count the occurrences of a specific character in the input

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How do I count the number of occurrences of a char in a String?

I am looking to count the occurrences of a specific character, for example "i" that occurs in the input.

Example, from standard input: Lorem ipsum dolor sit amet, consectetur adipiscing elit.

This returns 6, because there are 6 occurrences of the letter "i" (case matters).

This could be accomplished with a loop stepping through the string with charAt(i).

Is there a more elegant way to accomplish this?

Whats not elegant about this solution? – Amir Afghani Nov 01 '10 at 18:00 — Amir Afghani, Nov 01 '10 at 18:00

score 2 · Accepted Answer · edited Apr 18 '14 at 14:36

2

This is basically the same as stepping through a string, but you could create a method like so:

private int substrCount(string findStr, string str)
{
    lastIndex = 0;
    count = 0;
    while(lastIndex != -1){
        lastIndex = str.indexOf(findStr, lastIndex);

        if(lastIndex != -1){
            count++;
        }
    }
}

edited Apr 18 '14 at 14:36

Floris Velleman

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answered Nov 01 '10 at 18:04

ashurexm

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I think this is more neat: public int countCharOccurrence(String string, char countChar){ int count = 0; for(int i =0; i – Ben Nov 19 '12 at 15:42

score 0 · Answer 2 · answered Nov 01 '10 at 18:01

0

Bet you could loop over the results of String.indexOf(), specifically the two input form, where you can tell it to start looking at the location of the last match.

answered Nov 01 '10 at 18:01

zigdon

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count the occurrences of a specific character in the input

2 Answers2