Coding Java SE Di Ubuntu 12.04 LTS

hari ini sedang mengerjakan coding Java yg terdiri atas tiga buah file class. isi coding file class pertama:

/*

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 */

package GUI2;

/**

 *

 * @author steven

 */

import java.awt.*;

import javax.swing.*;

public class Tampilan2 {

    public static void main (String[] args){

       

        WindowUtilities.setNativeLookAndFeel();

        JFrame f = new JFrame("Ini merupakan sebuah percobaan");

        f.setSize(400, 150);

        Container content = f.getContentPane();

        content.setBackground(Color.white);

        content.setLayout(new FlowLayout());

        content.add(new JButton("Tombol 1"));

        content.add(new JButton("Tombol 2"));

        content.add(new JButton("Tombol 3"));

        f.addWindowListener(new ExitListener());

        f.setVisible(true);

    }

   

}