Effective Java with Groovy & Kotlin
summary
Shows concrete replacements for boilerplate: Groovy uses @EqualsAndHashCode, @Immutable and @Delegate AST transformations to generate equals/hashCode, final fields and delegation at compile time while Kotlin uses data class, nonnullable types and `by` delegation to get the same results. Demonstrates Groovy's null object that returns empty collections instead of NPEs and Kotlin's compile‑time nullable checks, compares collect/map/fold idioms, warns that compiler generated code beats IDE generation, and shows these features actually prevent common bugs.
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chapters (17)
- 0:00Introduction
- 1:19JVM as polyglot platform
- 2:25Effective Java’s influence
- 4:11Examples in Groovy/Kotlin
- 6:21Overriding equals in Groovy
- 12:45equals/hashCode in Kotlin
- 15:40Prefer internal iterators
- 18:50Null object pattern in Groovy
- 21:43Kotlin null safety
- 23:29Minimizing mutability in Groovy with AST transformations
- 26:44Immutable classes in Kotlin
- 28:32Composition over inheritance
- 31:21Kotlin delegation
- 32:46Compiler vs IDE code
- 34:33Idiomatic practices
- 35:36Learning languages improves Java
- 36:39Q&A
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