Java Using Shapes Program

Display polygon using GUI

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

            public class Main extends JPanel 

{

   public void paintComponent(Graphics g) 

  {

      super.paintComponent(g);

      Polygon p = new Polygon();

      for (int i = 0; i < 5; i++)

      p.addPoint((int) 

      (100 + 50 * Math.cos(i * 2 * Math.PI / 5)),

      (int) (100 + 50 * Math.sin(i * 2 * Math.PI / 5)));

      g.drawPolygon(p);

   }

   public static void main(String[] args) 

  {

      JFrame frame = new JFrame();

      frame.setTitle("Polygon");

      frame.setSize(350, 250);

      frame.addWindowListener(new WindowAdapter()

      {

         public void windowClosing(WindowEvent e) 

         {

            System.exit(0);

         }

      });

      Container contentPane = frame.getContentPane();

      contentPane.add(new Main());

      frame.setVisible(true);

   }

}

Display text in a rectangle

import java.awt.*;

import javax.swing.*

            public class Main extends JPanel 

{

   public void paint(Graphics g) 

  {

      g.setFont(new Font("",0,100));

      FontMetrics fm = getFontMetrics(new Font("",0,100));

      String s = "message";

      int x = 5;

      int y = 5;

      for (int i = 0; i < s.length(); i++) 

      {

         char c = s.charAt(i);

         int h = fm.getHeight();

         int w = fm.charWidth(c);

         g.drawRect(x, y, w, h);

         g.drawString(String.valueOf(c), x, y + h);

         x = x + w;

      }

   }

   public static void main(String[] args)

  {

      JFrame frame = new JFrame();

      frame.setDefaultCloseOperation(JFrame.Exit_on_close);

      frame.setContentPane(new Main());

      frame.setSize(500, 700);

      frame.setVisible(true);

   }

}

Display different shapes

import java.awt.Shape;

import java.awt.geom.*;

public class Main

 {

   public static void main(String[] args) 

  {

      int x1 = 1, x2 = 2, w = 3, h = 4, 

      x = 5, y = 6, 

                  y1 = 1, y2 = 2, start = 3;

      Shape line = new Line2D.Float(x1, y1, x2, y2);

      Shape arc = new Arc2D.Float(x, y, w, h, start, 1, 1);

      Shape oval = new Ellipse2D.Float(x, y, w, h);

      Shape rectangle = new Rectangle2D.Float(x, y, w, h);

                  Shape roundRectangle = new RoundRectangle2D.Float(x, y, w, h, 1, 2);

      System.out.println("Different shapes are created:");

   }

}

Display different shapes

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

            public class Main extends JPanel 

{

            public static void main(String[] a) 

   {

      JFrame f = new JFrame();

      f.setSize(400, 400);

      f.add(new Main());

      f.setDefaultCloseOperation(JFrame.Exit_on_close);

      f.setVisible(true);

   }

                public void paint(Graphics g) 

                {

      g.fillRect (5, 15, 50, 75);

   }

}