Add JRadioButton to a group and set selected to one of them in Java
Description
The following code shows how to add JRadioButton to a group and set selected to one of them.
Example
import java.awt.FlowLayout;
//from w w w.jav a2s .c o m
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame("JRadioButton Test");
frame.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JRadioButton button1 = new JRadioButton("Red");
JRadioButton button2 = new JRadioButton("Green");
JRadioButton button3 = new JRadioButton("Blue");
ButtonGroup colorButtonGroup = new ButtonGroup();
colorButtonGroup.add(button1);
colorButtonGroup.add(button2);
colorButtonGroup.add(button3);
button1.setSelected(true);
frame.add(new JLabel("Color:"));
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.pack();
frame.setVisible(true);
}
}
The code above generates the following result.
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