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  • 使用线程池实现多线程

    newFixedThreadPool:线程池中指定固定线程个数来执行任务
    package com.roocon.thread.t2;
    
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    public class Demo6 {
    
        public static void main(String[] args) {
            ExecutorService threadPool = Executors.newFixedThreadPool(10);
            for(int i = 0; i < 10; i++){
                threadPool.execute(new Runnable() {
                    @Override
                    public void run() {
                        System.out.println(Thread.currentThread().getName()+" is executing");
                    }
                });
            }
        }
    }

    运行结果:

    pool-1-thread-1 is executing
    pool-1-thread-2 is executing
    pool-1-thread-3 is executing
    pool-1-thread-7 is executing
    pool-1-thread-4 is executing
    pool-1-thread-6 is executing
    pool-1-thread-5 is executing
    pool-1-thread-10 is executing
    pool-1-thread-9 is executing
    pool-1-thread-8 is executing
    newCachedThreadPool():刚开始线程池中先创建几个线程用着,如果线程池中有空闲的线程可以去执行任务,则不会创建新的线程,
    如果线程池中无可利用的线程,则会去创建新的线程。可以认为是智能的创建线程。
    package com.roocon.thread.t2;
    
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    public class Demo6 {
    
        public static void main(String[] args) {
            ExecutorService threadPool = Executors.newCachedThreadPool();
            for(int i = 0; i < 10; i++){
                threadPool.execute(new Runnable() {
                    @Override
                    public void run() {
                        System.out.println(Thread.currentThread().getName()+" is executing");
                    }
                });
            }
        }
    }

    运行结果:

    pool-1-thread-1 is executing
    pool-1-thread-3 is executing
    pool-1-thread-2 is executing
    pool-1-thread-4 is executing
    pool-1-thread-3 is executing
    pool-1-thread-1 is executing
    pool-1-thread-1 is executing
    pool-1-thread-4 is executing
    pool-1-thread-2 is executing
    pool-1-thread-5 is executing


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  • 原文地址:https://www.cnblogs.com/sunnyDream/p/8001173.html
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