OCP Oracle Certified Professional Java SE 11 Developer Complete Study Guide

Chapter 18Concurrency

OCP EXAM OBJECTIVES COVERED IN THIS CHAPTER:

• Concurrency
  • Create worker threads using Runnable, Callable and use an ExecutorService to concurrently execute tasks
  • Use java.util.concurrent collections and classes including CyclicBarrier and CopyOnWriteArrayList
  • Write thread‐safe code
  • Identify threading problems such as deadlocks and livelocks
• Parallel Streams
  • Develop code that uses parallel streams
  • Implement decomposition and reduction with streams

As you will learn in Chapter 19, “I/O,” Chapter 20 “NIO.2,” and Chapter 21, “JDBC,” computers are capable of reading and writing data to external resources. Unfortunately, as compared to CPU operations, these disk/network operations tend to be extremely slow—so slow, ...