How can i pass a parameter into paintComponent()?

Question

public void paintComponent(Graphics g)
Graphics2D g2 = (Graphics2D) g;
          for(int i = 150;i<=250;i+=20)
               for(int a = 50;a<=200;a+=50)
          Rectangle box = new Rectangle(i, a, 15, 15);
g2.draw(box);
this is my paintComponent method. as far as i'm concerned, all our codings for drawing must be inside this method rite? My assignment is to create something like a cinema ticket system where we will display all the seats then user enters a position then we mark it. when i prompt the user for the position..how do i pass it into this method? pls help me. obviously the coding to prompt is in another .java file.

Answer 1

//this is my main
public class AirAsia extends JComponent {
          static JLabel input, input2;
     private static void test(){
          JFrame frame = new JFrame("Aeroplane Seating");
          frame.setSize(500,500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
          String prompt = JOptionPane.showInputDialog("Enter x");
     input = new JLabel("You have entered " +prompt);     
String prompt 2= JOptionPane.showInputDialog("Enter x");
     input 2= new JLabel("You have entered " +prompt2);     
          RectangleComponent component = new RectangleComponent();
frame.add(component);
          frame.setVisible(true);
private static void createAndShowGUI()
     JFrame.setDefaultLookAndFeelDecorated(true);
          test();
public static void main(String[] args)
createAndShowGUI();
//now this is my paint component in another file
public class RectangleComponent extends JComponent
public void paintComponent(Graphics g)
Graphics2D g2 = (Graphics2D) g;
          for(int i = 150;i<=250;i+=20)
               for(int a = 50;a<=200;a+=50)
          Rectangle box = new Rectangle(i, a, 15, 15);
g2.draw(box);}
          for(int i = 60;i<=160;i+=20)
               for(int a = 240;a<=820;a+=15)
          Rectangle box = new Rectangle(i, a, 15, 15);
g2.draw(box);
first of all, i ask the user to enter 2 inputs which are x and y. so now how do i pass in the x and y into paint component method so i can mark/draw the box?