Mastering Java 2026 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

The java.util.concurrent library was introduced in Java SE5 specifically to provide classes for concurrency problems. It contains a set of classes that help manage separate threads of execution that may have the potential to cause issues such as deadlocks and race conditions.

Option A, java.util, is a library that provides data structures and utilities for handling collections, such as lists, queues, and maps. While it does include some concurrency-related classes, it was not specifically created to address concurrency problems, making it incorrect.

Option C, java.io, is a library that provides classes for handling input and output operations, such as reading and writing files. It does not include any classes related to concurrency, making it incorrect.

Option D, java.nio, is a library that provides an alternative to java.io for handling input and output operations. While it does include some classes for handling multiple threads, it was not