90 lines
2.3 KiB
Java
90 lines
2.3 KiB
Java
import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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/**
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* @version 1.33 2007-06-12
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* @author Cay Horstmann
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*/
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public class RadioButtonTest
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{
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public static void main(String[] args)
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{
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EventQueue.invokeLater(new Runnable()
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{
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public void run()
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{
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RadioButtonFrame frame = new RadioButtonFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);
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}
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});
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}
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}
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/**
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* A frame with a sample text label and radio buttons for selecting font sizes.
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*/
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class RadioButtonFrame extends JFrame
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{
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public RadioButtonFrame()
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{
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setTitle("RadioButtonTest");
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setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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// add the sample text label
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label = new JLabel("The quick brown fox jumps over the lazy dog.");
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label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
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add(label, BorderLayout.CENTER);
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// add the radio buttons
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buttonPanel = new JPanel();
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group = new ButtonGroup();
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addRadioButton("Small", 8);
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addRadioButton("Medium", 12);
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addRadioButton("Large", 18);
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addRadioButton("Extra large", 36);
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add(buttonPanel, BorderLayout.SOUTH);
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}
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/**
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* Adds a radio button that sets the font size of the sample text.
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* @param name the string to appear on the button
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* @param size the font size that this button sets
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*/
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public void addRadioButton(String name, final int size)
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{
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boolean selected = size == DEFAULT_SIZE;
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JRadioButton button = new JRadioButton(name, selected);
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group.add(button);
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buttonPanel.add(button);
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// this listener sets the label font size
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ActionListener listener = new ActionListener()
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{
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public void actionPerformed(ActionEvent event)
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{
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// size refers to the final parameter of the addRadioButton
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// method
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label.setFont(new Font("Serif", Font.PLAIN, size));
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}
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};
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button.addActionListener(listener);
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}
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public static final int DEFAULT_WIDTH = 400;
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public static final int DEFAULT_HEIGHT = 200;
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private JPanel buttonPanel;
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private ButtonGroup group;
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private JLabel label;
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private static final int DEFAULT_SIZE = 12;
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}
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