program does not enter for loop in Java 2011

Code:
    import javax.swing.*;
    import java.awt.event.*;
    import java.awt.*;
    import java.util.*;
     
    public class SnakeG extends JPanel implements KeyListener, Runnable{
     
    private Vector<Point> snake = new Vector<Point> (5,2);
     
    private Vector<Rectangle> snakeRectangle = new Vector<Rectangle> (5,2);
     
    public void startGraphics (){
     
    this.addKeyListener(this);
    Thread thread = new Thread (this);
     
    repaint();
    grabFocus();
    snake.add (new Point (250,250));
    snake.add(new Point (250,240));
    snake.add(new Point (250,230));
    addBall();
    thread.start();
    }
     
    private void addBall() {
    // TODO Auto-generated method stub
     
    }
     
     
     
    public void paintComponent (Graphics g){
    //TODO GRAPHICS AREA
    super.paintComponent (g);
     
    for (Point x : snake){
    g.fillOval((int)x.getX(),(int)x.getY(),10, 10);
     
    }
    }
     
     
     
     
    private boolean pressed = false;
    private boolean up,down,left,right;
    @Override
    public void keyPressed(KeyEvent e) {
    System.out.println ("KeyListener");
    int key = e.getKeyCode();
     
    up = false;
    down = false;
    left = false;
    right = false;
    if (key == KeyEvent.VK_UP && pressed == false){
    up = true;
    }
    else if (key == KeyEvent.VK_DOWN && pressed == false){
    down = true;
    }
    else if (key == KeyEvent.VK_LEFT && pressed == false){
    left = true;
    }
    else if (key == KeyEvent.VK_RIGHT && pressed == false){
    right = true;
    }
    pressed = true;
    }
     
    @Override
    public void keyReleased(KeyEvent e) {
    pressed = false;
    }
     
    @Override
    public void keyTyped(KeyEvent e){}
     
    @Override
    public void run() {
    // TODO Auto-generated method stub
    System.out.println ("Started Thread");
    while (true){
    if (up == true){
    for (int i = snake.size(); i < 0; i--){
    System.out.println ("Entered loop");
    if (i == 0){
    snake.firstElement().y -= 10;
    }
    else {
    snake.elementAt(i).y = snake.elementAt(i-1).y;
    }
    snake.elementAt(i);
    }
     
    }
    else if (down == true){
     
     
    }
    else if (left == true){
    for (int i = snake.size(); i < 0; i--){
    if (i == 0){
    snake.firstElement().x -= 10;
    }
    else {
    snake.elementAt(i).x = snake.elementAt(i-1).x;
    }
    }
     
    }
    else if (right == true){
     
     
    }
     
    repaint();
    try {
    Thread.sleep(500);
    } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    }
    }
    }
     
    }


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