Question

Write a method called countChar which accepts a string parameter and a character parameter and returns an integer, that is:

int countChar (String s, char c)

This method should count the number of occurrences of the character c within the string s, and return the count to the caller.

Also write a main method that tests countChar. All of the print statements and user interaction belong in the main method, not in countChar.

Answer 1

import java.util.Scanner;

public class CountCharacters {

    public static int countChar(String s, char c) {
        int count = 0;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == c)
                ++count;
        }
        return count;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a line of string: ");
        String s = in.nextLine();
        System.out.print("Enter a character: ");
        char ch = in.next().charAt(0);
        System.out.println(countChar(s, ch));
    }
}