Number Pattern 10 by While Loop

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/*program to print star pattern square box by while loop

        1
       21
      321
     4321
    54321

*/

class npat10w
{
public static void main(String a[])
{
int n,i,j,k;
i=1;
n=Integer.parseInt(a[0]);

while(i<=n)
{j=n;
 k=i;
        while(j>i)
        {
        System.out.print(" ");
        j--;
 }

        while(k>=1)
        {

        System.out.print(k);
        k--;
 }
System.out.print("\n");
i++;
}
}
}