Question

/* Create a Picture which is an NxN grid of color squares
  * each square is a random color of size*size pixels */
  public static Picture create(int N, int size)

 /* Create a two-dimensional NxN array of random Colors*/
  public static Color[][] createColors(int N)

 /* Generate a random Color (R,G,B each between 0 and 255) */
  public static Color generateRandomColor()

Answer 1

Please find the code below:::

DrawPicture.java

package graphichal;

import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;

import javax.swing.JComponent;
import javax.swing.JFrame;

class Picture{
   int size;
   Color colors[][];
   Picture(int size){
       this.size = size;
   }

   void drawPicture(Graphics g){
       for(int i=0;i<colors.length;i++){
           for(int j=0;j<colors.length;j++){
               g.setColor(colors[i][j]);
               g.fillRect(i*size, j*size, size, size);
           }  
       }
   }
}

public class DrawPicture {

   /* Create a Picture which is an NxN grid of color squares
   * each square is a random color of size*size pixels */
   public static Picture create(int N, int size){
       Picture picture = new Picture(size);
       picture.colors = createColors(N);
       return picture;
   }

   /* Create a two-dimensional NxN array of random Colors*/
   public static Color[][] createColors(int N){
       Color colors[][] = new Color[N][N];
       for(int i=0;i<N;i++){
           for(int j=0;j<N;j++){
               colors[i][j] = generateRandomColor();
           }  
       }
       return colors;
   }

   /* Generate a random Color (R,G,B each between 0 and 255) */
   public static Color generateRandomColor(){
       Random rand = new Random();
       Color color = new Color(rand.nextInt(255), rand.nextInt(255), rand.nextInt(255));
       return color;
   }

   public static void main(String[] a) {
       JFrame window = new JFrame("Picture");
       window.setSize(1000,1000);
       window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       window.getContentPane().add(new JComponent() {
           private static final long serialVersionUID = 1L;
           //paint function call recursion function once
           public void paint(Graphics g) {
               Picture pic = create(20, 20);
               pic.drawPicture(g);
           }
       });
       window.setVisible(true);
   }

}

output:

ture.java Eclipse Run | Picture