Getting the element of a vector in Java 2011

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Code:
private Vector<Integer> snakeX = new Vector<Integer> (5,2);
    private Vector<Integer> snakeY = new Vector<Integer> (5,2);
     
    public void startGraphics (){
    this.addKeyListener(this);
    repaint();
    snakeX.add(240);
    snakeY.add(240);
    snakeX.add(240);
    snakeY.add(230);
    snakeX.add(240);
    snakeY.add(220);
     
    }
     
    public void paintComponent (Graphics g){
    super.paintComponent (g);
     
    for (int x : snakeX){
    g.fillOval(x, snakeY.elementAt(snakeX.lastIndexOf (x)),10, 10);
    System.out.println ("x: " + x + "\t y: " + snakeY.elementAt(snakeX.lastIndexOf (x)));
    }
}