Java_21_Radio_Button_Test_1/Radio_Button_Test_1.java at main · MSH-trojan/Java_21_Radio_Button_Test_1 · GitHub

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// Creating radio buttons using ButtonGroup and JRadioButton.

package Radio_Button_Test_1;

// Java core packages
import java.awt.*;
import java.awt.event.*;

// Java extension packages
import javax.swing.*;

public class Radio_Button_Test_1 extends JFrame {
   private JTextField field;
   private Font plainFont, boldFont, italicFont, boldItalicFont;
   private JRadioButton plainButton, boldButton, italicButton, boldItalicButton;
   private ButtonGroup radioGroup;

   // create GUI and fonts
   public Radio_Button_Test_1() {
      super("RadioButton Test");

      // get content pane and set its layout
      Container container = getContentPane();
      container.setLayout(new FlowLayout());

      // set up JTextField
      field = new JTextField("Watch the font style change", 25);
      container.add(field);

      // create radio buttons
      plainButton = new JRadioButton("Plain", true);
      container.add(plainButton);
      boldButton = new JRadioButton("Bold", false);
      container.add(boldButton);

      italicButton = new JRadioButton("Italic", false);
      container.add(italicButton);

      boldItalicButton = new JRadioButton("Bold/Italic", false);
      container.add(boldItalicButton);

      // register events for JRadioButtons
      RadioButtonHandler handler = new RadioButtonHandler();
      plainButton.addItemListener(handler);
      boldButton.addItemListener(handler);
      italicButton.addItemListener(handler);
      boldItalicButton.addItemListener(handler);

      // create logical relationship between JRadioButtons
      radioGroup = new ButtonGroup();
      radioGroup.add(plainButton);
      radioGroup.add(boldButton);
      radioGroup.add(italicButton);
      radioGroup.add(boldItalicButton);

      // create font objects
      plainFont = new Font("Serif", Font.PLAIN, 14);
      boldFont = new Font("Serif", Font.BOLD, 14);
      italicFont = new Font("Serif", Font.ITALIC, 14);
      boldItalicFont = new Font("Serif", Font.BOLD + Font.ITALIC, 14);
      field.setFont(plainFont);

      setSize(300, 100);
      setVisible(true);
   }

   // execute application
   public static void main(String args[]) {
      Radio_Button_Test_1 application = new Radio_Button_Test_1();
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }

   // private inner class to handle radio button events
   private class RadioButtonHandler implements ItemListener {
      // handle radio button events
      public void itemStateChanged(ItemEvent event) {
         // user clicked plainButton
         if (event.getSource() == plainButton)
            field.setFont(plainFont);

         // user clicked boldButton
         else if (event.getSource() == boldButton)
            field.setFont(boldFont);

         // user clicked italicButton
         else if (event.getSource() == italicButton)
            field.setFont(italicFont);

         // user clicked boldItalicButton
         else if (event.getSource() == boldItalicButton)
            field.setFont(boldItalicFont);
      }
   }
}