How to create on click event for buttons in swing?

Question

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?

Answer 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();

Answer 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());             }         });     } }