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POUse a absolute layout inside a JScrollPane
 

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    <p>I need to use a JScrollPane with absolute layoute. I know that the use of setLayout(null) is not recommendable at all. I've been reading that if you want to use the absolute layout with a JScrollPane it is necessary to set the preferred size property of the elements inside in order to JScrollPane can calculate its size.</p> <p>I've been trying the next code changing the order and sizes of elemnts but I can't work out where I've been wrong.</p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; public class frame extends JFrame { private JPanel contentPane; private JScrollPane scrollPane; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { frame frame = new frame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public frame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setLayout(null); setContentPane(contentPane); JPanel panel = new JPanel(); panel.setBackground(Color.red); panel.setBounds(0,0,600,600); panel.setPreferredSize(new Dimension(420,280)); scrollPane = new JScrollPane(panel); scrollPane.setBounds(0, 0, 600, 600); scrollPane.setLayout(null); scrollPane.setBackground(Color.green); scrollPane.add(panel); scrollPane.setPreferredSize(new Dimension(450,300)); contentPane.add(scrollPane); } } </code></pre> <p>Why setPreferredSize is not doing the right work? Thanks in advance.</p>
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    1. COSee also [`ScrollPanePaint`](http://stackoverflow.com/a/10097538/230513).
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    2. COa) never-ever use a null Layout (aka: no LayoutManager) b) never-ever use setXXSize
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