23.1.1. What is the Java Memory Model?

Try these first

1. 1.

   What is the purpose of the Java Memory Model?

   Hint

   Think about how threads communicate.

2. 2.

   Explain the happens-before relationship.

   Hint

   Consider what happens first in multithreading.

3. 3.

   What does the Java Memory Model ensure?

   • Visibility of thread operations
   • Method Overloading
   • Runtime Exception Handling
   • Code Compilation Order

   Hint

   Focus on how threads communicate.

4. 4.

   True or False: The happens-before relationship guarantees that one thread’s changes will always be visible to another thread.

   • True
   • False

   Hint

   Think about the order of thread execution.

5. 5.

   You have two threads modifying a shared integer without synchronization. Predict the possible outcomes and explain the JMM's role in preventing inconsistencies.

   Hint

   Consider how the order of operations can influence results.

6. 6.

   Write a code snippet that illustrates how memory visibility issues can arise without proper synchronization. Then, suggest a solution that adheres to JMM principles.

   Hint

   Focus on ensuring proper communication between threads.