interfaz grafica

import javax.swing.*;
public class interfaz_grafica extends JFrame{
private JLabel label1;
private JLabel label2;
public interfaz_grafica(){
setLayout(null);
label1= new JLabel("HOLA");
label1.setBounds(500,400,200,200);
add(label2);
label2= new JLabel("bon dia");
label2.setBounds(400,300,200,300);
add(label1);
}
public static void main (String args[]){
interfaz_grafica interfaz_grafica1 = new interfaz_grafica();
interfaz_grafica1.setBounds(0,0,1000,800);
interfaz_grafica1.setVisible(true);
interfaz_grafica1.setLocationRelativeTo(null);
}
}