Graphical Application @ Java

main.java

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class main extends JFrame {

    JPanel panel;
    JLabel msg;

      public main()
    {
        super("JAVA SWING, AWT");
    }

    public void criaJanela()
    {
        panel = new JPanel();
        msg = new JLabel("Testando aplicação gráfica com Java");

        panel.add(msg);
        panel.setSize(500,500);

        getContentPane().add(panel, BorderLayout.CENTER);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        pack();
        setVisible(true);
    }

    public static void main(String[] args) {

 	main Frame = new main();
        Frame.criaJanela();
    }
}