Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class Main {
    public static void main(String args[]) {
        JFrame frame = new JFrame("Grouping Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel(new GridLayout(0, 1));

        ButtonGroup group = new ButtonGroup();
        JRadioButton aRadioButton = new JRadioButton("A");
        JRadioButton bRadioButton = new JRadioButton("B");

        ActionListener crustActionListener = new ActionListener() {
            String lastSelected;

            public void actionPerformed(ActionEvent actionEvent) {
                AbstractButton aButton = (AbstractButton) actionEvent.getSource();
                String label = aButton.getText();
                String msgStart;
                if (label.equals(lastSelected)) {
                    msgStart = "Reselected: ";
                } else {
                    msgStart = "Selected: ";
                }
                lastSelected = label;
                System.out.println(msgStart + label);
            }
        };

        panel.add(aRadioButton);
        group.add(aRadioButton);
        panel.add(bRadioButton);
        group.add(bRadioButton);

        aRadioButton.addActionListener(crustActionListener);
        bRadioButton.addActionListener(crustActionListener);

        frame.add(panel);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}