Practice Key Concepts In The Jmm (20.2) - Java Memory Model and Thread Safety

Practice: Key Concepts in the JMM

Lesson 20.2Java Memory Model and Thread Safety

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11 questions

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3 cards from this section. Quick, good the night before a test.
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6 sample questions

Question 1.
What does it mean when a variable is declared volatile?
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Think about visibility and shared access.
Question 2.
Are simple read and write operations atomic in Java?
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Focus on basic data types.
3Question 3.
What is the effect of declaring a variable as volatile?
- Changes to the variable are visible to all threads immediately.
- The variable cannot be modified once set.
- Only one thread can access the variable at a time.
- It does not affect how other threads see the variable.
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Think about how visibility operates with volatile variables.
4Question 4.
True or False: Atomic operations can be interrupted.
- True
- False
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Consider what makes operations atomic.
Question 5.
Implement a scenario using Java threading where race conditions could occur. Describe how you would mitigate the race condition.
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Think about areas where shared data might be changed by multiple threads.
6Question 6.
Analyze the following Java code snippet:
Java
public class Counter { private int count = 0; public void increment() { count++; } }
What are the potential issues, and how would you resolve them?
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Consider solutions that enforce mutual exclusion.

7 more questions in this section. Enroll free to practise them all.