Hashmap with Streams in Java 8
In this video, you’ll learn how to use HashMap with Java Streams — from the very basics to advanced transformations.
We’ll walk step-by-step through real examples of filtering, mapping, sorting, grouping, and collecting data efficiently using the Stream API in Java.
💡 Perfect for:
Java beginners learning Streams
Intermediate developers looking to master map transformations
Anyone preparing for coding interviews or backend developer roles
🧠 What you’ll learn:
✅ How to iterate over a HashMap using streams
✅ Filtering keys, values, and entries
✅ Mapping operations on keys, values, and entry sets
✅ Sorting a map by keys or values
✅ Collecting results into new maps
✅ Transforming values in a HashMap
✅ Grouping elements using Collectors.groupingBy()
✅ Summing map values using streams
✅ Finding the maximum value in a map
✅ Extracting the Top 2 maximum values
🚀 By the end of this video, you’ll understand how to write clean, concise, and functional-style code using Java Streams with HashMaps.