JRadioButtonSelectedElements.java Source code

Introduction

Here is the source code for JRadioButtonSelectedElements.java

Source

import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import java.util.Vector;

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

public class JRadioButtonSelectedElements {
    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);

        System.out.println(getSelectedElements(panel).hasMoreElements());
    }

    public static Enumeration<String> getSelectedElements(Container container) {
        Vector<String> selections = new Vector<String>();
        Component components[] = container.getComponents();
        for (int i = 0, n = components.length; i < n; i++) {
            if (components[i] instanceof AbstractButton) {
                AbstractButton button = (AbstractButton) components[i];
                if (button.isSelected()) {
                    selections.addElement(button.getText());
                }
            }
        }
        return selections.elements();
    }

}