Thread: Having trouble with Rectangle2d

Hello, Gravity Games here! Recently, I've been playing apps on my new Android Galaxy Player, and have been having a lot of fun, which motivated me to start developing android apps. Apparently, android apps are coded in Java, so I made the decision o finally move up from game maker and start using Java. I was following a YouTube tutorial in Java game coding, and everything was going swell, until I got to the point of rendering a rectangle. Here's the code I have in the file that's giving me trouble.

package main.cww.gravitygames;
 
import java.awt.Color;
import java.awt.Graphics;
import java.awt.geom.Rectangle2D;
 
import javax.swing.*;
 
public class Ac extends JPanel{
	public int characterWidth=12;
	public int characterHeight=20;
	public Rectangle character;
 
 
	public boolean objectsDefined=false;
 
	public Ac() {
		setBackground(Color.BLACK);
 
		defineObjects();
	}
    public void defineObjects() {
    	character = new Rectangle((Aa.width/2) - (characterWidth/2), (Aa.height/2) - (characterHeight/2), characterWidth, characterHeight);
 
    	objectsDefined=true;
    }
 
	public void paintComponent(Graphics g) {
        	super.paintComponent(g);
 
        	if(objectsDefined){
        		g.setColor(Color.WHITE);
        		g.fillRect(character.x, character.y, character.width, character.height);
        	}
        }
}

Help is REALLY appreciated, I've been trying 2 days to fix this but to no avail.

EDIT: ...okay? I had originally used Rectangle, but I changed it to Rectangle2d at the request of Eclipse, then I hover over Rectangle2d and it requests a change to Rectangle. When I tried running it again, it somehow worked... is it just me, or is Eclipse just weird sometimes?...