Unlocking Java's Code Maze
summary
Series of live Java puzzles demonstrates concrete outcomes not abstractions: static-init order yields 20, a partitioning-by with a regex-vowel test returns the expected buckets, replacing a for-loop with parallelStream speeds grouping in that benchmark, raw generics and type erasure cause a ClassCastException when a raw Box holds an Integer, "result is 16" exemplifies string-plus precedence (1 + 2*3), ConcurrentHashMap.merge across two threads totals 2000, AtomicInteger increments to 2, nested sealed types produce a compilation error, and skip(3).limit(4) yields 4,5,6,7.
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chapters (16)
- 0:00Java code maze navigation
- 3:05Interactive coding challenges
- 5:14Static initialization order
- 8:09Stream partitioning with vowels
- 10:37Optimizing list grouping
- 14:06Generics type erasure pitfalls
- 17:45String concatenation precedence
- 20:38Nested streams flatMap
- 22:25ConcurrentHashMap merge atomicity
- 25:24AtomicInteger thread-safe increments
- 27:44Sealed classes inheritance
- 33:06Records equals comparison
- 35:34Immutable list restrictions
- 37:36Stream skip and limit
- 39:43CompletableFuture optimization
- 43:21Summary
