CodeGym
Promotion
CodeGym University
Learning
Course
Tasks
Surveys & Quizzes
Games
Help
Schedule
Community
Users
Forum
Chat
Articles
Success stories
Activity
Reviews
Subscriptions
Light theme

Lessons

  • Reviews
  • About us
Start
Start learning
Start learning now
  • Quest map
  • Lessons
All quests Java Syntax Java Core Java Multithreading Java Collections JSP & Servlets Module 3. Java Professional Module 4. SQL & Hibernate Module 5. Spring Spring
All levels Level 0 Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10 Level 11 Level 12 Level 13 Level 14 Level 15 Level 16 Level 17 Level 18 Level 19 Level 20 Level 21 Level 22 Level 23 Level 24 Level 25 Level 26 Level 27 Level 28
  • You've reached Level 34

    Java Collections
    Level 4, Lesson 0
    You've reached Level 34
    Available
  • Recursion

    Java Collections
    Level 4, Lesson 1
    "Hi, Amigo. Today Bilaabo will tell you about recursion." "As you know, in Java some methods call other methods. Additionally, when a method is called, specific arguments are passed to it, but the method's local variables take certain values while it runs." "Uh-huh." "And as you know, different methods' internal variables are independent of one another." "Uh-huh." "So imagine the situation where a method ..."
    Available
  • Tasks | Level 4 | Lesson 2

    Java Collections
    Level 4, Lesson 2
    "Hi, Amigo! I found some great tasks for you ..."
    Available
  • Garbage collection

    Java Collections
    Level 4, Lesson 3
    "Hi! I decided to give you another small lesson about garbage collection." "As you already know, the Java machine itself monitors when an object becomes unnecessary, and deletes it." "Yep. You and Rishi told me about it earlier. I don't remember the details." "OK. Then let's go over it again ..."
    Available
  • Tasks | Level 4 | Lesson 4

    Java Collections
    Level 4, Lesson 4
    "What, do you miss me? Here you are ..."
    Available
  • WeakReference

    Java Collections
    Level 4, Lesson 5
    "Hello again!" "Now I'm going to tell you about one more wonderful thing: WeakReference." "It looks almost the same as SoftReference ..."
    Available
  • Tasks | Level 4 | Lesson 6

    Java Collections
    Level 4, Lesson 6
    Available
  • PhantomReference

    Java Collections
    Level 4, Lesson 7
    "Hi, Amigo!" "Hi, Rishi!" "Well, how was your day?" "Brilliant! Today Bilaabo told me about recursion, and Ellie told me about weak and soft references." "Did she tell you about phantom references?" "Are you talking about PhantomReference? She mentioned it, but didn't explain it in detail." "Great, then I hope you won't mind if I fill this gap." "Of course! I'll listen to you with pleasure, Rishi! ..."
    Available
  • Tasks | Level 4 | Lesson 8

    Java Collections
    Level 4, Lesson 8
    Available
  • Logger

    Java Collections
    Level 4, Lesson 9
    "Oh, there you are! Did you remember that we have another lesson today?" "No, I was just looking for you. Almost…" "Excellent, then let's start. Today I want to tell you about logging." "The log is a list of the events that have occurred. Almost like a ship's log or a diary. Or Twitter — maybe you can relate better to that. Unsurprisingly, a logger is an object that you use for logging ..."
    Available
  • Tasks | Level 4 | Lesson 10

    Java Collections
    Level 4, Lesson 10
    Available
  • Learning to google | Level 4 | Lesson 11

    Java Collections
    Level 4, Lesson 11
    "Hi, Amigo!" "Let's continue our lessons on how to google." "Here are some exercises ..."
    Available
  • 1
  • 2
Learn
  • Registration
  • Java Course
  • Help with Tasks
  • Pricing
  • Game Projects
  • Java Syntax
Community
  • Users
  • Articles
  • Forum
  • Chat
  • Success Stories
  • Activity
  • Affiliate Program
Company
  • About us
  • Contacts
  • Reviews
  • Press Room
  • CodeGym for EDU
  • FAQ
  • Support
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 Java developer’s career.
Follow us
Interface language
Programmers Are Made, Not Born © 2023 CodeGym
MastercardVisa
Programmers Are Made, Not Born © 2023 CodeGym
This website uses cookies to provide you with personalized service. By using this website, you agree to our use of cookies. If you require more details, please read our Terms and Policy.