Java while loop only loops once

I'm trying to make a turn-based snake thingy, but I just can't get it to work properly. I think something might be wrong with the run() method, because it only loops once if the if() statement doesn't activate. If I put repaint() after the if() statement, everything will work. But I was just wondering why the loop doesn't loop if I don't. Any ideas? :)

My code:

public class Class extends Applet implements KeyListener, Runnable {

private static final long serialVersionUID = 1L;

int p = 5;
int x[] = new int[p];
int y[] = new int [p];
int e;
int n;

public Class() {
    for (int i = 0; i < p; i++) {
        x[i] = 10 + i;
        y[i] = 10;
    }
    e = x[0];
    n = y[0];
    addKeyListener(this);
    new Thread(this).start();
}

public static void main(String[] args) {
    new Class();
}

public void keyPressed(KeyEvent e) {
    if (e.getKeyCode() == KeyEvent.VK_UP) {
        y[0]--;
    }
    if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
        x[0]++;
    }
    if (e.getKeyCode() == KeyEvent.VK_DOWN) {
        y[0]++;
    }
    if (e.getKeyCode() == KeyEvent.VK_LEFT) {
        x[0]--;
    }
}

public void keyReleased(KeyEvent e) {

}

public void keyTyped(KeyEvent e) {

}

public void run() {
    while (true) {
        if (x[0] != 10 || y[0] != 10) {
            for (int i = p - 1; i > 1; i--) {
                x[i] = x[i-1];
                y[i] = y[i-1];
            }
            x[1] = e;
            y[1] = n;
            e = x[0];
            n = y[0];
            repaint();
        }
    }
}

public void paint(Graphics g) {
    for (int i = 0; i < p; i++) {
        g.drawString(x[0] + ", " + y[0], 10, 10);
        g.fillRect(x[i] * 10, y[i] * 10, 10, 10);
    }
}
}

Please explain everything in a very simple way as I'm not very good at programming (yet). Good advice is also much appreciated. :)