StackOverflow2013

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copied!<ul> <li><p><code>this.setVisible(true)</code> must be last code line in the GUI constructor</p></li> <li><p>use <a href="http://java.about.com/od/javasyntax/a/nameconventions.htm" rel="noreferrer">Using Java Naming Conventions</a> correctly then <code>Panel1</code> should be <code>panel1</code> e.i.</p></li> <li><p>don't extends <code>JFrame</code> or <code>JApplet</code>, create that as local variable with the same way as for <code>Panel1</code></p></li> <li><p>don't use <code>NullLayout</code>, use proper <code>LayoutManager</code> instead, in this case <code>GridLayout</code> probably, otherwise <code>JFrames</code> contents isn't resiziable with <code>JFrame</code></p></li> </ul> <p><img src="https://i.stack.imgur.com/ehyVP.jpg" alt="enter image description here"></p> <p>code</p> <pre><code>import java.awt.*; import javax.swing.*; public class ColorongPanels { private JFrame frame = new JFrame("ColorongPanels"); private JPanel panel1 = new JPanel(); private JPanel panel2 = new JPanel(); private JPanel panel3 = new JPanel(); private JPanel panel4 = new JPanel(); private JLabel label1 = new JLabel("Label1"); private JLabel label2 = new JLabel("Label2"); private JLabel label3 = new JLabel("Label3"); private JLabel label4 = new JLabel("Label4"); public ColorongPanels() { frame.setLayout(new GridLayout(2, 2, 5, 5)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); panel1.setBackground(Color.red); panel1.setLayout(new BorderLayout()); panel1.add(label1, BorderLayout.CENTER); panel2.setBackground(Color.yellow); panel2.setLayout(new BorderLayout()); panel2.add(label2, BorderLayout.CENTER); panel3.setBackground(Color.black); panel3.setLayout(new BorderLayout()); panel3.add(label3, BorderLayout.CENTER); panel4.setBackground(Color.pink); panel4.setLayout(new BorderLayout()); panel4.add(label4, BorderLayout.CENTER); frame.add(panel1); frame.add(panel2); frame.add(panel3); frame.add(panel4); frame.setLocationRelativeTo(null); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new ColorongPanels(); } }); } } </code></pre>

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