import java.awt.*;
import java.awt.event.*;
	public class RadioButton{
	public static void main(String[] args) {
		Frame fm=new Frame("RedioButton Group");
		Label la=new Label("What is your choice:");
		fm.setLayout(new GridLayout(0, 1));
		CheckboxGroup cg1=new CheckboxGroup();
		fm.add(la);
		fm.add(new Checkbox("MATH", cg1, true));
		fm.add(new Checkbox("PHYSICS", cg1, false));
		fm.add(new Checkbox("CHEMISTRY", cg1, false));
		fm.add(new Checkbox("ENGLISH", cg1, false));
		fm.setSize(250,200);
		fm.setVisible(true);
		fm.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent we){
				System.exit(0);
			}
		});
	}
}