An instance of HashMap has two parameters that affect its performance: initial capacity and load factor. The capacity is the number of buckets in the hash table, and the initial capacity is simply the capacity …

It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value.

Nov 27, 2025 · A HashMap is a part of Java’s Collection Framework and implements the Map interface. It stores elements in key-value pairs, where, Keys are unique. and Values can be duplicated. …

Jan 16, 2025 · In this section, we’ll look at how HashMap works internally and what are the benefits of using HashMap instead of a simple list, for example. As we’ve seen, we can retrieve an element from …

Nov 12, 2025 · This blog post will delve into the fundamental concepts of the Java HashMap API, explain how to use it, share common practices, and provide best practices for efficient usage.

Learn how to efficiently use Java HashMap for storing key-value pairs with examples, syntax, and best practices. Improve performance and understand key features and usage scenarios.

Constructs a new HashMap with the same mappings as the specified Map. The HashMap is created with default load factor (0.75) and an initial capacity sufficient to hold the mappings in the specified Map.