What are the best practices for using HashSet in Java?

What are the best practices for using HashSet in Java?

When using HashSet in Java, consider the following best practices: 1. Use it for unique elements. 2. Be mindful of the initial capacity and load factor for performance. 3. Avoid using mutable objects as elements.

Why should I avoid using mutable objects in a HashSet?

Using mutable objects can lead to unexpected behavior, as changes to the object's state can affect its hash code, causing issues with retrieval.

What is the difference between HashSet and TreeSet?

HashSet is unordered and allows null elements, while TreeSet is ordered and does not allow null elements. TreeSet also has a higher overhead due to sorting.

Can you give an example of initializing a HashSet?

Sure! You can initialize a HashSet like this: HashSet<String> set = new HashSet<>(); You can also specify the initial capacity and load factor.

How do I iterate over a HashSet?

You can iterate over a HashSet using an enhanced for loop: for (String item : set) { System.out.println(item); }.