypad buttons
jplButtons.setLayout(new GridLayout(4, 5, 2, 2));
//Add buttons to keypad panel starting at top left
// First row
for(int i=7; i<=9; i++) {
jplButtons.add(jbnButtons[i]);
}
// add button "/" and "sqrt"
jplButtons.add(jbnButtons[12]);
jplButtons.add(jbnButtons[16]);
// Second row
for(int i=4; i<=6; i++)
{
jplButtons.add(jbnButtons[i]);
}
// add button "*" and "x^2"
jplButtons.add(jbnButtons[13]);
jplButtons.add(jbnButtons[17]);
// Third row
for( int i=1; i<=3; i++)
{
jplButtons.add(jbnButtons[i]);
}
//adds button "-" and "%"
jplButtons.add(jbnButtons[14]);
jplButtons.add(jbnButtons[18]);
//Fourth Row
// add "0",".", "+", "="
jplButtons.add(jbnButtons[0]);
jplButtons.add(jbnButtons[10]);
jplButtons.add(jbnButtons[15]);
jplButtons.add(jbnButtons[11]);
//Managing the Master panel contains all other panels with border layout
jplMaster = new JPanel();
jplMaster.setLayout(new BorderLayout());
jplMaster.add(jplBackSpace, BorderLayout.WEST);// adding the BS at west
jplMaster.add(jplControl, BorderLayout.EAST);// adding Controls at east
jplMaster.add(jplButtons, BorderLayout.SOUTH);// adding Buttons at south
//adding Master panel to south of the frame
getContentPane().add(jplMaster, BorderLayout.SOUTH);
requestFocus();// to make Master panel the focused Window, must be displayable, focusable, visible..
//Add ActionListener to the buttons
for (int i=0; i<jbnButtons.length; i++){
jbnButtons[i].addActionListener(this);
}
}//end of constructor
public void actionPerformed(ActionEvent e) {
double result = 0;
// Search for the button pressed until end of array or key found
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: //for decimal point
// processSignChange();
// break;
case 10: //for decimal point
addDecimalPoint();
break;
case 11: //for =
processEquals();
break;
case 12: //for divide
processOperator("/");
break;
case 13: //for *
processOperator("*");
break;
case 14: //for -
processOperator("-");
break;
case 15: //for +
processOperator("+");
break;
case 16: // sqrt
if (displayMode != ERROR_MODE)// شرط متحقق
{
try
{
//return error if sqrt for a negatine number..
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 17: // 1/x
if (displayMode != ERROR_MODE){
try
{
//retrun error msg if divided by 0
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;
case 18: // %
if (displayMode != ERROR_MODE){
try {
result = getNumberInDisplay() / 100;
displayResult(result);
}
catch(Exception ex) {
displayError("Invalid input for function!");
displayMode = ERROR_MODE;
}
}
break;
case 19: //for backspace
if (displayMode != ERROR_MODE){
//substring() Returns a new string that is a substring of Displayed String.
setDisplayString(getDisplayString().substring(0,
getDisplayString().length() - 1));
//if the displayed string has only one number..
if (getDisplayString().length() < 1)
setDisplayString("0");
}
break;
case 20: //for CE
//to reset the displaying area..
clearExisting();
break;
case 21: //for C
//to clear the displayed area..
clearAll();
break;
}
}
}
}// end of action performed
void setDisplayString(String s){
jlbOutput.setText(s);
}
String getDisplayString (){
return jlbOutput.getText();
}
void addDigitToDisplay(int digit){
//empty in the begining
if (clearOnNextDigit)// ture by defualt.. just for the first time will performed
setDisplayString("");
String inputString = getDisplayString();//تحتوي على الرقم المدخل من اليوزر
if (inputString.indexOf("0") == 0){// هنا ان ادخل المستخدم الرقم الأول نجعل ما يؤشره على السترنق المدخل يبدأ من الاندكس الي وراه يعني لو كان بدو يدخل 12 و دخل 1 و بدو يدخل 2 حتى ما تروح ال1
inputString = inputString.substring(1);
}
if ((!inputString.equals("0") || digit > 0) && inputString.length() < MAX_INPUT_LENGTH){
setDisplayString(inputString + digit);// فعليا gettext من المدخل حسب setDisplayString = "" فارغة و لما نضفلها الديجت فعليا بنكون ضفنا شو دخل اليوزر
}
displayMode = INPUT_MODE;
clearOnNextDigit = false;// to make the first condition not true at the next time..
}
void addDecimalPoint(){
displayMode = INPUT_MODE;
if (clearOnNextDigit)
setDisplayString("");
String inputString = getDisplayString();
//if index of "." < 0 means it's not exists at the number so add it otherwise "it's exist" do nothing
if (inputString.indexOf(".") < 0)
setDisplayString(new String(inputString + "."));
}
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();
//System.out.println("hhhhh");
//if it was any one of the operators, processLastOperator which return the result of the done operation..
if (!lastOperator.equals("0"))
{
//System.out.println("nirmeen");
try
{
double result = processLastOperator();
displayResult(result);// to show the result at the display area
lastNumber = result;
}
catch (DivideByZeroException e)
{
}
}
else
{
lastNumber = numberInDisplay;
}
clearOnNextDigit = true;
lastOperator = op;
}
}
void processEquals(){
double result = 0;
if (displayMode != ERROR_MODE){
try
{
//System.out.println("nirmeenTest!!!");
result = processLastOperator();// return result
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;
}
}//end of class
class DivideByZeroException extends Exception{
public DivideByZeroException()
{
super();
}
public DivideByZeroException(String s)
{
super(s);
}
}
