Additional tasks are waiting in a queue. 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. The main difference between User and Daemon threads are what happens when they exit. newCachedThreadPool() creates the pool of threads. The Executor and ExecutorService interfaces are used to work with different thread pool implementations in Java. And finally, make a practice of using timeout parameters in blocking method calls. When the timeout of thread is over, that 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. A user thread continues its lifecycle even if the main thread exits. Similarly, while creating it’s instance, be mindful of the configured thread pool capacity. These can be used through executor interfaces or directly through thread pool implementations – which does allow for finer-grained control. 4. When JVM start it contains a single User thread, named Main thread. A fixed thread pool can be obtainted by calling the static newFixedThreadPool() method of Executors class. The old available threads will be reused for the new tasks. As there multiple threads are running in the application, there is a need for synchronization between threads. The scheduler selects one thread from the thread pool, and it starts executing in the application. This simple example may not demonstrate the full usefulness of using a custom Thread Pool, but the benefits become obvious in situations where we do not want to tie-up the common Thread Pool with long-running tasks (e.g. processing data from a network source), or the common Thread Pool is being used by other components within the application. A fixed thread pool is a very common type of thread pool that is frequently used in multi-threaded applications. First one is by extending the Thread class and second one is by implementing the Runnable interface. However all Daemon threads terminates when all the user threads exits. Syntax ExecutorService fixedPool = Executors.newFixedThreadPool(2); 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. Java Thread Types: User and Daemon Threads. Whenever a thread is needed, pool returns a thread from cache and if not available, a new thread is created for a short time. 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. Fixed thread pool: limits the maximum number of concurrent threads. Java Thread Pools. Waiting: This is the state when a thread has to wait. Creating a thread. Let's see the examples of creating a thread. Those classes are a good place to start with – use it if you don't need to apply any custom fine-tuning. newCachedThreadPool() is the method of java.util.concurrent.Executors class. 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. 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. The Executors helper class contains several methods for the creation of pre-configured thread pool instances for you. ... Java Thread Synchronization. Cached Thread Pool: A thread pool that creates as many threads it needs to execute the task in parrallel. 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