单选按钮组件

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package radioButton;import javax.swing.*;import java.awt.*;/** * Created by End on 16/1/14. */public class RadioButtonTest {    public static void main (String args[]){        EventQueue.invokeLater(new Runnable() {            @Override            public void run() {                JFrame frame = new RadioButtonFrame();                frame.setTitle("Calculator");                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                frame.setVisible(true);            }        });    }}

package radioButton;import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;/** * Created by End on 16/1/14. */public class RadioButtonFrame extends JFrame {    private JPanel buttonPanel ;    private ButtonGroup group;    private JLabel label;    private static final int DEFAULT_SIZE = 36 ;    public RadioButtonFrame(){        label = new JLabel("I'm too said!");        label.setFont(new Font("Serif",Font.PLAIN,DEFAULT_SIZE));        add(label,BorderLayout.CENTER);        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, final int size){        boolean selected = size == DEFAULT_SIZE ;        JRadioButton button = new JRadioButton(name , selected);        group.add(button);        buttonPanel.add(button);        ActionListener listener = new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                label.setFont(new Font("Serif",Font.PLAIN,size));            }        };        button.addActionListener(listener);    }}

选择字体大小

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