Java

Java is one of the most commonly used interview languages, especially at large companies with backend and enterprise codebases. Its type system is verbose but explicit, and the standard library is comprehensive with well-documented data structures including priority queues, linked lists, and tree maps. Java forces you to think about types and interfaces clearly, which can actually help structure your thinking on harder problems. The main downside for interview prep is boilerplate: simple operations require more lines than in Python or Ruby. If Java is your primary language, it is a strong and widely accepted choice.