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Today we are going through Java Multithreading Questions and Answers. We will also look at questions and answers related to concurrency discussions, because multithreading and concurrency go hand in hand. Thread is one of the most popular topics in Java interview questions. Here I am writing the most important Java interview questions from the interview questions but you must have knowledge of Java thread to answer the following questions.
Multithreading Interview Questions And Answers For Experienced In Java
That’s all for Java Thread and Concurrency interview questions, I’ve added more to this list. So save this post for future reference.
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Hello Sir, Question asked How can one instance be shared with 100 users if we have only 1 db of instance. I can’t find clear answers. Please share what you know about this. Thank you
Please add Difference between sleeping and waiting? many asked. Please make changes based on feedback that makes it more effective
Hi, Pankaj Thanks for your site and all your articles I have a question about Callable feature You said “Executors… are the only class that supports Callable implementation” And I saw FutureTask’s post where you also used Callable. appearance. So there are two ways to set up a simple interface: – Executors – FutureTask Do you agree?
Thanks for sharing the questions and answers. I believe you missed the point or misspelled the point. “Synchronized block is the best method because it doesn’t lock the object, synchronized methods lock the object” As far as I know, when keyword is used, evaluation is affected, whether it is method or block level. If the block is connected, the lock must be explicitly defined, whereas, if the method is connected, the lock is used implicitly.
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Hello sir i have 10 threads not using synchronization and any requirement how can we run 10 threads in parallel. Please answer me. Multithreading refers to multiple threads and is considered one of the most important features of Java. As the name suggests, it is the ability of the CPU to create multiple independent threads at the same time, but share the resources that are being used at the same time. Its main purpose is to provide simultaneous access to multiple threads in order to use CPU time as much as possible. It is a part of Java where one can divide the program into two or more stacks to make the program run faster and easier.
A thread is a lightweight and very small part of the design that can be handled independently by the designer. Threads are called parts of a process that only allow a program to run concurrently with other parts or threads of the process. By using thread, one can do complex tasks in a simple way. This is considered the easiest way to use multiple CPUs available on the system. They share a common address space and are independent.
Threads: It refers to the smallest groups that we make. It has the ability to execute different parts (called threads) of a program at the same time.
Process: It simply refers to a program that is in progress, i.e. an active program. Process can be controlled by PCB (Process Control Block).
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Among these, thread communication is faster, cheaper, simpler and more efficient because the threads share the same address of the processor.
Among these, inter-channel communication is slow, expensive and difficult because each channel has a memory space or address.,
Threads are parts of a process, so they depend on each other, but each thread works independently.
Class Lock: In Java, every class has a unique lock which is often called a class lock. These locks are achieved using the ‘statically synchronized’ keyword and can be used to make static data thread safe. This is often used when one wants to prevent multiple threads from entering a linked block.
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Object Lock: In Java, every object has a unique lock which is often called an object lock. These locks are achieved using the ‘sync’ keyword and can be used to protect static data. This is often used when one wants to synchronize a non-static method or block so that only one thread can execute a block of code on another part of the class.
User and Daemon are basically two types of threads which are implemented in Java using ‘Thread Class’.
User thread (non-Daemon thread): In Java, a user thread has a specific lifetime and its lifetime is independent of any other thread. The JVM (Java Virtual Machine) waits for each user thread to complete its tasks before terminating it. When the user thread terminates, the JVM terminates the entire program along with the associated daemon thread.
Daemon thread: In Java, a daemon thread is called a helper that provides support and assistance to user threads. There are two methods available in the daemon thread class: setDaemon() and isDaemon().
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This thread is called a low-level thread, so it is very important to support background tasks such as garbage collection, freeing memory from unused objects, etc.
We can create a daemon thread in java using thread setDaemon(true). This is used to set an existing thread as a daemon thread or a user thread. The isDaemon() method is often used to check whether the current thread is a daemon or not. If the thread is a daemon, it will return true otherwise it will return false.
But one can only call the setDaemon() method before the start() method otherwise it will throw IllegalThreadStateException as below:
Wait(): As the name suggests, this is a static method that causes the current thread to wait and sleep until another thread calls the notify() or notifyAll() method of the project object (lock). They only release the lock and are mostly used for wiring. It is defined in the object class, and must be called from the associated context.
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Sleep(): As the name suggests, this is a static method that pauses or suspends the execution of the current thread for a specified period of time. It does not release a lock while waiting and is often used to stop execution. It is defined in the thread class and does not need to be called from the linked context.
Notify(): Sends a notification and wakes up a single thread instead of multiple threads waiting on the object’s project.
NotifyAll(): This sends a notification and wakes up all threads and allows them to compete with the object’s project instead of a single thread.
We know that every object has an identifier that allows a thread to hold a lock on the object. But the thread group has no monitors. A thread usually waits on the object’s monitor (lock) by calling the wait() method on the object, and notifies other threads waiting on the same lock using the notify() or notifyAll() method. Therefore, these three methods are only called on objects and allow all threads to communicate with everyone created on the object.
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Both of these interfaces are used to combine tasks to be performed by other threads. But there are differences between them as below:
Running Interface: This interface is available in Java from the beginning. They are only used to generate code on the same thread.
Callable Interface: This interface is a new interface that is introduced as part of the package being used. It solves the limitation of interfaces that can be used together with other key variables such as generics, enums, static imports, variable method arguments, etc. It uses generics to define the return type of the object.
Start (): In simple terms, the start () method is used to start or start a newly created thread. When the start() method is called, a new thread is created and this newly created thread executes the work that is being done in the run() method. One can call the start() method only once.
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Run(): In simple terms, the run() method is used to start or start the same thread. When the run() method is called, no new thread is created as in the start() method. This method is handled by the current thread. One can call the run() method multiple times.
A thread package is simply a list of threads that have already been started or that are working on startup that can be used to execute a task and put back into the pool when it is finished. This is called a thread pool in which a group of fixed threads is created. By reducing the number of threads in use and improving their lifetime, one can reduce the performance problem of using the thread pool. Using threads can improve and improve performance
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