Original link:
http://www.cnblogs.com/morninglight/p/10339711.html
The role of the thread pool
Limit the number of execution threads in the system
Practice: using a thread pool controls the number of threads, other threads waiting in line.
Why use a thread pool
- Reducing the creation and destruction of threads
- The system can adjust the capacity of the number of threads, the system could not carry too much
Several important classes
- ExecutorService: thread pool Interface
- ScheduledExecutorService: TimeTask and similar, repetitive tasks performed
- ThreadPool: the default thread pool implementation
- ScheduledThreadPoolExecuter: periodic task scheduler implementation class
How to generate the thread pool
Executors class provides factory methods:
- newSingleThreadExecutor
- newFixedThreadExecutor
- newCachedThreadExecutor
- newScheuledThreadExecutor
For example
Create a fixed-size thread pool
...
ExecutorService threadPool = Executors.newFixedThreadPool(30);//创建具有30个线程的线程池
Runnable r1 = new Runable(){
public void run(){
//线程体
}
};
threadPool.execute(r1);//将任务交给线程池，其会分配空闲线程来运行这个任务。
...Reproduced in: https: //www.cnblogs.com/morninglight/p/10339711.html