Factory-Java.java

// Factory Method
public interface Human {
    String getName();
}

/// Tanaka Factory
final class TanakaImpl implements Human {
    @Override public String getName() {
        return "Tanaka";
    }
}

final public class TanakaFactory {
    public static Human getInstance() {
        return new TanakaImpl();
    }
}

/// Yamada Factory
final class YamadaImpl implements Human {
    @Override public String getName() {
        return "Yamada";
    }
}

final public class YamadaFactory{
    public static Human getInstance() {
        return new YamadaImpl();
    }
}

Human human = TanakaFactory.getInstance();
System.out.println(human.getName); // Tanaka

human = YamadaFactory.getInstance();
System.out.println(human.getName); // Yamada