Spiral Matrix logic implemented in java

SprialMatrix.java

//spiral matrix method is used
import java.io.*;
import java.util.Scanner;

public class BrainTeaser{
	static int[] array = new int[200];
	static int userchoice;

	//brainFunction called here
	public static void brainTeaser(int number,int n,int[][] initalarr){
		//matrix array declaration
		int[][] matrixarray = new int[n][n];
		//initially fill 0
		for(int i=0;i<n;i++){
			for(int j=0;j<n;j++){
				initalarr[i][j] = 0;
			}
		}
		//fillspiral function is called
		fillspiral(initalarr,0,0,n,n*n,number,matrixarray,'R');//initially the direction starts from right
	}
	//fillspiral function called
	//global declaration
	static void fillspiral(int[][] initalarr,int x,int y,int n,int k,int number,int[][] matrixarray,char dir){
		//to check the condtion if the matrixarray is filled

		if(x<0 || x>=n || y<0 || y>=n || matrixarray[x][y]==1)
			return ;
		//condition to check if number is greater
		if(k > number){
			initalarr[x][y] = 0;
		}else{
			initalarr[x][y] = number;
		}
		//switch condtion
		matrixarray[x][y] = 1;//to check if the array is processed or not
		//to check if number is greater or not
		if(number > k)
			initalarr[x][y] = 0;
		else
			initalarr[x][y] = number;
		//switch case starts here
		switch(dir){
			case 'R':
					fillspiral(initalarr,x,y+1,n,k,number-1,matrixarray,'R');
				    fillspiral(initalarr,x+1,y,n,k,number-1,matrixarray,'D');
				    fillspiral(initalarr,x,y-1,n,k,number-1,matrixarray,'L');
				    fillspiral(initalarr,x-1,y,n,k,number-1,matrixarray,'U');
			break;
			case 'D':
					fillspiral(initalarr,x+1,y,n,k,number-1,matrixarray,'D');
		        	fillspiral(initalarr,x,y-1,n,k,number-1,matrixarray,'L');
		        	fillspiral(initalarr,x-1,y,n,k,number-1,matrixarray,'U');
		        	fillspiral(initalarr,x,y+1,n,k,number-1,matrixarray,'R');
			break;
			case 'U':
					fillspiral(initalarr,x-1,y,n,k,number-1,matrixarray,'U');
			        fillspiral(initalarr,x,y+1,n,k,number-1,matrixarray,'R');
			        fillspiral(initalarr,x+1,y,n,k,number-1,matrixarray,'D');
			        fillspiral(initalarr,x,y-1,n,k,number-1,matrixarray,'L');
			break;
			case 'L':
					fillspiral(initalarr,x,y-1,n,k,number-1,matrixarray,'L');
			        fillspiral(initalarr,x-1,y,n,k,number-1,matrixarray,'U');
			        fillspiral(initalarr,x,y+1,n,k,number-1,matrixarray,'R');
			        fillspiral(initalarr,x+1,y,n,k,number-1,matrixarray,'D');

		}
	}
	
	//printmatrix function called
	static void printmatrix(int[][] initalarr,int n){
		for(int x=0;x<n;x++){
			for(int y=0;y<n;y++){
				if(initalarr[x][y] == 0);
				System.out.print(initalarr[x][y] + "\t");
			}
			System.out.println();
		}
	}
	//main function
	public static void main(String[] args){
		Scanner sc =  new Scanner(System.in);
		System.out.println("Enter the Odd number:(Odd number only)");
		userchoice = sc.nextInt();
		System.out.println("Matrix will printed like");
		System.out.println("-------------------------");
		//condition to check if the number is odd or not
		if((userchoice & 1) == 0){
			System.out.println("Entered number is not an Odd number");
		}
		else{
			double val = Math.ceil(Math.sqrt(userchoice));
			int n = (int)val;
			//array declaration
			int[][] initalarr =  new int[n][n];
			//brainTeaser function called here
			brainTeaser(userchoice,n,initalarr);
			//print the matrix format of the array
			printmatrix(initalarr,n);
		}	
	}
}