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/*

* @Author: your name

* @Date: 2020-11-04 10:19:14

* @LastEditTime: 2020-11-04 10:28:50

* @LastEditors: Please set LastEditors

* @Description: In User Settings Edit

* @FilePath: /java/calcu/RadioButtonFrame.java

*/

package calcu;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class RadioButtonFrame extends JFrame {

private JPanel buttonPanel;

private ButtonGroup group;

private JLabel label;

private static final int DEFAULT_SIZE = 36;

public static void main(String[] args) {

RadioButtonFrame t = new RadioButtonFrame();

t.setTitle("ImageTest");

t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

t.setVisible(true);

}

public RadioButtonFrame() {

label = new JLabel("The quick brown fox jumps over the lazy dog.");

label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));

add(label, BorderLayout.CENTER);

// add the radio buttons

buttonPanel = new JPanel();

group = new ButtonGroup();

addRadioButton("Small", 8);

addRadioButton("Medium", 12);

addRadioButton("Large", 18);

addRadioButton("Extra large", 36);

add(buttonPanel, BorderLayout.SOUTH);

pack();

}

public void addRadioButton(String name, int size) {

boolean selected = size == DEFAULT_SIZE;

JRadioButton button = new JRadioButton(name, selected);

group.add(button);

buttonPanel.add(button);

// this listener sets the label font size

ActionListener listener = event -> label.setFont(new Font("Serif", Font.PLAIN, size));

button.addActionListener(listener);

}

}

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