1.ThreadPoolExecutor继承结构(具体可查API)
--Executor (interface)
--ExecutorService (interface)
--AbstractExecutorService (abstract class)
--ThreadPoolExecutor
2.ThreadPoolExecutor常用API
2.1 线程池实例化方法，共4个这里看最复杂的一个
public ThreadPoolExecutor(int corePoolSize,
int maximumPoolSize,
long keepAliveTime,
TimeUnit unit,
BlockingQueue<Runnable> workQueue,
ThreadFactory threadFactory,
RejectedExecutionHandler handler);
corePoolSize：核心线程数
maximumPoolSize：最大线程数
keepAliveTime：回收空闲线程的时间（默认回收大于核心线程数的部分）
unit：回收空闲线程时间的单位
workQueue：缓存队列，缓存尚未执行的Runnable
threadFactory：线程创建工程
handler：拒绝处理任务时的策略
2.2 execute执行线程
void execute(Runnable command);
2.3 shutdown执行完所有任务 关闭线程池
void shutdown();
注意：具体每一个参数使用参考官方文档
3.看看如下的小栗子
public class ThreadPoolTest {
public static void main(String[] args) {
ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 5, 1, TimeUnit.MINUTES, new LinkedBlockingDeque<>());
for (int index = 0; index < 30; index ++) {
threadPoolExecutor.execute(new Task(index));
}
threadPoolExecutor.shutdown();
}
}
class Task implements Runnable {
private int index;
public Task(int index) {
this.index = index;
}
@Override
public void run() {
System.out.println(index + "正在执行...");
try {
Thread.sleep(2000);
} catch (Exception e) {
}
System.out.println(index + "执行结束...");
}
}
4.一般来说我们不推荐直接使用ThreadPoolExecutor, 而是使用Executors创建线程池，例如
public static ExecutorService newSingleThreadExecutor();
public static ExecutorService newFixedThreadPool(int nThreads, ThreadFactory threadFactory);
public static ExecutorService newCachedThreadPool();
5.总结
线程池还有很多其他的API，也就不一一介绍，有空还是要多看看源码和API文档
