java - Comparing charAt(x) to String array = letter [y] -

i trying write piece of code produces letter frequency using arrays. getting bit stuck on how compare letter in string letter in array. basic pseudo code follows.

import java.util.scanner;   public class test {     public static void main (string[]args){          scanner sc = new scanner (system.in);          system.out.print ("please enter sentence: ");         string str = sc.nextline();          string [] let = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};         float [] freq = new float [25];            int x,a = 0,b = 0, strcount = 0;         string str1;          str1 = str.replaceall(" ", "");          (x = 0; x < str1.length(); x++)         {             strcount++;         }         system.out.println("the number of characters in string :" + strcount);         system.out.println(); 

and i'm stuck on how compare str1 let array. have tried following has problem comparing.

    while (b < strcount)     {         while (a < let.length)         {             if (let[a] == str1.charat(b))             {                 freq[a] = freq[a]++ ;             }             if(let[a] != str1.charat(b))             {                 = a++;             }         }         b = b++;     }    

any appreciated.

thank you.

well, see number of other issues 1 you're asking simple enough.

if (let[a].charat(0) == str1.charat(b)) // <-- 1 letter {     freq[a]++ ; } else {     a++; } 

also, strcount = str1.length(); no need loop.