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You put a value in a HashMap. You know it's there. But when you try to get it back… it's null. This isn't a Java bug. It's an equals() ...

In this video, we delve into the crucial concepts of `equals()` and `hashCode()` within Java's Collection Interface. Understanding ...

Learn Java Object class methods the right way! In this video, I break down toString(), equals(), and hashCode() with simple ...

Understanding why Java's HashSet.contains() might return false despite an element being equal, focusing on hashCode and ...

In this video, we take a deep dive into how HashMap works internally in Java 8. If you're preparing for Java interviews (2–5 years ...

In this video, I explain the most important Java concept: Why we override equals() and hashCode() What happens inside ...

DESCRIPTION* Explore the crucial `hashCode()` and `equals()` contract in Java. Learn why if two objects are equal, they *must* ...

Learn Sets in Java — and deeply understand how HashSet works internally! In this lecture of the Complete Java Course – From ...

Erkunden Sie die Nuancen der konsistenten Erzeugung von `Hash Codes` in Java mit Lombok und erfahren Sie, wie ...

Ever wondered why HashSet sometimes allows duplicate objects? In this video, I show why adding two identical objects into a ...

En este video explico qué son los Records en Java y por qué pueden ser una mejor opción que las clases tradicionales cuando ...

In Part 1 of this Lombok series, we deep-dive into Project Lombok and show how it dramatically reduces boilerplate code in ...

This content comes from the free preview portion of The World's Best Introduction to Test-Driven Development (TDD): Level 1.

Welcome back to CodeCraft with Poonam ‍ ! In today's session, we'll explore one of the most powerful parts of Java's ...

En este capitulo avanzamos desde poo, ...hasta tipos de datos genericos.

What Is the Contract Between equals() and hashCode()? | Core Java Interview Question Explained In this video, we explain one ...

Master Java HashMap for interviews and coding practice! In this video we cover: - HashMap basics in Java Collections ...

When you use a mutable object as a key inside a HashMap, changing the object's fields after inserting it into the map can break ...

Ever wondered why your hash table lookups sometimes fail to retrieve the data you expect? This video explores the common ...