Java Program to display the pattern like a diamond

import java.util.Scanner;
public class demo1 
{
  public static void main(String[] args)	 	  
     {
        int i,j,r;
        System.out.print("Input number of rows (half of the diamond) : ");
        Scanner input = new Scanner(System.in);
		    r = input.nextInt();
        for(i=0;i<=r;i++)
          {
            for(j=1;j<=r-i;j++)
            System.out.print(" ");
            for(j=1;j<=2*i-1;j++)
            System.out.print("*");
            System.out.print("\n");
          }
        for(i=r-1;i>=1;i--)
          {
            for(j=1;j<=r-i;j++)
            System.out.print(" ");
            for(j=1;j<=2*i-1;j++)
            System.out.print("*");
            System.out.print("\n");
          }
 
     }
}