About making a X-mas Tree in java [on hold]

This code is supposed to produce this output:

Enter Height of the tree: 5

    I
   *I*
  **I**
 ***I***
****I****

But it doesn't. How can I fix it?

import java.util.Scanner;
public class RightTriangle {
    public static void main(String args[]) 
            { 
Scanner keys = new Scanner (System.in); 

int high ; 
System.out.println("Enter height of the tree"); 
high = keys.nextInt(); 


for (int i=0; i< high; i++) 
{ 
for ( int j=0; j<high -1 -i ; j++) 
{ 
System.out.print(" "); 
} 

for (int k=0; k<i*2+1; k++) 
{ 
System.out.print("*"); 
} 
System.out.println (); 
} 
} 
}