Question

How to draw a random color rectangle with Rectangle2D() function in Java

Answer 1

package javaapplication1;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.util.Random;
import java.awt.Shape;

public class Example extends JPanel {
   @Override
   public void paintComponent(Graphics g) {
      super.paintComponent(g);

      Graphics2D g2d = (Graphics2D) g;

      Shape s1 = new Rectangle2D.Double(20, 20, 60, 60);
      
      Random r = new Random();
      g2d.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
      g2d.fill(s1);
   }

   public static void main(String[] args) {
      JFrame f = new JFrame("Draw With Java");
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      f.add(new Example());
      f.setSize(300, 350);
      f.setVisible(true);
   }
}
 
/*
run:
 
// see the random color rectangle on the run screen
 
*/

 

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