Question

How to print characters that have even frequencies of occurrence in a string with Java

Answer 1

public class MyClass {
    public static void print_even_frequencies_char(String s) { 
        int[] letters = new int[256]; 
         
        for (int i = 0; i < s.length(); i++) {
             if (Character.isLetter(s.charAt(i))) {
                 char ch = s.charAt(i); 
                 letters[(int)ch]++;
             }
        }
          
        for (int i = 0; i < 256; i++) { 
            if (letters[i] != 0 && letters[i] % 2 == 0) {
                System.out.println(Character.toString ((char) i) + " " + letters[i]);
            }
        } 
    } 
    public static void main(String args[]) {
        String s = "java programming pro oo"; 
         
        print_even_frequencies_char(s);
    }
}
 
 
/*
run:
 
g 2
m 2
o 4
p 2
 
*/

 

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