A HashMap is a data structure that stores key-value pairs, allowing fast lookup, insertion, and deletion. It uses a hash function to map each key to a bucket index, making access efficient.
Here’s how it works:
1. Keys are given to a HashMap 2. A hash function converts each key into a number that points to a bucket index that points to the data value. 3. When two keys map to the same bucket index, a collision occurs. 4. Collisions are handled by linking entries together in a chain within the same bucket. This is done using a linked list or even trees in some cases. 5. Finally, values are retrieved quickly by hashing the key and looking up the correct bucket.
Over to you: What else will you add to better understand the working of Hash Maps?
-- We just launched the all-in-one tech interview prep platform, covering coding, system design, OOD, and machine learning.
ByteByteGo
How Java HashMaps Work?
A HashMap is a data structure that stores key-value pairs, allowing fast lookup, insertion, and deletion. It uses a hash function to map each key to a bucket index, making access efficient.
Here’s how it works:
1. Keys are given to a HashMap
2. A hash function converts each key into a number that points to a bucket index that points to the data value.
3. When two keys map to the same bucket index, a collision occurs.
4. Collisions are handled by linking entries together in a chain within the same bucket. This is done using a linked list or even trees in some cases.
5. Finally, values are retrieved quickly by hashing the key and looking up the correct bucket.
Over to you: What else will you add to better understand the working of Hash Maps?
--
We just launched the all-in-one tech interview prep platform, covering coding, system design, OOD, and machine learning.
Launch sale: 50% off. Check it out: bit.ly/bbg-yt
#systemdesign #coding #interviewtips
.
1 week ago | [YT] | 1,468