cc150_9_7.java

import java.util.Random;




public class Q9_7 {
 

    public static void Paintfil(char[][] screen, int x, int y, char newcolor, char oldcolor){
    	if(x < 0 || x > screen[0].length-1 ||
    		y <0 || y > screen.length-1 || screen[x][y] != oldcolor)
    		return;
    	screen[x][y] = newcolor;
    	Paintfil(screen, x-1,y,newcolor,oldcolor);
    	Paintfil(screen, x+1,y,newcolor,oldcolor);
    	Paintfil(screen, x,y-1,newcolor,oldcolor);
    	Paintfil(screen, x,y+1,newcolor,oldcolor);
    	
    }
	
	
	
	
	
	public static void main(String[] args) {
    	char[][] screen = new char[6][8];
    	char[] ColorSet = new char[] { 'R', 'G', 'B' };
    	
    	Random r = new Random();
    	for (int i = 0; i < screen.length; i++){
    		for (int j = 0; j < screen[0].length; j++){
    			screen[i][j] = ColorSet[Math.abs(r.nextInt()) % ColorSet.length];
    			}
    	}
    	System.out.println("Before Paintfill");
    	
    	screen[2][4] = 'G';
    	
    	displayscreen(screen);
    	System.out.println("After Paintfill");
    	Paintfil(screen,2,4,'B','G');
    	displayscreen(screen);
   
    }

	private static void displayscreen(char[][] screen) {
		// TODO Auto-generated method stub
		for(int i = 0; i < screen.length; i ++){
			for (int j = 0; j < screen[0].length; j ++)
				System.out.print(screen[i][j]+" ");
			System.out.println();
		}
		
		System.out.println();
	}
}