URGENT HELP! NEED A HELPING HAND!

Question

is it possible to "listen keyboard" for web-applications and execute needed classes (programms) according to this keypresses?

Answer 1

Try this as an example:
//<applet code="TestitAppl.class" height=75 width=225> </applet>
import java.awt.*;
import java.awt.event.*;
public class TestitAppl extends java.applet.Applet implements KeyListener {
private int iDx, keyHit;
private char myChar;
private char[] calcEntr;
private String calcPrnt;
private TextField display;
private Panel p;
public void init() {
setBackground(Color.cyan);
calcEntr = new char[20];
setFont(new Font("Helvetica", Font.BOLD, 15));
setBackground(Color.white);
p = new Panel();
display = new TextField("Currently just this", 20);
p.setLayout(new GridLayout(1, 1, 10, 10));
display.setBackground(Color.white);
display.setForeground(Color.blue);
display.addKeyListener(this);
p.add(display);
add(p);
public void keyTyped(KeyEvent event) {
myChar = event.getKeyChar();
if (!java.lang.Character.isISOControl(myChar)) {
if (myChar != '.') {
if (iDx < calcEntr.length) { calcEntr[iDx++]=myChar; }
else { changeColor(); }
// KEYS: 8 is the BackSpace key, 9 is the Tab key, 10 is the Enter key
public void keyPressed(KeyEvent event) {
keyHit = event.getKeyCode();
if (keyHit == 8) {
if (iDx > 0) { calcEntr[--iDx] = ' '; }
else if (keyHit == 10) {
display.setText(new String(calcEntr));
for (int i=0; i<calcEntr.length;i++) { calcEntr[i]='\u0000'; }
calcPrnt="";
iDx=0;
else { clearDisplay(); }
public void keyReleased(KeyEvent event) { }
public void changeColor() {
int i = (int) (Math.random()*10)%9;
switch (i) {
case 1: { display.setForeground(Color.blue);   break; }
case 3: { display.setForeground(Color.gray);   break; }
case 5: { display.setForeground(Color.red);    break; }
case 7: { display.setForeground(Color.yellow); break; }
case 9: { display.setForeground(Color.cyan);   break; }
default: { display.setForeground(Color.black);  break; }
public void clearDisplay() { display.setText(""); }