Question

What is wrong with this code please. I need to draw CIRCLES in JFrame JAVA.  recursively

1. Draw a circle centered near the top of the JPanel
2. After drawing a circle, your program should draw two more circles half way to the left and right of the circle just drawn and located "one level" lower in the JPanel. Do this drawing as long as the drawing would not be below the bottom of the JPanel
3. Each newly drawn circle then follows the rule at B.

import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class RecursionProblem_3 {
  
  
   public static void main(String[] args) {
      
       RecursionProblem_3 drowCircle = new RecursionProblem_3();
      
   }
  
  
   public RecursionProblem_3() {
      
       JFrame frame = new JFrame ("DROWING CIRCLES");
         
       frame.setSize(1000, 1000);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
       frame.getContentPane().add(new JPanel(){
          
           public void paint(Graphics g) {
              
               int radius = 80;
               int x = getWidth()/2.4 = 80;
               RecursionProblem_3(x,y,radius,g,hight());
              
           }
          
       });
      
       frame.setVisible(true);

  
   }

  
   public static void RecursionProblem_3(int x, int y, int radius, Graphics g.bottom) {
      
      
       if (y >= bottom) {
          
           return;
          
       }else {
          
           g.drawOval(X-redius/2, y-radius/2, radius, radius);
           RecursionProblem_3(x-radius/2, y +100, radius, g.bottom);
           RecursionProblem_3(x+radius/2, y +100, g.bottom);
       }
      
      
   }
}

try to create JPanel. thank you.

Answer 1

Please find the code below:::

RecursionProblem_3.java

package classes1;

import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class RecursionProblem_3 {

   public static void main(String[] args) {

       RecursionProblem_3 drowCircle = new RecursionProblem_3();

   }

   public RecursionProblem_3() {

       JFrame frame = new JFrame ("DROWING CIRCLES");

       frame.setSize(1000, 1000);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       frame.getContentPane().add(new JPanel(){
           private static final long serialVersionUID = 1L;

           public void paint(Graphics g) {

               int radius = 80;
               int x = getWidth()/2;
               int y = 80;
               RecursionProblem_drawCircle(x,y,radius,g,getHeight());

           }

       });

       frame.setVisible(true);

   }

   public static void RecursionProblem_drawCircle(int x, int y, int radius, Graphics g,int bottom) {

       if (y >= bottom) {

           return;

       }else {

           g.drawOval(x-radius/2, y-radius/2, radius, radius);
           RecursionProblem_drawCircle(x-radius/2, y +100, radius, g,bottom);
           RecursionProblem_drawCircle(x+radius/2, y +100,radius, g,bottom);
       }

   }
}

output: