ThreadPoolExecutor

 * @since 1.5
 * @author Doug Lea 大神的名字
 */
public class ThreadPoolExecutor extends AbstractExecutorService {
}

Executor

就规定了一个execute的方法,供实现类自己去实现

public interface Executor {

    /**
     * Executes the given command at some time in the future.  The command
     * may execute in a new thread, in a pooled thread, or in the calling
     * thread, at the discretion of the {@code Executor} implementation.
     *
     * @param command the runnable task
     * @throws RejectedExecutionException if this task cannot be
     * accepted for execution
     * @throws NullPointerException if command is null
     */
    void execute(Runnable command);
}

ExecutorService

在executor的基础上 增加了shutdown submit await等方法
先不去管都是干啥用的

void shutdown();
List<Runnable> shutdownNow();
boolean awaitTermination(long timeout, TimeUnit unit)
throws InterruptedException;
<T> Future<T> submit(Callable<T> task);
<T> Future<T> submit(Runnable task, T result);
Future<?> submit(Runnable task);
<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
throws InterruptedException;
<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks,
long timeout, TimeUnit unit)
throws InterruptedException;
<T> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException;
<T> T invokeAny(Collection<? extends Callable<T>> tasks,
long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException;

AbstractExecutorService

实现了ExecutorService里定义的方法,但没有实现execute方法

ThreadPoolExecutor

实现了execute方法,是主要分析对象,看看如何实现池的思想的