How to add Single Key and Multiple Values to the HashMap? | Java Collection Framework

Welcome to our Java Collections tutorial! In this video, we'll explore a common scenario in Java programming: adding multiple values to a single key in a HashMap. If you're eager to expand your knowledge of the Java Collection Framework and HashMaps, you're in the right place!

**What You'll Learn:**
- Introduction to HashMaps and the Java Collection Framework
- Understanding the need for associating multiple values with a single key
- Step-by-step guide on adding multiple values to a single key in a HashMap
- Practical examples and coding demonstrations to illustrate the concept
- Best practices and tips for efficiently working with HashMaps and multiple values

**Why This is Important:**
HashMaps are an essential component of the Java Collection Framework, providing a versatile way to store and retrieve data. Knowing how to associate multiple values with a single key in a HashMap expands your ability to model complex relationships in your Java programs, making them more robust and scalable.

By the end of this video, you'll have gained a solid understanding of how to effectively add single keys with multiple values to a HashMap, empowering you to write more efficient and expressive Java code.

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How to add Single Key and Multiple Values to the HashMap? | Java Collection Framework

Java Source Code here:

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[kk-transport]

How would this work if you would like to group by a certain attribute for example the category of an item?

[rajadaimari]

if the key and values are stored in a text file. how to get the values of a key?

[rohitbhujbal]

sort the rows in it by ascending order of row numbers and the elements in each row alphabetically. Also note that after ordering the rows, if an element exists in an earlier row then it should be omitted.

eg:-12 - Blue, Green, Red, Orange, Purple
16 - White, Black, Yellow, Blue, Pink
14 - Yellow, Brown, Grey, Maroon, Green
20 - Red, Black, Yellow, Peach, Aqua
7 - White, Cream, Grey, Green, Magenta