Clase Ventana_Principal

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package ejercicioinscripciones;

import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;

public class Ventana_Principal extends JFrame {

    public Ventana_Principal() {
        super.setLayout(new FlowLayout());
        super.setBounds(500, 500, 200, 200);
        super.setVisible(true);
        super.setDefaultCloseOperation(EXIT_ON_CLOSE);
        super.add(botonAdministrador);
        super.add(botonEstudiante);
        super.setLocationRelativeTo(null);
        super.setResizable(false);

    }
    JButton botonAdministrador = new JButton("Administrador");
    JButton botonEstudiante = new JButton("Estudiante");

}