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PO
 

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    <p>Not entirely sure what you mean by "one pixel off" - but achieve zero intercell spacing without any visual artefacts you have to both zero the margins and turn off the grid lines:</p> <pre><code>table.setIntercellSpacing(new Dimension(0, 0)); table.setShowGrid(false) </code></pre> <p><strong>Edit</strong></p> <p>Okay, looking closer, there are several issues with your code</p> <ul> <li>you do the column sizing indirectly instead of directly (and yet another nice example why to never-ever do a component.setPreferredSize :-)</li> <li>the renderer's border takes some size</li> </ul> <p>to fix the first, configure each <em>column</em>'s width, table layout will automagically configure its itself</p> <pre><code> final int rows = 16; final int columns = 16; Tile tile = new Tile(0); int tileHeight = tile.getIcon().getIconHeight(); int tileWidth = tile.getIcon().getIconWidth(); JTable table = new JTable(rows, columns); // remove all margin table.setIntercellSpacing(new Dimension(0, 0)); table.setShowGrid(false); table.setTableHeader(null); // set the rowHeight table.setRowHeight(tileHeight); // turn off auto-resize table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); // configure each column with renderer and prefWidth for (int j = 0; j &lt; columns; j++) { TableColumn column = table.getColumnModel().getColumn(j); column.setCellRenderer(new MyRenderer()); column.setPreferredWidth(tileWidth); } </code></pre> <p>for the second, null the border in each call:</p> <pre><code>public static class MyRenderer extends DefaultTableCellRenderer { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); setBorder(null); Tile tile = (Tile) value; setIcon(tile.getIcon()); return this; } } </code></pre>
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    1. COSorry, somehow missed the table.setShowGrid(false) line when I was copying over. Edited to include it.
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    2. COAwesome, thanks! This did exactly what I needed. Also, thanks for the heads-up about setPreferredSize(); nobody's ever told me this before, but a quick look at [jGuru](http://www.jguru.com/faq/view.jsp?EID=237070) gave me decent overview of why it's a bad idea.
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