Kotlin

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Last Update	09/16/2026
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Section 3: Null Safety

5Lessons ·
- 15: Platform Types and Java Interop
  
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Section 4: Object-Oriented Kotlin

8Lessons ·
- 21: Sealed Classes and Sealed Interfaces
  
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Section 9: Interop and Tooling

4Lessons ·
- 48: Calling Java from Kotlin and Vice Versa
  
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Section 14: Interview Practice

3Lessons ·
- 70: Comparing Kotlin Idioms to Java Equivalents
  
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Section 15: More Practice Exercises

4Lessons ·
Section 31: Kotlin Type System Deep Dive

6Lessons ·
- 146: Star Projections in Generics
  
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Section 32: Kotlin Null Safety Advanced

4Lessons ·
- 150: Nullability Annotations for Java Interop
  
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Section 36: Kotlin Performance Considerations

5Lessons ·
- 168: Avoiding Boxing with Primitive Arrays
  
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Section 40: More Android-Adjacent Patterns

4Lessons ·
- 188: WorkManager for Background Tasks
  
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Section 46: Kotlin Annotations Deep Dive

4Lessons ·
- 216: Retention Policies for Custom Annotations
  
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- 217: Building a Custom Annotation Processor
  
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Section 47: Kotlin for Gradle Plugin Development

3Lessons ·
- 219: Testing Gradle Plugins
  
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- 220: Publishing Gradle Plugins to the Portal
  
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Section 48: Kotlin Concurrency Beyond Coroutines

3Lessons ·
- 221: Java Concurrency Utilities from Kotlin
  
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Section 50: Real-World Kotlin Case Studies

4Lessons ·
- 228: Migrating a Java Codebase to Kotlin Incrementally
  
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- 229: Common Java-to-Kotlin Interop Pitfalls
  
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