Virtual Pet Simulator: Constructor References (JavaBasics_Task_372_V0.1)

📖 Description

Manually instantiating objects can lead to rigid code structures. This project explores Constructor References, a specialized form of method reference that points to a class constructor. By binding the AnimalFactory interface to the Animal : : new reference, we decouple the logic of "when to create" from "how to create". This approach is essential for modern Java patterns, such as the Abstract Factory and the use of Collectors in Stream API.

📋 Requirements Compliance

• Dynamic Factory: Created the AnimalFactory interface to serve as an object creation contract.
• Constructor Binding: Used the Animal : : new syntax to implement the factory method concisely.
• Object State: Ensured the Animal class properly initializes its name field via constructor.
• Functional Validation: Successfully created and verified a pet named "Barsik".

🚀 Architectural Stack

• Java 8+ (Constructor References, Functional Interfaces)

🏗️ Implementation Details

• Animal: The base class representing a pet with a name.
• AnimalFactory: A functional interface that acts as a blueprint for creating animals.
• PetLauncherApp: The entry point that executes the "birth" of a new virtual pet.

📋 Expected result

Pet name: Barsik

💻 Code Example

Project Structure:

JavaBasics_Task_372/
├── src/
│   └── com/yurii/pavlenko/
│                 ├── app/
│                 │   └── PetLauncherApp.java
│                 └── pet/
│                     ├── contracts/
│                     │   └── AnimalFactory.java
│                     └── models/
│                         └── Animal.java
├── LICENSE
├── TASK.md
├── THEORY.md
└── README.md

Code

package com.yurii.pavlenko.app;

import com.yurii.pavlenko.pet.contracts.AnimalFactory;
import com.yurii.pavlenko.pet.models.Animal;

public class PetLauncherApp {

    public static void main(String[] args) {

        AnimalFactory factory = Animal::new;

        Animal pet = factory.create("Barsik");

        System.out.println("Pet name: " + pet.getName());
    }
}

package com.yurii.pavlenko.pet.contracts;

import com.yurii.pavlenko.pet.models.Animal;

@FunctionalInterface
public interface AnimalFactory {
    Animal create(String name);
}

package com.yurii.pavlenko.pet.models;

public class Animal {
    private final String name;

    public Animal(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

⚖️ License

This project is licensed under the MIT License.

Copyright (c) 2026 Yurii Pavlenko

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files...

License: MIT