Number Pattern 9 by while loop

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

        1
       12
      123
     1234
    12345

*/

class npat9w
{
public static void main(String a[])
{
int n,i,j,k;
i=1;
n=Integer.parseInt(a[0]);

while(i<=n)
{j=n;
k=1;
        while(j>i)
        {
        System.out.print(" ");
        j--;
 }

        while(k<=i)
        {
        System.out.print(k);
 k++;
        }
System.out.print("\n");
i++;
}
}
}