call method from a method within the same class - methods

Question

I have a platformer class that creates a window and spawns platforms and a "character". It uses another class platform to make platforms. The character is supposed to jump up and land on the platforms. I use the getBounds and getTopY functions for collision detection but they only work for the first platform. How can i get them to work for multiple platforms?
public class Platformer extends JPanel {
Platform platform = new Platform(this);
Character character = new Character(this);
public Platformer() {
addKeyListener(new KeyListener() {
#Override
public void keyTyped(KeyEvent e) {
character.keyTyped(e);
}
#Override
public void keyReleased(KeyEvent e) {
character.keyReleased(e);
}
#Override
public void keyPressed(KeyEvent e) {
character.keyPressed(e);
}
});
setFocusable(true);
}
#Override
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
platform.Location(150,200);
platform.paint(g2d);
platform.Location(200,120);
platform.paint(g2d);
character.paint(g2d);
}
private void move(){
character.move();
}
public static void main(String args[]){
JFrame frame = new JFrame("Mini Tennis");
//create new game
Platformer platformer = new Platformer();
//add game
frame.add(platformer);
//size
frame.setSize(400, 400);
frame.setVisible(true);
//set close condition
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
while (true) {
platformer.move();
platformer.repaint();
try {
Thread.sleep(10);//sleep for 10 sec
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
}
public class Platform {
private static final int Height = 10;
private static final int Width = 60;
int x;
int Y;
private Platformer platformer;
public Platform(Platformer platformer) {
this.platformer = platformer;
}
public void Location(int xin, int yin) {
x = xin;
Y = yin;
}
public void paint(Graphics2D g) {
g.fillRect(x, Y, Width, Height);
}
public Rectangle getBounds() {
return new Rectangle(x, Y, Width, Height);
}
public int getTopPlat() {
return Y;
}
}

Answer 1

Actually you have only one platform. And you draw this platform twice in different places (paint function in Platformer):
platform.Location(150,200);
platform.paint(g2d);
platform.Location(200,120);
platform.paint(g2d);
Therefore I suppose you handle only one platform (with coordinates 200 and 120). You must keep all of your platforms and handle each of them separately.