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  • The danger of "empty" books in the library catalog 👻

    JAVA 25 SELF
    Level 23, Lesson 0
    The danger of "empty" books in the library catalog 👻
    1
    Locked
  • Method inside a method: Architectural prohibition 🏗️

    JAVA 25 SELF
    Level 23, Lesson 0
    Method inside a method: Architectural prohibition 🏗️
    1
    Locked
  • Mandatory naming of a new product 🏷️

    JAVA 25 SELF
    Level 23, Lesson 0
    Mandatory naming of a new product 🏷️
    1
    Locked
  • Fundamental immutability of the animal world 🌳

    JAVA 25 SELF
    Level 23, Lesson 1
    Fundamental immutability of the animal world 🌳
    1
    Locked
  • Dog Orchestra: Extending sounds, not replacing 🐶

    JAVA 25 SELF
    Level 23, Lesson 1
    Dog Orchestra: Extending sounds, not replacing 🐶
    1
    Locked
  • Strict name requirement for every pet 🐱

    JAVA 25 SELF
    Level 23, Lesson 1
    Strict name requirement for every pet 🐱
    1
    Locked
  • Intelligent number logging system 📊

    JAVA 25 SELF
    Level 23, Lesson 1
    Intelligent number logging system 📊
    1
    Locked
  • Simple Car Dealership Registry 🚗

    JAVA 25 SELF
    Level 23, Lesson 2
    Simple Car Dealership Registry 🚗
    1
    Locked
  • Secure price management in an online store 💰

    JAVA 25 SELF
    Level 23, Lesson 2
    Secure price management in an online store 💰
    1
    Locked
  • Password Protection: No Backdoors! 🔐

    JAVA 25 SELF
    Level 23, Lesson 2
    Password Protection: No Backdoors! 🔐
    1
    Locked
  • Who can "speak" at the zoo? 🐾

    JAVA 25 SELF
    Level 23, Lesson 2
    Who can "speak" at the zoo? 🐾
    1
    Locked
  • One method for any file 🎬

    JAVA 25 SELF
    Level 23, Lesson 3
    One method for any file 🎬
    1
    Locked
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CodeGym CodeGym is an online course for learning Java programming from scratch. This course is a perfect way to master Java for beginners. It contains 1200+ tasks with instant verification and an essential scope of Java fundamentals theory. To help you succeed in education, we’ve implemented a set of motivational features: quizzes, coding projects, content about efficient learning, and a Java developer’s career.
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Programmers Are Made, Not Born © 2026 CodeGym