Question

How to remove even frequency characters from a string in Java

Answer 1

import java.util.*; 

public class Test {
    static String remove_even_frequency_characters(String s) { 
        HashMap<Character, Integer> hm = new HashMap<>(); 
          
        for (int i = 0; i < s.length(); i++) { 
            if (hm.containsKey(s.charAt(i))) {
                hm.put(s.charAt(i),  
                hm.get(s.charAt(i)) + 1); 
            }
            else {
                hm.put(s.charAt(i), 1); 
            }    
        } 
      
        String new_string = ""; 

        for (int i = 0; i < s.length(); i++) { 
            if (hm.get(s.charAt(i)) % 2 == 0) {
                continue; 
            }
            new_string = new_string + s.charAt(i); 
        } 
      
        return new_string; 
    } 
   
    public static void main(String args[]) {
        String s = "java programming version 11"; 

        String new_string = remove_even_frequency_characters(s);
       
        System.out.println(new_string); 
    }
}


/*
run:

jaa prra ers 

*/

 

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