How to create on click event for buttons in swing?

问题

My task is to retrieve a value of text field and display it in a alert box when clicking on the button. how to generate the on click event for button in java swing ?

回答1:

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();

回答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());
            }
        });
    }
}

来源：https://stackoverflow.com/questions/21879243/how-to-create-on-click-event-for-buttons-in-swing