My task is to retrieve the value of a text field and display it in an alert box when clicking a button. How do I generate the on click event for a button in Java Swing?

3 Answers

For that, you need to use ActionListener, for example:

JButton b = new JButton("push me");
b.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //your actions }
});

For generating click event programmatically, you can use doClick() method of JButton: b.doClick();

2

First, use a button, assign an ActionListener to it, in which you use JOptionPane to show the message.

class MyWindow extends JFrame { public static void main(String[] args) { final JTextBox textBox = new JTextBox("some text here"); JButton button = new JButton("Click!"); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(this, textBox.getText()); } }); }
}

1

You can also use lambda-function:

JButton button = new JButton("click me");
button.addActionListener(e ->
{ // your code here
});

However, if you mean signals and slots like in Qt, then Swing does not support this. But you can always implement this yourself using the "Observer" pattern (link).

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