Find the most common String in ArrayList()

Question

Is there a way to find the most common String in an ArrayList?

ArrayList list = new ArrayList<>();
list.add(\"t         


        

Answer 1

With this method, if there is more than one most common elements in your ArrayList, you get back all of them by adding them to a new ArrayList.

public static void main(String[] args) {

 List  words = new ArrayList<>() ; 

words.add("cat") ; 
words.add("dog") ; 
words.add("egg") ; 
words.add("chair") ; 
words.add("chair") ; 
words.add("chair") ; 
words.add("dog") ; 
words.add("dog") ;  

Map count = new HashMap<>() ; 

    for (String word : words) {  /* Counts the quantity of each 
                                      element */
        if (! count.containsKey(word)) {             
            count.put(word, 1 ) ; 
        }

        else {
            int value = count.get(word) ; 
            value++ ; 

            count.put(word, value) ;
        }       
    }

    List  mostCommons = new ArrayList<>() ; /* Max elements  */

    for ( Map.Entry e : count.entrySet() ) {

        if (e.getValue() == Collections.max(count.values() )){
                            /* The max value of count  */

            mostCommons.add(e.getKey()) ;
        }   
    }

    System.out.println(mostCommons);

 }

}