When JVM start it contains a single User thread, named Main thread. There are two ways to create a thread in java. Java provides its own implementations of the thread pool pattern, through objects called executors. Here or any other implementation, a careless threads pool size can halt the system and bring performance down. A thread is in the blocked state when it tries to access a protected section of code that is currently locked by some other thread. The Java Concurrency API supports the following types of thread pools: Cached thread pool: keeps a number of alive threads and creates new ones as needed. Additional tasks are waiting in a queue. newCachedThreadPool() creates the pool of threads. Similarly, while creating it’s instance, be mindful of the configured thread pool capacity. 4. Whenever a thread is needed, pool returns a thread from cache and if not available, a new thread is created for a short time. Let's see the examples of creating a thread. The main difference between User and Daemon threads are what happens when they exit. The scheduler selects one thread from the thread pool, and it starts executing in the application. Creating a thread. A fixed thread pool can be obtainted by calling the static newFixedThreadPool() method of Executors class. Cached Thread Pool: A thread pool that creates as many threads it needs to execute the task in parrallel. newCachedThreadPool() is the method of java.util.concurrent.Executors class. The Executor and ExecutorService interfaces are used to work with different thread pool implementations in Java. When the timeout of thread is over, that thread … ... Java Thread Synchronization. Usually, you should keep your code decoupled from … A fixed thread pool is a very common type of thread pool that is frequently used in multi-threaded applications. When the protected section is unlocked, the schedule picks one of the thread which is blocked for that section and moves it to the runnable state. Java Thread Types: User and Daemon Threads. processing data from a network source), or the common Thread Pool is being used by other components within the application. the executors class contains factory methods for creating different types of thread pools, while executor is the simplest thread pool interface, with a single execute() method. These can be used through executor interfaces or directly through thread pool implementations – which does allow for finer-grained control. The java.util.concurrent package contains the following interfaces: First one is by extending the Thread class and second one is by implementing the Runnable interface. The Executors helper class contains several methods for the creation of pre-configured thread pool instances for you. Syntax ExecutorService fixedPool = Executors.newFixedThreadPool(2); A user thread continues its lifecycle even if the main thread exits. And finally, make a practice of using timeout parameters in blocking method calls. Executing Task2 inside : pool-1-thread-2 Executing Task1 inside : pool-1-thread-1 Executing Task3 inside : pool-1-thread-1 In the example above, we created an executor service with a fixed thread pool of size 2. Those classes are a good place to start with – use it if you don't need to apply any custom fine-tuning. Waiting: This is the state when a thread has to wait. However all Daemon threads terminates when all the user threads exits. Fixed thread pool: limits the maximum number of concurrent threads. The old available threads will be reused for the new tasks. 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