03. Animal Type

import java.util.Objects;
import java.util.Scanner;

public class  AnimalType {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String animal = scanner.nextLine();

        if (Objects.equals(animal, "dog")) {
            System.out.println("mammal");
        } else if
        (Objects.equals(animal, "crocodile")
                        || Objects.equals(animal, "tortoise")
                        || Objects.equals(animal, "snake")) {
            System.out.println("reptile");
        } else {
            System.out.println("unknown");
        }
    }
}

Решение с switch:

import java.util.Scanner;

public class  AnimalType {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String animal = scanner.nextLine();

        switch (animal) {
            case "dog":
                System.out.println("mammal");
                break;
            case "crocodile":
            case "tortoise":
            case "snake":
                System.out.println("reptile");
                break;
            default:
                System.out.println("unknown");
                break;
        }
    }
}