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POMark the duplicates in a JTable
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  1. POMark the duplicates in a JTable
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    copied!<p>I have created a <code>JTable</code> with the help of <code>AbstractTableModel</code>. I would like to mark (change the color of the cell) in a this <code>JTable</code> the third column which has the same entry as the second column. For example:</p> <p><img src="https://i.stack.imgur.com/OhaTr.png" alt="enter image description here"></p> <p>and so, with the help of this post <a href="https://stackoverflow.com/questions/13565703/check-duplicate-data-in-jtable-before-proceeding">Check duplicate data in jtable before proceeding</a></p> <p>I have came to this: </p> <pre><code> table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); TreeSet&lt;Object&gt; set = new TreeSet&lt;Object&gt;(); for (int i=0; i&lt;model.getRowCount();i++){ Object obj = model.getValueAt(i,1); //(row, column) if(!set.add(obj)) { c.setBackground(new java.awt.Color(255, 72, 72)); } else{ c.setBackground(null); } } return c; } }); </code></pre> <p>But, although it seems that it correctly checks for each row (due to some printing I have done), nothing is colored. I would like to add, that the <code>JTable</code> that I have created is a <code>JTable</code> that always changes, meaning there are two buttons, for <code>PREVIOUS</code> and <code>NEXT</code>and this table always changes each form - also the number of the columns changes.</p> <p>If anything more is requested, I would edit my post.</p> <p>Thank you.</p>
 

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