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Counting one character at a time from a file

G. Graz
Ranch Hand

Joined: Oct 23, 2006
Posts: 30
I am trying to count and store the frequency each letter occurs form a .txt file . I am at the point where I can read back the file but I can not get any methods to work that would count the frequency of a letter in that file .

Simple problems but here is some code that I think works in regard to counting the frequency but I am missing something to get it to function correctly ? Any ideas please let me know ! Thank you .

Again something where I think it would work but just do not see the error ?

So basically , I need to read a .txt file and print out that the character 'A' appeared x number of times .

Thank you again !
Rob Spoor

Joined: Oct 27, 2005
Posts: 20274

G. Graz wrote:

That's a bad idea. The read method returns how many characters were actually read; it can be anywhere between 0 and letters.length. If it is less than letters.length, the remainder will contain the characters that were already in the array before the call to read (in this case '\0'). You'd better use the return of

As for your problem, usually when counting occurrences a Map is used:

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42965
The standard idiom would be a loop like this:

Just to confuse you :-) , note that counting characters gets harder if the text can contain the full range of Unicode characters.
I agree. Here's the link:
subject: Counting one character at a time from a file
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