Assign a keyboard key to a JButton.

[gszauer]

So, i need some help
I want to press a key, and invoke the action of a coresponding button.
So, for instance, if i press the key 1, i would like my jbutton (button[1]) to "be pressed"

Here is the keyboard scanning code i wrote
[HIGHLIGHT="Java5"]public void keyReleased(KeyEvent e){
}

public void keyTyped(KeyEvent e){
}

public void keyPressed (KeyEvent e){
keyID = e.getID();
if (keyID == 97 || keyID == 49){
// 1
} else if (keyID == 98 || keyID == 50){
// 2
} else if (keyID == 99 || keyID == 51){
// 3
} else if (keyID == 100 || keyID == 52){
// 4
} else if (keyID == 101 || keyID == 53){
// 5
} else if (keyID == 102 || keyID == 54){
// 6
} else if (keyID == 103 || keyID == 55){
// 7
} else if (keyID == 104 || keyID == 56){
// 8
} else if (keyID == 105 || keyID == 57){
// 9
} else if (keyID == 110 || keyID == 46){
// .
} else if (keyID == 10){
// =
} else if (keyID == 107){
// +
} else if (keyID == 109){
// -
} else if (keyID == 106){
// *
} else if (keyID == 111){
// /
} else if (keyID == 67){
// C
}
JOptionPane.showMessageDialog(null, keyID+" Was Pressed", "Exception Error", JOptionPane.INFORMATION_MESSAGE);
}[/HIGHLIGHT]

My class is
[HIGHLIGHT="Java5"]public class Calculator extends JFrame implements ActionListener, KeyListener {[/HIGHLIGHT]

So i have
[HIGHLIGHT="Java5"]this.addKeyListener(this);[/HIGHLIGHT]

But when i press a key i am not informed that a key was pressed by the JOptionPane, so i take im not doing something right.

ALSO, once i have it so where its listening for keypresses correctly, how can i get it to "Press" certin buttons for me?
For instance, where my code has //C I would like for it to execute the action that i execute when the JButton calculate = new JButton("C"); button is pressed....

Can anyone offer any guidance?

[domestic]

Get key. This bassically monitors the jframe (you called it Calculator), and runs everytime a key is pressed. It then stores the value in variable ke for easy access. It will then go through list to see what the value means.

NB: requires importing of String

[HIGHLIGHT="Java"]
private void Calculator(java.awt.event.KeyEvent evt) {
int ke = evt.getKeyCode();

if (ke==10) String keypress = "Enter";
else if......etc etc; < insert your keyevent codes here


JOptionPane.showMessageDialog(null, "key pressed was " keypress, "key pressed", JOptionPane.INFORMATION_MESSAGE);
}
[/HIGHLIGHT]

[G_Morgan]

You first need to attach a KeyListener to the object though. That method won't get called otherwise.

//edit - sorry didn't see there was already a KeyListener. My bad.//

[domestic]

very easy if you use netbeans. just select the form, choose events and then keylistener. puts in all the extra code. don't know if any other programs do this too though. only used nb and blueJ

[gszauer]

Sorry for the delay in response, i had some stuff to take care of.
While i was gone i actually solved the problem myself, here is how:

[HIGHLIGHT="Java5"]import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Calculator extends JFrame implements ActionListener, KeyListener {
private int width, height, keyID;
private double num1, num2, temp;
private char operation = 'x', operator;
private boolean isFirst = true, hasDecimal = false;
private String buffer;
private String[] labels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", "+/-", ".", "+"};
private JButton[] buttons;
private JButton calculate, clear;
private JTextField output;

public Calculator (){
Container pane = getContentPane();
pane.setLayout(null);

output = new JTextField();
output.setEditable(false);
output.setLocation (5, 5);
output.setSize(215, 20);
output.setHorizontalAlignment(JTextField.RIGHT);
pane.add(output);

buttons = new JButton[16];
width = 5; height = 30;
for (int i = 0; i < labels.length; i++){
buttons[i] = new JButton(labels[i]);
buttons[i].addActionListener(this);
buttons[i].addKeyListener(this);
buttons[i].setSize(50, 25);
buttons[i].setLocation(width, height);
pane.add(buttons[i]);

width +=55;
if (width >= 200) {
width = 5;
height +=30;
}
}
calculate = new JButton("=");
calculate.setSize(160, 25);
calculate.setLocation(5, 150);
calculate.addActionListener(this);
calculate.addKeyListener(this);
pane.add(calculate);

