#Java

Find the K most frequent words in a list, sorted by frequency and lexicographical order.

Validate a custom expression containing '{', '}', and '*' where '*' can act as '{', '}', or empty. Check if it is balanced.

Why is it important to override the equals and hashCode methods in Java? Discuss scenarios where not doing so may lead to issues.

Using Java Stream API, write a method to identify repetitive elements within a list. Provide a rationale for your approach.

Given a specific scenario, write the service layer logic required for that scenario in a Spring Boot application. Explain your design choices.