What are the requirements to run a Swing application?

Question

I'm trying to send a simple swing application to a friend that has Mac OSX, but the buttons don't show up.
Do people actually need the Java SDK in order for swing apps to work? Or is plain java enough? (He has normal java, because we play minecraft sometimes)
Anyway, my buttons are not showing up on his computer, not even when I use the cross platform look at feel

Answer 1

Here is the code I'm using, it's an application that makes the user select a folder and stuff will happen to it.
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class SomeGUI extends JFrame implements ActionListener, Runnable
    public JButton exit;
    public JButton run;
    JPanel panel;
    JFileChooser chooser;
    String returnpath;
    JLabel progress;
  public SomeGUI()
     try
     UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
     catch (ClassNotFoundException ex)
         Logger.getLogger(SomeGUI.class.getName()).log(Level.SEVERE, null, ex);
     catch (InstantiationException ex)
         Logger.getLogger(SomeGUI.class.getName()).log(Level.SEVERE, null, ex);
     catch (IllegalAccessException ex)
         Logger.getLogger(SomeGUI.class.getName()).log(Level.SEVERE, null, ex);
     catch (UnsupportedLookAndFeelException ex)
         Logger.getLogger(SomeGUI.class.getName()).log(Level.SEVERE, null, ex);
      setTitle("BenkyoAdd");
      setSize(206,100);
      setResizable(false);
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      setLocationRelativeTo(null);
      setVisible(true);
      panel = new JPanel();
      getContentPane().add(panel);
      panel.setLayout(null);
      run = new JButton("Run");
      run.setFocusable(false);
      run.setBounds(0,0,100,30);
      panel.add(run);
      run.addActionListener(this);
      progress = new JLabel("Please click run");
      progress.setFont(new Font("lol",Font.PLAIN,14));
      progress.setBounds(10, 30, 200, 50);
      panel.add(progress);
      exit = new JButton("Exit");
      exit.setFocusable(true);
      exit.setBounds(100, 0, 100, 30);
      panel.add(exit);
      exit.addActionListener(this);
      chooser = new JFileChooser();
      chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    public void actionPerformed(ActionEvent e)
     if(e.getSource().equals(exit))
         System.exit(0);
     if(e.getSource().equals(run))
         progress.setText("Select a folder...");
         chooser.showOpenDialog(panel);
         this.returnpath = chooser.getSelectedFile().getAbsolutePath();
         exit.setEnabled(false);
         run.setEnabled(false);
         progress.setText("Copying to output folder...");
         new Thread(this).start();
  public static void main(String args[])
      new SomeGUI();
    public void run()
     new Changer(this, this.returnpath);
     exit.setEnabled(true);
     exit.requestFocusInWindow();
     progress.setText("Done! You can now exit!");
}