ThreadPoolExecutor的四个拒绝策略

下面是建立一个线程池的基本语法，最后一个参数是线程池的拒绝策略。Jdk默认实现了4个拒绝策略。在下面四张图片中可以看到。

ThreadPoolExecutor pool = new ThreadPoolExecutor(3,
				6,
				3000,
				TimeUnit.MILLISECONDS,
				new LinkedBlockingDeque(),
				new ThreadFactory(){
					@Override
					public Thread newThread(Runnable r) {
						ThreadGroup group = Thread.currentThread().getThreadGroup();
						Thread thread =new Thread(group, r, "Thread-"+count.getAndIncrement());
						return thread;
						}
					},
				new RejectedExecutionHandler() {
						@Override
						public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
							throw new RuntimeException("任务被拒绝");
					}
		});