89 lines
2.8 KiB
Java
89 lines
2.8 KiB
Java
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Using JRadioButton
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// Creating radio buttons using ButtonGroup and JRadioButton.
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class RadioButtonTest extends JFrame
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{
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private JTextField t;
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private Font plainFont, boldFont,
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italicFont, boldItalicFont;
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private JRadioButton plain, bold, italic, boldItalic;
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private ButtonGroup radioGroup;
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public RadioButtonTest()
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{
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super( "RadioButton Test" );
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Container c = getContentPane();
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c.setLayout( new FlowLayout() );
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t = new JTextField( "Watch the font style change", 25 );
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c.add( t );
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// Create radio buttons
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plain = new JRadioButton( "Plain", true );
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c.add( plain );
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bold = new JRadioButton( "Bold", false);
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c.add( bold );
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italic = new JRadioButton( "Italic", false );
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c.add( italic );
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boldItalic = new JRadioButton( "Bold/Italic", false );
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c.add( boldItalic );
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// register events
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RadioButtonHandler handler = new RadioButtonHandler();
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plain.addItemListener( handler );
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bold.addItemListener( handler );
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italic.addItemListener( handler );
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boldItalic.addItemListener( handler );
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// create logical relationship between JRadioButtons
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radioGroup = new ButtonGroup();
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radioGroup.add( plain );
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radioGroup.add( bold );
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radioGroup.add( italic );
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radioGroup.add( boldItalic );
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plainFont = new Font( "TimesRoman", Font.PLAIN, 14 );
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boldFont = new Font( "TimesRoman", Font.BOLD, 14 );
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italicFont = new Font( "TimesRoman", Font.ITALIC, 14 );
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boldItalicFont = new Font( "TimesRoman", Font.BOLD + Font.ITALIC, 14 );
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t.setFont( plainFont );
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setSize( 300, 100 );
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show();
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}
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public static void main( String args[] )
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{
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RadioButtonTest app = new RadioButtonTest();
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app.addWindowListener( new WindowAdapter()
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{
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public void windowClosing( WindowEvent e )
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{
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System.exit( 0 );
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}
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} );
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}
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private class RadioButtonHandler implements ItemListener
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{
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public void itemStateChanged( ItemEvent e )
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{
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if ( e.getSource() == plain )
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t.setFont( plainFont );
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else if ( e.getSource() == bold )
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t.setFont( boldFont );
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else if ( e.getSource() == italic )
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t.setFont( italicFont );
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else if ( e.getSource() == boldItalic )
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t.setFont( boldItalicFont );
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t.repaint();
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}
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}
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}
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