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3.1 HashMap Internal Buckets & Red-Black Treeification
Topic Summary
Master HashMap capacity, load factor (0.75), bucket collision handling, and the Java 8+ TREEIFY_THRESHOLD (8).
What You Will Learn
• Understand how HashMap hashes keys: `(n - 1) & hash`.
• Explain what happens when collisions exceed 8 (`TREEIFY_THRESHOLD = 8`).
• Understand why `loadFactor = 0.75` balances time and memory.
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