[hardwired]

Code:

public class ShuffleBoard extends JFrame {
    // If Board is a model class and not part
    // of the componeent hierarchy.
    Board board = new Board("Shuffleboard");
    BoardCanvas boardCanvas;

    ShuffleTest() {
        boardCanvas = new BoardCanvas();
        this.add(boardCanvas);
        board.seLocation(100, 100);
        board.setResizable(false);
        board.setVisible(true);
    }
}

class Board {
    // This could be some kind of model class.
    // If so you may not need a reference to
    // it in the ShuffleBoard class.
    // If it is designed as part of the component
    // hierarchy see below.
}

class BoardCanvas extends JPanel {

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.black);
        for (Weight w : weights) {
            g.fillOval(200, 200, 50, 50);
//            g.drawString("Test", 100, 100);
            System.out.println("Bleh");
        }
    }
}

If Board is part of the component hierarchy:

Code:

public class ShuffleTest extends JFrame {
    Board board = new Board("Shuffleboard");

    ShuffleTest() {
        this.add(board);
        board.seLocation(100, 100);
        board.setResizable(false);
        board.setVisible(true);
    }
}

class Board extends Some_JComponent {
    BoardCanvas boardCanvas;

    Board() {
        boardCanvas = new BoardCanvas();
        this.add(boardCanvas);
    }   
}