java 中线程池的种类，原理以及源码解析(1)

java 中的线程池创建都是Executors 类中提供的方法，并且方法返回线程池对象。

Executors 源码：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package java.util.concurrent;import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;public class ThreadPoolExecutor extends AbstractExecutorService {private final AtomicInteger ctl;private static final int COUNT_BITS = 29;private static final int CAPACITY = 536870911;private static final int RUNNING = -536870912;private static final int SHUTDOWN = 0;private static final int STOP = 536870912;private static final int TIDYING = 1073741824;private static final int TERMINATED = 1610612736;private final BlockingQueue<Runnable> workQueue;private final ReentrantLock mainLock;private final HashSet<ThreadPoolExecutor.Worker> workers;private final Condition termination;private int largestPoolSize;private long completedTaskCount;private volatile ThreadFactory threadFactory;private volatile RejectedExecutionHandler handler;private volatile long keepAliveTime;private volatile boolean allowCoreThreadTimeOut;private volatile int corePoolSize;private volatile int maximumPoolSize;private static final RejectedExecutionHandler defaultHandler = new ThreadPoolExecutor.AbortPolicy();private static final RuntimePermission shutdownPerm = new RuntimePermission("modifyThread");private static final boolean ONLY_ONE = true;private static int runStateOf(int var0) {return var0 & -536870912;}private static int workerCountOf(int var0) {return var0 & 536870911;}private static int ctlOf(int var0, int var1) {return var0 | var1;}private static boolean runStateLessThan(int var0, int var1) {return var0 < var1;}private static boolean runStateAtLeast(int var0, int var1) {return var0 >= var1;}private static boolean isRunning(int var0) {return var0 < 0;}private boolean compareAndIncrementWorkerCount(int var1) {return this.ctl.compareAndSet(var1, var1 + 1);}private boolean compareAndDecrementWorkerCount(int var1) {return this.ctl.compareAndSet(var1, var1 - 1);}private void decrementWorkerCount() {while(!this.compareAndDecrementWorkerCount(this.ctl.get())) {;}}private void advanceRunState(int var1) {int var2;do {var2 = this.ctl.get();} while(!runStateAtLeast(var2, var1) && !this.ctl.compareAndSet(var2, ctlOf(var1, workerCountOf(var2))));}final void tryTerminate() {while(true) {int var1 = this.ctl.get();if (isRunning(var1) || runStateAtLeast(var1, 1073741824) || runStateOf(var1) == 0 && !this.workQueue.isEmpty()) {return;}if (workerCountOf(var1) != 0) {this.interruptIdleWorkers(true);return;}ReentrantLock var2 = this.mainLock;var2.lock();try {if (!this.ctl.compareAndSet(var1, ctlOf(1073741824, 0))) {continue;}try {this.terminated();} finally {this.ctl.set(ctlOf(1610612736, 0));this.termination.signalAll();}} finally {var2.unlock();}return;}}private void checkShutdownAccess() {SecurityManager var1 = System.getSecurityManager();if (var1 != null) {var1.checkPermission(shutdownPerm);ReentrantLock var2 = this.mainLock;var2.lock();try {Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();var1.checkAccess(var4.thread);}} finally {var2.unlock();}}}private void interruptWorkers() {ReentrantLock var1 = this.mainLock;var1.lock();try {Iterator var2 = this.workers.iterator();while(var2.hasNext()) {ThreadPoolExecutor.Worker var3 = (ThreadPoolExecutor.Worker)var2.next();var3.interruptIfStarted();}} finally {var1.unlock();}}private void interruptIdleWorkers(boolean var1) {ReentrantLock var2 = this.mainLock;var2.lock();try {Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();Thread var5 = var4.thread;if (!var5.isInterrupted() && var4.tryLock()) {try {var5.interrupt();} catch (SecurityException var15) {;} finally {var4.unlock();}}if (var1) {break;}}} finally {var2.unlock();}}private void interruptIdleWorkers() {this.interruptIdleWorkers(false);}final void reject(Runnable var1) {this.handler.rejectedExecution(var1, this);}void onShutdown() {}final boolean isRunningOrShutdown(boolean var1) {int var2 = runStateOf(this.ctl.get());return var2 == -536870912 || var2 == 0 && var1;}private List<Runnable> drainQueue() {BlockingQueue var1 = this.workQueue;ArrayList var2 = new ArrayList();var1.drainTo(var2);if (!var1.isEmpty()) {Runnable[] var3 = (Runnable[])var1.toArray(new Runnable[0]);int var4 = var3.length;for(int var5 = 0; var5 < var4; ++var5) {Runnable var6 = var3[var5];if (var1.remove(var6)) {var2.add(var6);}}}return var2;}private boolean addWorker(Runnable var1, boolean var2) {while(true) {int var3 = this.ctl.get();int var4 = runStateOf(var3);if (var4 >= 0 && (var4 != 0 || var1 != null || this.workQueue.isEmpty())) {return false;}while(true) {int var5 = workerCountOf(var3);if (var5 >= 536870911 || var5 >= (var2 ? this.corePoolSize : this.maximumPoolSize)) {return false;}if (this.compareAndIncrementWorkerCount(var3)) {boolean var18 = false;boolean var19 = false;ThreadPoolExecutor.Worker var20 = null;try {var20 = new ThreadPoolExecutor.Worker(var1);Thread var6 = var20.thread;if (var6 != null) {ReentrantLock var7 = this.mainLock;var7.lock();try {int var8 = runStateOf(this.ctl.get());if (var8 < 0 || var8 == 0 && var1 == null) {if (var6.isAlive()) {throw new IllegalThreadStateException();}this.workers.add(var20);int var9 = this.workers.size();if (var9 > this.largestPoolSize) {this.largestPoolSize = var9;}var19 = true;}} finally {var7.unlock();}if (var19) {var6.start();var18 = true;}}} finally {if (!var18) {this.addWorkerFailed(var20);}}return var18;}var3 = this.ctl.get();if (runStateOf(var3) != var4) {break;}}}}private void addWorkerFailed(ThreadPoolExecutor.Worker var1) {ReentrantLock var2 = this.mainLock;var2.lock();try {if (var1 != null) {this.workers.remove(var1);}this.decrementWorkerCount();this.tryTerminate();} finally {var2.unlock();}}private void processWorkerExit(ThreadPoolExecutor.Worker var1, boolean var2) {if (var2) {this.decrementWorkerCount();}ReentrantLock var3 = this.mainLock;var3.lock();try {this.completedTaskCount += var1.completedTasks;this.workers.remove(var1);} finally {var3.unlock();}this.tryTerminate();int var4 = this.ctl.get();if (runStateLessThan(var4, 536870912)) {if (!var2) {int var5 = this.allowCoreThreadTimeOut ? 0 : this.corePoolSize;if (var5 == 0 && !this.workQueue.isEmpty()) {var5 = 1;}if (workerCountOf(var4) >= var5) {return;}}this.addWorker((Runnable)null, false);}}private Runnable getTask() {boolean var1 = false;while(true) {int var2 = this.ctl.get();int var3 = runStateOf(var2);if (var3 >= 0 && (var3 >= 536870912 || this.workQueue.isEmpty())) {this.decrementWorkerCount();return null;}int var4 = workerCountOf(var2);boolean var5 = this.allowCoreThreadTimeOut || var4 > this.corePoolSize;if (var4 <= this.maximumPoolSize && (!var5 || !var1) || var4 <= 1 && !this.workQueue.isEmpty()) {try {Runnable var6 = var5 ? (Runnable)this.workQueue.poll(this.keepAliveTime, TimeUnit.NANOSECONDS) : (Runnable)this.workQueue.take();if (var6 != null) {return var6;}var1 = true;} catch (InterruptedException var7) {var1 = false;}} else if (this.compareAndDecrementWorkerCount(var2)) {return null;}}}final void runWorker(ThreadPoolExecutor.Worker var1) {Thread var2 = Thread.currentThread();Runnable var3 = var1.firstTask;var1.firstTask = null;var1.unlock();boolean var4 = true;try {while(var3 != null || (var3 = this.getTask()) != null) {var1.lock();if ((runStateAtLeast(this.ctl.get(), 536870912) || Thread.interrupted() && runStateAtLeast(this.ctl.get(), 