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  • A success story. I started building my own startup

    New Java Syntax
    Level 16, Lesson 0
    Lena is a practicing physician who for a long time was certain that software development would definitely not be her story. But today her story would surely surprise her former self. In high school, she had a testy relationship with computers, but years later she created an application for diagnosing diseases. Lena writes: "When...
    Available
  • Garbage collection

    New Java Syntax
    Level 16, Lesson 1
    If you don't save references to objects, the garbage collector will come for them at night to terminate them. As scary as this may sound, programmers are ready to pray to the Java garbage collector. Especially people who started their programming careers using other languages, such as C++.
    Available
  • Object lifetime

    New Java Syntax
    Level 16, Lesson 2
    It's time to philosophize about the life and death of objects! Programmers often create dozens and dozens of objects and store them in various lists, but they never clean up these lists. This causes bloating. To avoid this, you have to use objects correctly. You'll get your first introduction in lesson.
    Available
  • Try-with-resources statement

    New Java Syntax
    Level 16, Lesson 3
    "Amigo, ten-hut!" "I'm happy to learn Java, Captain!" "At ease, Amigo. Today we have a super interesting topic. We will talk about how a Java program interacts with external resources and we'll study one very interesting Java statement. Better not cover your ears." "I'm all ears...
    Available
  • Final tasks

    New Java Syntax
    Level 16, Lesson 4
    Several tasks must be completed at the end of the level. Some of them are more advanced and require student's to be able to google. Or think. Or think and google. Practice completing them day in and day out, and your skills will grow at an incredible speed. They were created especially for IDEA.
    Available
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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 © 2025 CodeGym