MultiThreading Java Interview Questions

Question- What is a synchronized keyword and where we can apply it?

The synchronized keyword in Java is utilized to guarantee that only one Thread can execute a synchronized method or code block at any given time. its purpose is to provide mutual exclusion, preventing race conditions and data inconsistency. the synchronized keyword is commonly applied to methods or code block that involves accessing shared resources, ensuring Thread safety in such scenarios.

Question – Explain the advantage of synchronized keywords.

The synchronized keyword in Java offers several advantages in concurrent programming-

  • Thread safety
  • Mutual exclusion
  • Data consistency
  • Simplified cordination
  • Inherent memory visibility

Question – What is the disadvantage of synchronized keywords?

  • Performance overhead
  • Potential Deadlock
  • Lack of flexibilty
  • Difficulty in composition
  • Limited interoperability

Question- What is race condition?

If multiple Threads are operating simultaneously on the same Java objects then there may be a chance of data inconsistency problem. This is known as race condition we can overcome this problem by using synchronized keywords.

Question- What is object lock and when it is required?

In Java, an object lock represents the inherent lock or monitor associated with each object. It becomes necessary when the aim is to ensure exclusive access to synchronized methods or code blocks. By utilizing the lock, the execution of critical sections of code can be synchronized, thereby guaranteeing that only one thread can access the shared resource at any given moment. Its primary purpose is to prevent race conditions and uphold data integrity in concurrent programming.

Question- What is class level and when it is required?

In the context of Java, the term class level refers to variables and methods that are linked to the class itself, as supposed to specific objects or instances class level variables and methods that are accessible and shared by all instances of the class. The uses of class-level components become necessary in scenarios where there is a need to distribute data, handle condense or implement the singleton pattern.

Question- What is the difference between class-level lock and object-level lock?

The difference between class-level lock and object-level lock in Java is the way they are acquired and their impact. The class level lock is obtained on the class itself and applies to all instances, while the object level lock is acquired on a particular instance and permits simultaneous access by different Threads to different instances.

Question- What is a synchronized block?

A synchronized block in Java refers to a Code segment that guarantees mutual exclusion by permitting only one Thread to execute it at a time. the synchronized block is implemented using the synchronized keyword followed by the object used as a lock. The block offers precise control over synchronization within a method or code section, ensuring the safety of the concurrent Thread and preventing race conditions.

Question- How to declare a synchronized block to get the lock of the current object?

Question- How to declare a synchronized block to get a Class level lock?

Question- What is the advantage of the synchronized block over the synchronized method?

Question- Is a Thread can acquire multiple locks simultaneously?

Yes, a thread can acquire multiple locks simultaneously from different objects.

Question- What is synchronized statement?

The statement present in the synchronized method and synchronized block are called synchronized statements.

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