print characters using for loop in java

/*

   ASCII values Capital letters starts from 65 to 90

   Ex - A - 65

*/

package starslayout;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.Scanner;

public class starTwentyOne 

{

    public static void main(String[] args) throws Exception

     {

        int n,j,i,k;

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        Scanner sc=new Scanner(System.in);

        System.out.println("Enter limit of the levels of star : ");

        n=sc.nextInt();

        k=65+n;

         for(i=65;i<=k;i++)

         {

             for(j=65;j<=i;j++)

                 System.out.print((char)j);

             System.out.println();

         }

     }

}

Output

Enter limit of the levels of star : 

6

A

AB

ABC

ABCD

ABCDE

ABCDEF

ABCDEFG