how to define action listener for buttons in java

Question

I have a jframe that includes JButton.I have six buttons in this frame, but I don\'t know how to define action listener for this buttons.please help to solve this probl

Answer 1

Have a look at the Java tutorials on how to use ActionListeners:

https://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html

Here's a simple example:

    import java.awt.BorderLayout;
    import java.awt.Dimension;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    import javax.swing.JButton;
    import javax.swing.JComponent;
    import javax.swing.JFrame;
    import javax.swing.JPanel;

    public class Hello extends JPanel implements ActionListener {

        JButton button;

        public Hello() {

            super(new BorderLayout());
            button = new JButton("Say Hello");
            button.setPreferredSize(new Dimension(180, 80));
            add(button, BorderLayout.CENTER);

            button.addActionListener(this);  //  This is how you add the listener
        }

        /**
        * Invoked when an action occurs.
        */
        public void actionPerformed(ActionEvent e) {
            System.out.println("Hello world!");
        }


        private static void createAndShowGUI() {

            JFrame frame = new JFrame("Hello");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            JComponent newContentPane = new Hello();

            newContentPane.setOpaque(true);
            frame.setContentPane(newContentPane);
            frame.pack();
            frame.setVisible(true);
        }

        public static void main(String[] args) {
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    createAndShowGUI();
                }
            });
        }
    }