java线程池ThreadPoolExecutor类使用小结

public ThreadPoolExecutor(int corePoolSize,
                              int maximumPoolSize,
                              long keepAliveTime,
                              TimeUnit unit,
                              BlockingQueue<Runnable> workQueue,
                              ThreadFactory threadFactory,
                              RejectedExecutionHandler handler) {
        if (corePoolSize < 0 ||
            maximumPoolSize <= 0 ||
            maximumPoolSize < corePoolSize ||
            keepAliveTime < 0)
            throw new IllegalArgumentException();
        if (workQueue == null || threadFactory == null || handler == null)
            throw new NullPointerException();
        this.acc = System.getSecurityManager() == null ?
                null :
                AccessController.getContext();
        this.corePoolSize = corePoolSize;
        this.maximumPoolSize = maximumPoolSize;
        this.workQueue = workQueue;
        this.keepAliveTime = unit.toNanos(keepAliveTime);
        this.threadFactory = threadFactory;
        this.handler = handler;
    }

public class ThreadPool {
    private static ExecutorService pool;
    public static void main( String[] args )
    {
        //maximumPoolSize设置为2 ，拒绝策略为AbortPolic策略，直接抛出异常
        pool = new ThreadPoolExecutor(1, 2, 1000, TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(),Executors.defaultThreadFactory(),new ThreadPoolExecutor.AbortPolicy());
        for(int i=0;i<3;i++) {
            pool.execute(new ThreadTask());
        }   
    }
}

public class ThreadTask implements Runnable{
    
    public ThreadTask() {
        
    public void run() {
        System.out.println(Thread.currentThread().getName());

pool = new ThreadPoolExecutor(1, 2, 1000, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(10),Executors.defaultThreadFactory(),new ThreadPoolExecutor.AbortPolicy());

pool = new ThreadPoolExecutor(1, 2, 1000, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(),Executors.defaultThreadFactory(),new ThreadPoolExecutor.AbortPolicy());

public class ThreadPool {
    private static ExecutorService pool;
    public static void main( String[] args )
    {
        //优先任务队列
        pool = new ThreadPoolExecutor(1, 2, 1000, TimeUnit.MILLISECONDS, new PriorityBlockingQueue<Runnable>(),Executors.defaultThreadFactory(),new ThreadPoolExecutor.AbortPolicy());
          
        for(int i=0;i<20;i++) {
            pool.execute(new ThreadTask(i));
        }    
    }
}

public class ThreadTask implements Runnable,Comparable<ThreadTask>{
    
    private int priority;
    public int getPriority() {
        return priority;
    public void setPriority(int priority) {
        this.priority = priority;
    public ThreadTask() {
        
    public ThreadTask(int priority) {
    //当前对象和其他对象做比较，当前优先级大就返回-1，优先级小就返回1,值越小优先级越高
    public int compareTo(ThreadTask o) {
         return  this.priority>o.priority?-1:1;
    public void run() {
        try {
            //让线程阻塞，使后续任务进入缓存队列
            Thread.sleep(1000);
            System.out.println("priority:"+this.priority+",ThreadName:"+Thread.currentThread().getName());
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

public class ThreadPool {
    private static ExecutorService pool;
    public static void main( String[] args )
    {
        //自定义拒绝策略
        pool = new ThreadPoolExecutor(1, 2, 1000, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(5),
                Executors.defaultThreadFactory(), new RejectedExecutionHandler() {
            public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
                System.out.println(r.toString()+"执行了拒绝策略");
                
            }
        });
          
        for(int i=0;i<10;i++) {
            pool.execute(new ThreadTask());
        }    
    }
}

public class ThreadTask implements Runnable{    
    public void run() {
        try {
            //让线程阻塞，使后续任务进入缓存队列
            Thread.sleep(1000);
            System.out.println("ThreadName:"+Thread.currentThread().getName());
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    

public class ThreadPool {
    private static ExecutorService pool;
    public static void main( String[] args )
    {
        //自定义线程工厂
        pool = new ThreadPoolExecutor(2, 4, 1000, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(5),
                new ThreadFactory() {
            public Thread newThread(Runnable r) {
                System.out.println("线程"+r.hashCode()+"创建");
                //线程命名
                Thread th = new Thread(r,"threadPool"+r.hashCode());
                return th;
            }
        }, new ThreadPoolExecutor.CallerRunsPolicy());
          
        for(int i=0;i<10;i++) {
            pool.execute(new ThreadTask());
        }    
    }
}

public class ThreadTask implements Runnable{    
    public void run() {
        //输出执行线程的名称
        System.out.println("ThreadName:"+Thread.currentThread().getName());

public class ThreadPool {
    private static ExecutorService pool;
    public static void main( String[] args ) throws InterruptedException
    {
        //实现自定义接口
        pool = new ThreadPoolExecutor(2, 4, 1000, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(5),
                new ThreadFactory() {
            public Thread newThread(Runnable r) {
                System.out.println("线程"+r.hashCode()+"创建");
                //线程命名
                Thread th = new Thread(r,"threadPool"+r.hashCode());
                return th;
            }
        }, new ThreadPoolExecutor.CallerRunsPolicy()) {
    
            protected void beforeExecute(Thread t,Runnable r) {
                System.out.println("准备执行："+ ((ThreadTask)r).getTaskName());
            }
            
            protected void afterExecute(Runnable r,Throwable t) {
                System.out.println("执行完毕："+((ThreadTask)r).getTaskName());
            }
            
            protected void terminated() {
                System.out.println("线程池退出");
            }
        };
          
        for(int i=0;i<10;i++) {
            pool.execute(new ThreadTask("Task"+i));
        }    
        pool.shutdown();
    }
}

public class ThreadTask implements Runnable{    
    private String taskName;
    public String getTaskName() {
        return taskName;
    }
    public void setTaskName(String taskName) {
        this.taskName = taskName;
    }
    public ThreadTask(String name) {
        this.setTaskName(name);
    }
    public void run() {
        //输出执行线程的名称
        System.out.println("TaskName"+this.getTaskName()+"---ThreadName:"+Thread.currentThread().getName());
    }
}

            Nthreads = Ncpu*Ucpu*(1+W/C)