Java_21_Check_Box_Test_1/CheckBoxTest.java at main · MSH-trojan/Java_21_Check_Box_Test_1 · GitHub

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package check_box_test_1;

// CheckBoxTest.java
// Creating Checkbox buttons.

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

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

public class CheckBoxTest extends JFrame {
 private JTextField field;
 private JCheckBox bold, italic;

 // set up GUI
 public CheckBoxTest()
 {
    super( "JCheckBox Test" );

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

    // set up JTextField and set its font
    field =
       new JTextField( "Watch the font style change", 20 );
    field.setFont( new Font( "Serif", Font.PLAIN, 14 ) );
    container.add( field );

    // create checkbox objects
   bold = new JCheckBox( "Bold" );
   container.add( bold );

    italic = new JCheckBox( "Italic" );
    container.add( italic );

    // register listeners for JCheckBoxes
    CheckBoxHandler handler = new CheckBoxHandler();
    bold.addItemListener( handler );
    italic.addItemListener( handler );

    setSize( 275, 100 );
    setVisible( true );
 }

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

 // private inner class for ItemListener event handling
 private class CheckBoxHandler implements ItemListener {
    private int valBold = Font.PLAIN;
    private int valItalic = Font.PLAIN;

    // respond to checkbox events
    public void itemStateChanged( ItemEvent event )
    {
       // process bold checkbox events
       if ( event.getSource() == bold )

          if ( event.getStateChange() == ItemEvent.SELECTED )
             valBold = Font.BOLD;
          else
             valBold = Font.PLAIN;
        // process italic checkbox events
       if ( event.getSource() == italic )

          if ( event.getStateChange() == ItemEvent.SELECTED )
             valItalic = Font.ITALIC;
          else
             valItalic = Font.PLAIN;

       // set text field font
      field.setFont(
          new Font( "Serif", valBold + valItalic, 14 ) );
    }

 }  // end private inner class CheckBoxHandler

}  // end class CheckBoxTest