JavaSE enum

public class EnumExam {
    enum Animal {
        DOG, CAT, RAT, RABBIT
    };
    
    public static void main(String[] args) {
        Animal a = Animal.DOG;

        switch(a){
            case DOG:
                System.out.println("いぬ");
                break;
            case CAT:
                System.out.println("ねこ");
                break;
            case RAT:
                System.out.println("ねずみ");
                break;
            case RABBIT:
                System.out.println("うさぎ");
                break;
            default:
                System.out.println("？");
                break;
        }
    }
}

public class EnumExam2 {
    enum Animal {
        DOG, CAT, RAT, RABBIT
    };
    
    public static void main(String[] args) {
        // enum が取り得る値を列挙
        for(Animal a : Animal.values()) {
            System.out.println(a.ordinal() + ":" + a.name());
        }
        System.out.println("\n");

        // 文字列から enum をインスタンス化
        Animal c = Animal.valueOf("CAT");
        System.out.println("CAT IS " + c.name());

        Animal h = Animal.valueOf("HORSE");
        System.out.println("HORSE IS " + h.name());
    }
}

public class EnumExam3 {
    enum Animal {
        DOG("ぽち"){
            @Override
            String sayHello(){
                return "こんにちわん";
            }            
        },
        CAT("みけ"){
            @Override
            String sayHello(){
                return "こんにちにゃお";
            }
        },
        RAT("ちゅーた"){
            @Override
            String sayHello(){
                return "こんにちちゅう";
            }
        },
        RABBIT("うさこ"){
            @Override
            String sayHello(){
                return "もぐもぐ";
            }
        };

        private String pName;
        Animal(String name){
            pName = name;
        }

        @Override
        public String toString(){
            return pName;
        }

        abstract String sayHello();
    };
    
    public static void main(String[] args) {
        // enum が取り得る値を列挙
        for(Animal a : Animal.values()) {
            System.out.println(a.toString() + "\t「" + a.sayHello() + "」");
        }
    }
}