// Fig. 12.28: DrawPolygons.java
// Drawing polygons.
import javax.swing.JFrame;
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JPanel;

public class DrawPolygons 
{
   // execute application
   public static void main( String[] args )
   {
      // create frame for PolygonsJPanel
      JFrame frame = new JFrame( "Drawing Polygons" );
      frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

      PolygonsJPanel polygonsJPanel = new PolygonsJPanel(); 
      frame.add( polygonsJPanel ); // add polygonsJPanel to frame
      frame.setSize( 280, 270 ); // set frame size
      frame.setVisible( true ); // display frame
   } // end main
} // end class DrawPolygons


class PolygonsJPanel extends JPanel 
{
   // draw polygons and polylines
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g ); // call superclass's paintComponent

      // draw polygon with Polygon object
      int[] xValues = { 20, 40, 50, 30, 20, 15 };
      int[] yValues = { 50, 50, 60, 80, 80, 60 };
      Polygon polygon1 = new Polygon( xValues, yValues, 6 );
      g.drawPolygon( polygon1 );

      // draw polylines with two arrays
      int[] xValues2 = { 70, 90, 100, 80, 70, 65, 60 };
      int[] yValues2 = { 100, 100, 110, 110, 130, 110, 90 };
      g.drawPolyline( xValues2, yValues2, 7 );

      // fill polygon with two arrays
      int[] xValues3 = { 120, 140, 150, 190 };
      int[] yValues3 = { 40, 70, 80, 60 };
      g.fillPolygon( xValues3, yValues3, 4 );

      // draw filled polygon with Polygon object
      Polygon polygon2 = new Polygon();
      polygon2.addPoint( 165, 135 );
      polygon2.addPoint( 175, 150 );
      polygon2.addPoint( 270, 200 );
      polygon2.addPoint( 200, 220 );
      polygon2.addPoint( 130, 180 );
      g.fillPolygon( polygon2 );
   } // end method paintComponent
} // end class PolygonsJPanel

Results