Print Pyramid in java

import java.io.*;
class printPyramidDemo
{
public static void main(String arg[]) throws IOException
     {
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter the height of pyramid ");
 String s=br.readLine();
int a=Integer.parseInt(s);
 for(int i=0; i<=a; i++)
         {
            for(int k=a; k>=i; k--)
               {
                System.out.print(" ");
                }
           int c=(2*i)-1;
           for(int j=1; j<=c; j++)
               {
                  System.out.print("*");
               }
    System.out.print("\n");
          }
     }
}

output