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HashMap in Java stores data in key–value pairs for fast access In this video, learn how HashMap works and when to use it.

In this video, DSA in Java – HashMap 02, we cover important concepts of HashMap in Java as part of the Java in One Shot series.

Welcome to Debug Duck, Learn software engineering, programming, and technology in a simple and practical way. Tips, insights ...

Yes, you can use a custom object as a key in HashMap — but only if you follow two critical rules ⚠️ In this video, you'll learn: ...

HashMap in java 27.

Many Java developers know TreeMap is slower than HashMap, but do you know why? In this video, you'll learn: ✓ Internal ...

Using a mutable object as a key in HashMap can silently break your code In this video, you'll learn: ✓ What a mutable key is ...

Choosing the wrong Map in Java can silently kill performance or break your multithreaded code ⚠️ In this video, we deep-dive ...

Java HashMap Explained from Scratch — Internals Made Easy In this video, I explain how Java HashMap works internally ...

The load factor in HashMap looks simple… but it hides a big trade-off ⚖️ In this video, you'll learn: ✓ What load factor actually ...

Ride for Java lovers on HashMaps, keys, and lightning lookups.

In this video, we solve the Two Sum problem (LeetCode 1) and explain both the brute force and optimized HashMap approaches ...

In this video, we solve the Majority Element problem (LeetCode 169) using Java. We start with the Brute Force approach using ...

Why does ConcurrentHashMap NOT allow null keys or null values, while HashMap does?

Using a mutable key in HashMap can silently break your application The solution is to make the key immutable In this video, ...

Hash set and Hash map difference in java.

Learn how to solve the "Subarray Sum Equals K" problem (LeetCode 560) using the optimized Prefix Sum and HashMap ...

Most Java developers fail this simple-looking question If HashMap.get(key) returns null, does it mean the key doesn't exist?

In this video of code decode we have explained most asked java tricky interview questions which developers fails to answers ...