Tiny File Manager

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SelectShape extends JFrame {
   private final int CIRCLE = 0;
   private final int SQUARE = 1;
   private final int OVAL = 2;
   private final int RECTANGLE = 3;
   private JComboBox choice;
   private int shape;

public SelectShape()
   {
      choice = new JComboBox();
      choice.addItem( "Circle" );
      choice.addItem( "Square" );
      choice.addItem( "Oval" );
      choice.addItem( "Rectangle" );

choice.addItemListener(
         new ItemListener() {
            public void itemStateChanged( ItemEvent e )
            {
               setShape( choice.getSelectedIndex() );
               repaint();
            }
         }
      );

getContentPane().add( choice, BorderLayout.SOUTH );
      setSize( 300, 200 );
      show();
   }

public void paint( Graphics g )
   {
      for ( int k = 1; k <= 20; k ++ ) {
         int w = ( int ) ( Math.random() * getSize().width );
         int h = ( int ) ( Math.random() * getSize().height );
         int x = ( int ) ( Math.random() * getSize().width );
         int y = ( int ) ( Math.random() * getSize().height );

switch ( shape ) {
            case CIRCLE:
               g.drawOval( x, y, w, w );
               break;
            case SQUARE:
               g.drawRect( x, y, w, w );
               break;
            case OVAL:
               g.drawOval( x, y, w, h );
               break;
            case RECTANGLE:
               g.drawRect( x, y, w, h );
               break;
         }
      } 
   }

public void setShape( int s ) { shape = s; }

public static void main( String args[] )
   {
      SelectShape app = new SelectShape();

app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   }
}