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    <p>Looking at your code, it seems you are doing it wrong. First of all don't write these lines</p> <pre><code>private JPanel panel1; private JPanel panel2; </code></pre> <p>instead write : </p> <pre><code>private A a = new A(); private B b = new B(a); </code></pre> <p>Since a and b, themselves are Panels now, as they extending JPanel class.</p> <p>So add this to your tabbedPane now : </p> <pre><code>jTabbedPane1.addTab("Tab 1", null, a/*This is your Panel1*/, "Just Panel"); jTabbedPane1.addTab("Tab 2", null, b/*This is your Panel2*/, "Button"); </code></pre> <p>Simply add a JPanel variable to your B class and change the constructor of your class B as follows : </p> <pre><code>JPanel panel1; public B(JPanel panel) { pane1 = panel; initComponents(); // make this method return void in it's definition, in both the classes. } </code></pre> <p>Now inside the actionPerformed() method do this :</p> <pre><code>jButton1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub panel1.setBackground(Color.RED); } }); </code></pre> <p>Here is small program modified from the previous submission, that resembles your case : </p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class TabbedPaneExample extends JPanel { private Panel1 panel1; private Panel2 panel2; public TabbedPaneExample() { super(new GridLayout(1, 1)); JTabbedPane tabbedPane = new JTabbedPane(); //panel1 = getPanel("Panel Number 1"); panel1 = new Panel1("Panel Number 1"); tabbedPane.addTab("Tab 1", null, panel1, "Just Panel"); tabbedPane.setMnemonicAt(0, KeyEvent.VK_1); //panel2 = getPanelWithButton("COLOR"); panel2 = new Panel2("COLOR", panel1); tabbedPane.addTab("Tab 2", null, panel2, "Button"); tabbedPane.setMnemonicAt(1, KeyEvent.VK_2); add(tabbedPane); tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT); } private static void createAndDisplayGUI() { JFrame frame = new JFrame("Tabbed Pane Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new TabbedPaneExample(), BorderLayout.CENTER); frame.pack(); frame.setVisible(true); } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndDisplayGUI(); } }); } } class Panel1 extends JPanel { public JLabel label; public Panel1(String text) { label = new JLabel(text); label.setHorizontalAlignment(JLabel.CENTER); setLayout(new GridLayout(1, 1)); setBackground(Color.RED); add(label); } } class Panel2 extends JPanel { public JButton button; public JPanel panel1; public Panel2(String text, JPanel panel) { panel1 = panel; button = new JButton(text); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { panel1.setBackground(Color.BLUE); } }); setLayout(new GridLayout(1, 1)); add(button); } } </code></pre> <p>Hope this will help you explain what you doing wrong.</p> <p>Here is the image of the program as it is started : </p> <p><img src="https://i.stack.imgur.com/2Aq9g.png" alt="AT START"></p> <p>Here is the image of the second tab with button : </p> <p><img src="https://i.stack.imgur.com/Jbdxv.png" alt="TAB WITH BUTTON ON IT"></p> <p>Here is the image of the first tab as you click on tab2's button to change tab1's background color to blue : </p> <p><img src="https://i.stack.imgur.com/DiidC.png" alt="BACKGROUND COLOR OF TAB1 CHANGED"></p> <p>Hope this might help you in your endeavour.</p> <p>Regards</p>
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