How does the 'equals' method affect performance in Java?

How does the 'equals' method affect performance in Java?

The 'equals' method can impact performance, especially in collections. It determines object equality, which can affect search and retrieval times.

Can you explain how it works with HashMap?

In a HashMap, the 'equals' method is used to check if two keys are the same. If it’s inefficient, it can slow down operations like get and put.

What are some best practices for implementing 'equals'?

Best practices include ensuring symmetry, transitivity, and consistency. Always override 'hashCode' when you override 'equals'.

Are there performance differences between '==' and 'equals'?

Yes, '==' checks for reference equality, while 'equals' checks for logical equality. Using '==' can be faster but may not yield the correct result.