clear = new JButton("C");
clear.setSize(50, 25);
clear.setLocation(170, 150);
clear.addActionListener(this);
clear.addKeyListener(this);
pane.add(clear);


width = 241; height = 216;
setTitle("Java Calculator");
setSize(width, height);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setIconImage(new ImageIcon("icon.png").getImage());
setFocusable(true);
addKeyListener(this);
pane.setFocusable(true);
pane.addKeyListener(this);
reset();
}

public void actionPerformed (ActionEvent e){
if (e.getActionCommand().equals("+/-")) {
performAction('q');
} else {
performAction(e.getActionCommand().charAt(0));
}
}

public void performAction(char action){
try {
switch (action) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (isFirst){
output.setText(""+action);
isFirst = false;
} else {
buffer = output.getText();
output.setText(buffer+action);
}
break;
case 'q':
temp = Double.parseDouble(output.getText());
if (temp < 0) {
temp = Math.abs(temp);
} else if (temp > 0){
temp = -temp;
} else if (temp == 0){
}
output.setText(""+temp);
break;
case '.':
buffer = output.getText();
if (buffer.indexOf(".") < 0){
output.setText(buffer+".");
} else {
if (buffer.charAt(buffer.indexOf(".")+1) == '0')
output.setText(buffer.substring(0, (buffer.indexOf(".")+1)));
isFirst = false;
}
break;
case 'C':
reset();
break;
case '+':
case '-':
case '*':
case '/':
num1 = Double.parseDouble(output.getText());
operation = action;
isFirst = true;
break;
case '=':
num2 = Double.parseDouble(output.getText());
if (operation == '+') num1 += num2;
if (operation == '-') num1 -= num2;
if (operation == '*') num1 *= num2;
if (operation == '/') num1 /= num2;
if (operation == 'x') num1 = Double.parseDouble(output.getText());
reset (""+num1);
break;
}
} catch (ArithmeticException ae){
JOptionPane.showMessageDialog(null, "ERROR: An Unknown Exception Has Occured\n"+ae.getMessage(), "Exception Error", JOptionPane.INFORMATION_MESSAGE);
reset();
}catch (Exception ee){
JOptionPane.showMessageDialog(null, "ERROR: An Unknown Exception Has Occured\n"+ee.getMessage(), "Exception Error", JOptionPane.INFORMATION_MESSAGE);
reset();
}
}

public void reset(){
num1 = 0;
num2 = 0;
reset ("0.0");
}

public void reset(String init){
isFirst = true;
operation = 'x';
output.setText (init);
}

public void keyReleased(KeyEvent e){
}

public void keyTyped(KeyEvent e){
}

public void keyPressed (KeyEvent e){
//keyID = e.getID();
keyID = e.getKeyChar();
if (keyID == 97 || keyID == 49){
// 1
performAction('1');
} else if (keyID == 98 || keyID == 50){
// 2
performAction('2');
} else if (keyID == 99 || keyID == 51){
// 3
performAction('3');
} else if (keyID == 100 || keyID == 52){
// 4
performAction('4');
} else if (keyID == 101 || keyID == 53){
// 5
performAction('5');
} else if (keyID == 102 || keyID == 54){
// 6
performAction('6');
} else if (keyID == 103 || keyID == 55){
// 7
performAction('7');
} else if (keyID == 104 || keyID == 56){
// 8
performAction('8');
} else if (keyID == 105 || keyID == 57){
// 9
performAction('9');
} else if (keyID == 110 || keyID == 46){
// .
performAction('.');
} else if (keyID == 10){
// =
performAction('=');
} else if (keyID == 107 || keyID == 43){
// +
performAction('+');
} else if (keyID == 109 || keyID == 45){
// -
performAction('-');
} else if (keyID == 106 || keyID == 42){
// *
performAction('*');
} else if (keyID == 111 || keyID == 47){
// /
performAction('/');
} else if (keyID == 67 || keyID == 99){
// C
performAction('C');
} else if (keyID == 48){
// 0
performAction('0');
}
//JOptionPane.showMessageDialog(null, keyID+" Was Pressed", "Debug Information", JOptionPane.INFORMATION_MESSAGE);
}
}[/HIGHLIGHT]

But im going to re-write it, my code is not pretty at all....