How HashMap Actually Works Under the Hood 🤯. #java #programming
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How HashMap Actually Works Under the Hood 🤯. #java #programming
Here is the 3-step secret to its lightning-fast performance: 1️⃣ The HashCode: Java takes your Key, runs it through .hashCode(), and turns it into a giant number. 2️⃣ The Bucket: It uses a clever bitwise math trick to shrink that number into an index "a bucket" inside an internal array. 3️⃣ The Backup Plan: If two keys land in the ...
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