Count specific character in a string

Question

I can't find a reason as to why arr[i].charAt(word) is not working.

public static void main(String[] args) {
    String [] arr = {"121", "333", "333"};
    int count = 0;
    int word = 0;
    for (int i = 0; i < arr.length; i++) {
        for (word = 0; word<arr[i].length(); word++) {
            if (arr[i].charAt(word) == 1) { //this line gives me trouble
                count++;
                System.out.println(count);
            }
        }
    }
}

Why isnt it?

shree.pat18 · Accepted Answer · 2014-07-31 12:52:26Z

6

charAt returns a char, so you need to put 1 in single quotes when comparing it as a char like so:

if(arr[i].charAt(word)== '1')

answered Jul 31, 2014 at 12:52

shree.pat18

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Comments

MarioDS · Accepted Answer · 2014-07-31 12:53:37Z

1

You're not comparing a char to a char, you're comparing a char to an int. Which just happens to be legal because chars are numbers internally (put very simply, there's more to it than that of course).

Change the line to:

if(arr[i].charAt(word)== '1')

Notice the quotes.

answered Jul 31, 2014 at 12:53

MarioDS

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