APL/DEV 3.2/TP01/Fréquences/Frequences.java

import java.util.Hashtable;
import java.util.Map;

public class Frequences<T> {
    public T mostFrequent(T[] tab) {
        Hashtable<T, Integer> indexList = new Hashtable<T, Integer>();

        for (T element : tab) {
            indexList.put(element, indexList.get(element) == null ? 1 : ((Integer)indexList.get(element)) + 1);
        }

        T element = tab[0];
        Integer count = indexList.get(tab[0]);

        for(Map.Entry<T, Integer> entry : indexList.entrySet()) {
            if (entry.getValue() > count) {
                element = entry.getKey();
                count = entry.getValue();
            }
        }

        return element;
    }

    public Liste<T> getFrequences(T[] tab) {
        Hashtable<T, Integer> indexList = new Hashtable<T, Integer>();

        for (T element : tab) {
            indexList.put(element, indexList.get(element) == null ? 1 : ((Integer)indexList.get(element)) + 1);
        }

        Association<T> lastEntry = null;
        boolean first = true;

        Liste<T> list = new Liste<T>();

        for(Map.Entry<T, Integer> entry : indexList.entrySet()) {
            if (first) {
                lastEntry = new Association<T>(entry.getKey(), entry.getValue());
                list.setFirstElement(lastEntry);
                first = false;
            } else {
                Association<T> newEntry = new Association<T>(entry.getKey(), entry.getValue());
                lastEntry.setSuivant(newEntry);
                lastEntry = newEntry;
            }
        }

        return list;
    }

    public static void main(String[] args) {
        Frequences<String> f = new Frequences<String>();

        String[] tab = {"test", "test", "test", "12", "12", "12", "12"};

        System.out.println(f.mostFrequent(tab));
    }
}