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    <p>Initialize two <code>boolean</code> variables <code>aClicked</code> and <code>bClicked</code> to <code>false</code>.</p> <p>When the user clicks the button in class A, set <code>aClicked</code> to <code>true</code>. Then perform the following logic:</p> <pre><code>if (aClicked &amp;&amp; bClicked) { new ClassC(); } aClicked = false; bClicked = false; </code></pre> <p>When the user clicks the button in class B, set <code>bClicked</code> to <code>true</code>. Then perform the same logic.</p> <p>I'd need more details for a better answer.</p> <p>EDIT: Given your code sample and using anonymous classes, I wrote the following. I don't normally write GUI's in Java, and when I do, it's with WindowBuilder. Point being this probably isn't thread-safe and may not clean up resources properly, but the point is to demonstarte the concept of referencing the <code>boolean</code> variables from within an anonymous class using the <code>final</code> keyword.</p> <p>This worked for me. If it doesn't help you, I'll need more of your code.</p> <p>Also, for the <code>State</code> class, if your logic gets more complicated, I would recommend the FSM approach recommended by Jake Greene.</p> <pre><code>import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextArea; public class Main { public static void main(String[] args) { final State state = new State(); final JTextArea textArea = new JTextArea(1, 10); textArea.setEditable(false); JButton buttonA = new JButton("Button A"); buttonA.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { state.clickA(); if (state.bothClicked()) { textArea.setText("both clicked."); } } }); JButton buttonB = new JButton("Button B"); buttonB.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { state.clickB(); if (state.bothClicked()) { textArea.setText("both clicked."); } } }); JButton reset = new JButton("Reset!"); reset.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { state.reset(); textArea.setText(""); } }); JPanel pane = new JPanel(); pane.add(buttonA); pane.add(buttonB); pane.add(textArea); pane.add(reset); JFrame frame = new JFrame(); frame.setContentPane(pane); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } } class State { private boolean aClicked; private boolean bClicked; public void clickA() { this.aClicked = true; } public void reset() { this.aClicked = false; this.bClicked = false; } public void clickB() { this.bClicked = true; } public boolean bothClicked() { return this.aClicked &amp;&amp; this.bClicked; } } </code></pre>
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    1. COThanks,Below is the event code but how do I go about changing the click event to a boolean. buttonpanel = new JPanel(); getItButton = new JButton("Call ThirdClass"); getItButton.addActionListener (new ActionListener() { public void actionPerformed (ActionEvent evt) { textarea.append("Calling thirdclass...\n"); String result = thirdclass.fetch_message(); textarea.append(" Result = " + result + "\n\n"); } }); // There is a text area showing when it is clicked and when it get a response back from the thirdclass
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