Number Pattern 2 by for loop

Code Box by for loop
--------------------------

/*program to print star pattern by for loop

  1
  12
  123
  1234
  12345

*/

class npat2
{
public static void main(String a[])
{
int n,i,j;

n=Integer.parseInt(a[0]);

for(i=1;i<=n;i++)
{
        for(j=1;j<=i;j++)
        {
        System.out.print(j);
        }

System.out.print("\n");

}
}
}