1.

import javax.swing.*;
import java.awt.*;

public class Test {
	public static void main(String[] args) {
		JFrame fenetre = new JFrame();

		fenetre.setSize(500,500);
		fenetre.setLocation(100,100);
		fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		GridLayout layout = new GridLayout(4,1);
		fenetre.setLayout(layout);

		fenetre.add(new JRadioButton("Gryffondor"));
		fenetre.add(new JRadioButton("Serpentard"));
		fenetre.add(new JRadioButton("Serdaigle"));
		fenetre.add(new JRadioButton("Poufsouffle"));

		fenetre.setVisible(true);

	}
}

2.