Program to find frequency of every alphabet in a String

Write a program to input a string (word). Convert it into lowercase letters. Count and print the frequency of each alphabet present in the string. The output should be given as:
Sample Input: Alphabets
Sample Output:==========================
Alphabet             Frequency
==========================
a                              2
b                              1
e                              1
h                              1
l                               1
p                              1
s                              1
t                               1

import java.io.*;

class AlphabetFreq

{

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

    {

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

        System.out.print("Enter any string: ");

        String s = br.readLine();

  

        s=s.toLowerCase(); //converting the string into lowercase

        int l=s.length(); //finding the length of the string

  

        char ch;

        System.out.println("Output:");

        System.out.println("=========================="); //this is just for styling the look of the output

        System.out.println("Alphabet\tFrequency");

        System.out.println("==========================");

  

        /* Counting frequency of alphabets begins below */

        int count=0;

        for(char i='a'; i<='z'; i++)

            {

                count = 0;

                for(int j=0; j<l; j++)

                {

                    ch=s.charAt(j); //extracting characters of the string one by one

                    if(ch==i) //first checking the whole string for 'a', then 'b' and so on

                        count++; //increasing count of those aplhabets which are present in the string

                }

                if(count!=0)//printing only those alphabets whose count is not '0'

                {

                    System.out.println(i+"\t\t"+count);

                }

            }

    }

}




Output:

Enter any string: ilovejavaforschool

Output:
==========================
Alphabet             Frequency
==========================
a                               2
c                               1
e                              1
f                               1
h                              1
i                                1
j                                1
l                                2
o                               4
r                                1
s                               1
v                               2