006 thread pool

I. Overview

We know that the creation cost of threads is relatively large, so we can also introduce the concept of pools to help realize the concept of resource reuse.

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2. Basic use of thread pool

    public  static  void main(String[] args) {
         // Create a thread pool 
        ExecutorService threadPool = Executors.newCachedThreadPool();
         // Add tasks to the thread pool 
        for ( int i = 0 ; i < 10 ; i++ ) {
            threadPool.execute(() -> {
                    System.out.println(Thread.currentThread().getName());
            });
        }
        // Close the thread pool 
        threadPool.shutdown();
    }

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3. Common thread pools

　　CacheThreadPool : Buffered thread pool

　　fixThreadPool : fixed size thread pool

　　Singleton : A thread pool for a single thread.

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4. Summary

　　Here is just a simple use of the thread pool, and the thread pool will be analyzed in detail later.