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    <p>The overall problem is a Swing Layout issue. Your mainPanel JPanel has a default layout, FlowLayout, that attempts to arrange each thing (Piece) that you add to it. Each Piece's paintComponent will only control painting itself, not on the overall mainPanel. So your Pieces are not being painted relative to the overall mainPanel.</p> <p>Something Like:</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Graphics; import java.util.ArrayList; import java.util.List; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; public class Tetris extends JFrame { public Tetris(String string) { super(string); } public static void main(String[] args) { Tetris tetris = new Tetris("Tetris"); tetris.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel mainPanel = new JPanel(); mainPanel.setLayout(new BorderLayout()); tetris.getContentPane().setLayout(new BorderLayout()); tetris.getContentPane().add(mainPanel, BorderLayout.CENTER); tetris.setLocationRelativeTo(null); tetris.pack(); tetris.setSize(500, 500); tetris.setResizable(false); tetris.setVisible(true); tetris.paintBoard(mainPanel); } public void paintBoard(JPanel mainPanel) { Piece p1 = new Piece(10,10,50,50,Color.GREEN); Piece p2 = new Piece(60,10,50,50,Color.RED); Board board = new Board(); board.addPiece(p1); board.addPiece(p2); mainPanel.add(board, BorderLayout.CENTER); } private class Board extends JComponent { private List&lt;Piece&gt; pieces = new ArrayList&lt;Piece&gt;(); public void addPiece(Piece piece) { pieces.add(piece); } @Override public void paintComponent(Graphics g) { for(Piece piece : pieces) { g.setColor(piece.c); g.drawRect(piece.X, piece.Y, piece.W, piece.H); g.fillRect(piece.X, piece.Y, piece.W, piece.H); } } } private class Piece { private int X = 0; private int Y = 0; private int H = 0; private int W = 0; private Color c; public Piece(int X, int Y, int W, int H, Color c) { this.X = X; this.Y = Y; this.W = W; this.H = H; this.c = c; } } } </code></pre>
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    1. POHow to paint rectangles adjacent in Swing?
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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