Animal

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Animal[] animals = { new Dog(), new Cat(), new Lion(), new Cow() };
        Scanner scanner = new Scanner(System.in);
        System.out.println("動物名を入力してください（いぬ、ねこ、らいおん、うし）");
        System.out.print("> ");
        String name = scanner.next();
        for (Animal animal : animals) {
            System.out.println(animal.echo(name));
        }
    }
}

class Animal {
    public String echo(String name) {
        return getName().equals(name) ? getVoice() : "";
    }

    protected String getName() {
        return "";
    }

    protected String getVoice() {
        return "";
    }
}

class Dog extends Animal {
    protected String getName() {
        return "いぬ";
    }

    protected String getVoice() {
        return "わおーん";
    }
}

class Cat extends Animal {
    protected String getName() {
        return "ねこ";
    }

    protected String getVoice() {
        return "にゃおーん";
    }
}

class Lion extends Animal {
    protected String getName() {
        return "らいおん";
    }

    protected String getVoice() {
        return "がおーん";
    }
}

class Cow extends Animal {
    protected String getName() {
        return "うし";
    }

    protected String getVoice() {
        return "もおーん";
    }
}