enum usage

java_example_enum.java

package com.company;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Random;

enum Letter {
    RougeVif,
    Mauve,
    Orange,
    Rose;

    private static final List<Letter> VALUES =
            Collections.unmodifiableList(Arrays.asList(values()));
    private static final int SIZE = VALUES.size();
    private static final Random RANDOM = new Random();

    public static Letter randomLetter()  {
        return VALUES.get(RANDOM.nextInt(SIZE));
    }

    /*
    usage example
     */

    public static void display(Letter s) {
        System.out.println(s.name());
    }

    public static void enumIterate() {
        for (Letter s : Letter.values()) {
            System.out.println(s.name());
        }
    }

    public static void enumSwitchExample(Letter s) {
        switch(s) {
            case Mauve:
                System.out.println("It's pretty cold");
                break;
        }
    }

    /*
    mutable: counter for each is private
     */
    private int count = 0;
    public void print() {
        System.out.println("The count of " + name() + " is " + count);
    }
    // possible de faire un setter de count public pour changer la valeur

}