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copied!<p>I gave this a try (hope that's what you want).</p> <p>With all that links and tutorials already provided, you should have been able to do that (IMO).</p> <p>That's what it looks like:</p> <p><a href="http://img97.imageshack.us/img97/9557/socombobox.png" rel="nofollow noreferrer">Screenshot http://img97.imageshack.us/img97/9557/socombobox.png</a></p> <p>It does <strong>not</strong> do proper exception handling, does <strong>not</strong> round the results and is <strong>not</strong> really object oriented (just uses hardcoded indexes, be careful when changing).</p> <hr> <p>Add the components (called <code>txtInput</code>, <code>cmbChoose</code>, <code>btnDo</code> and <code>txtResult</code> in my case.</p> <p>Edit the <code>model</code> property of your <code>JComboBox</code>, using <code>Combo Box Model Editor</code> and set it to</p> <pre><code>x5 plus10 plus5perc </code></pre> <p>This will generate the following source:</p> <pre><code>cmbChoose.setModel(new javax.swing.DefaultComboBoxModel( new String[] { "x5", "plus10", "plus5perc" })); </code></pre> <p>Put the following into your <code>JButton</code>s <code>ActionPerformed</code> method.</p> <pre><code>try { float input = Float.valueOf(txtInput.getText()); float output = 0; switch (cmbChoose.getSelectedIndex()) { case 0: output = input * 5; break; case 1: output = input + 10; break; case 2: output = input * 1.05f; } txtResult.setText(String.valueOf(output)); } catch (Exception e) { txtResult.setText("[Error]"); } </code></pre>

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