23.6.1. java.util.concurrent.atomic Package

Try these first

1. 1.

   What does the AtomicInteger class do?

   Hint

   Think about operations that need to be safe in a multi-threaded context.

2. 2.

   Name two classes in the java.util.concurrent.atomic package.

   Hint

   Recall the classes that handle specific data types.

3. 3.

   What is the purpose of the java.util.concurrent.atomic package?

   • To provide synchronized collections
   • To offer lock-free operations on variables
   • To manage memory efficiency

   Hint

   Consider what 'lock-free' means in the context of threading.

4. 4.

   True or False: The compareAndSet() method guarantees that a variable will always be updated.

   • True
   • False

   Hint

   Reflect on what 'compare' indicates about the operation.

5. 5.

   Design a multi-threaded application to simulate a stock trading system where multiple traders can update their balances concurrently using AtomicInteger.

   Hint

   Consider how transactions will be managed.

6. 6.

   Create an application that tracks the number of visitors to a website using AtomicLong. Ensure that the counting is thread-safe as multiple requests come in at the same time.

   Hint

   Focus on where the count needs to be updated.