03A Java Certification Course 17
📚 Java Certification Course 17 - Session 03A
Java Certification Course 17 (Preparing for version 21)
Code: https://github.com/cursosmrugerio/cur...
Have a great day everyone! In this session, we continue our Java 17 certification preparation course, where we also prepare for the upcoming Java 21 certification.
🎯 *What will we cover in this session?*
📖 *Review of Fundamental Concepts*
Review of imports and package management
Instance variables vs. class variables
Default values for primitives and objects
🔢 *Primitives in Depth*
Capabilities and limitations of primitive types
Type casting rules
Autoboxing and unboxing: when and how they work
Common pitfalls in certification exams
📝 *Text Blocks*
New Java functionality for handling multiline strings
Special escape characters (\s, \\)
Comparison with traditional concatenation methods
🔄 *Keyword `var`*
Compile-time type inference
Limitations and usage rules
Is `var` a reserved word? (Spoiler: No)
🗑️ *Garbage Collection*
How the garbage collector works
Myths and realities about `System.gc()`
Objects eligible for collection
🧠 *Reference Variables and Diagrams*
Step-by-step analysis with visual diagrams
Memory management and object references
Solved practice exercises
⚡ *Initialization Blocks*
Execution order: static vs. instance
Initialization blocks vs. constructors
Complex execution order exercises
💡 *Exam Tips*
Strategies for complex questions (mark and solve at the end)
Using paper and pencil during the exam (if allowed)
Identifying common pitfalls
🔗 *Resources Mentioned*
ETW book for Java 17 (available) (on Amazon)
Supplementary videos on the channel about autoboxing/unboxing
Repository with example code
⏰ *Timestamps*
00:00 - Introduction and preparation for Java 21
02:37 - Primitives and capabilities exercises
17:12 - Garbage Collection and System.gc()
24:08 - Text Blocks in detail
38:33 - The `var` keyword and its rules
47:35 - Autoboxing and Unboxing explained
1:25:28 - Reference variables with diagrams
1:39:04 - Complex initialization blocks
🎓 *About the Course*
This course is designed to successfully prepare you for the Java 17 certification, with content that will also be useful for Java 21 (it is estimated that 90% of the content will be similar).
📊 *Java 17 Exam Facts*
Average time per question: less than 2 minutes
Recommended strategy: save complex questions for last
Focus on understanding concepts, not just memorization
💬 *Questions?*
Leave them in the comments! I always check and answer questions from the community.
🔔 *Don't forget*
✅ Subscribe to the channel
👍 Like if the content helps you
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📤 Share with other Java developers
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🏷️ *Tags:*
#Java #Java17 #Certification #OracleJava #Programming #Development #JavaCertification #Primitives #TextBlocks #GarbageCollection #Var #Autoboxing #JavaTutorial
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*Let's keep learning Java together! 🚀*
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