- The most important root interface in executor interface.
- It has only one method
void execute(Runnable task);
- Extends Executor interface.
- Provides an lifecycle to an executor i.e an initialization phase, service phase and destruction phase.
- Some of the methods provided by ExecutorService are
<T> Future <T> submit(Callable<T> task)
<T> Future <T> submit(Runnable<T> task)
- It is a factory class that constructs and returns various kinds of instances of ExecutorService with commonly used Executors setting.
- public static ExecutorsService newFixedThreadPool(int nThreads);
- Specifies the number of threads you want in the pool.
- public static ExecutorsService newCachedThreadPool(int nThreads);
- This kind of ExecutorsService keeps on creating thread until no thread is available
- public static ExecutorsService newSingleThreadExecutor();
- Background thread that executes one by one from a queue sequentially
- Never executes more than one thread simultaneously
- public static ExecutorsService newSingleThreadScheduledExecutor();
- Executes only one thread at a time.
- Can schedules the delay when the thread has to be executed.