536870912)) && !var2.isInterrupted()) {var2.interrupt();}try {this.beforeExecute(var2, var3);Object var5 = null;try {var3.run();} catch (RuntimeException var28) {var5 = var28;throw var28;} catch (Error var29) {var5 = var29;throw var29;} catch (Throwable var30) {var5 = var30;throw new Error(var30);} finally {this.afterExecute(var3, (Throwable)var5);}} finally {var3 = null;++var1.completedTasks;var1.unlock();}}var4 = false;} finally {this.processWorkerExit(var1, var4);}}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6) {this(var1, var2, var3, var5, var6, Executors.defaultThreadFactory(), defaultHandler);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, ThreadFactory var7) {this(var1, var2, var3, var5, var6, var7, defaultHandler);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, RejectedExecutionHandler var7) {this(var1, var2, var3, var5, var6, Executors.defaultThreadFactory(), var7);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, ThreadFactory var7, RejectedExecutionHandler var8) {this.ctl = new AtomicInteger(ctlOf(-536870912, 0));this.mainLock = new ReentrantLock();this.workers = new HashSet();this.termination = this.mainLock.newCondition();if (var1 >= 0 && var2 > 0 && var2 >= var1 && var3 >= 0L) {if (var6 != null && var7 != null && var8 != null) {this.corePoolSize = var1;this.maximumPoolSize = var2;this.workQueue = var6;this.keepAliveTime = var5.toNanos(var3);this.threadFactory = var7;this.handler = var8;} else {throw new NullPointerException();}} else {throw new IllegalArgumentException();}}public void execute(Runnable var1) {if (var1 == null) {throw new NullPointerException();} else {int var2 = this.ctl.get();if (workerCountOf(var2) < this.corePoolSize) {if (this.addWorker(var1, true)) {return;}var2 = this.ctl.get();}if (isRunning(var2) && this.workQueue.offer(var1)) {int var3 = this.ctl.get();if (!isRunning(var3) && this.remove(var1)) {this.reject(var1);} else if (workerCountOf(var3) == 0) {this.addWorker((Runnable)null, false);}} else if (!this.addWorker(var1, false)) {this.reject(var1);}}}public void shutdown() {ReentrantLock var1 = this.mainLock;var1.lock();try {this.checkShutdownAccess();this.advanceRunState(0);this.interruptIdleWorkers();this.onShutdown();} finally {var1.unlock();}this.tryTerminate();}public List<Runnable> shutdownNow() {ReentrantLock var2 = this.mainLock;var2.lock();List var1;try {this.checkShutdownAccess();this.advanceRunState(536870912);this.interruptWorkers();var1 = this.drainQueue();} finally {var2.unlock();}this.tryTerminate();return var1;}public boolean isShutdown() {return !isRunning(this.ctl.get());}public boolean isTerminating() {int var1 = this.ctl.get();return !isRunning(var1) && runStateLessThan(var1, 1610612736);}public boolean isTerminated() {return runStateAtLeast(this.ctl.get(), 1610612736);}public boolean awaitTermination(long var1, TimeUnit var3) throws InterruptedException {long var4 = var3.toNanos(var1);ReentrantLock var6 = this.mainLock;var6.lock();boolean var7;try {while(!runStateAtLeast(this.ctl.get(), 1610612736)) {if (var4 <= 0L) {var7 = false;return var7;}var4 = this.termination.awaitNanos(var4);}var7 = true;} finally {var6.unlock();}return var7;}protected void finalize() {this.shutdown();}public void setThreadFactory(ThreadFactory var1) {if (var1 == null) {throw new NullPointerException();} else {this.threadFactory = var1;}}public ThreadFactory getThreadFactory() {return this.threadFactory;}public void setRejectedExecutionHandler(RejectedExecutionHandler var1) {if (var1 == null) {throw new NullPointerException();} else {this.handler = var1;}}public RejectedExecutionHandler getRejectedExecutionHandler() {return this.handler;}public void setCorePoolSize(int var1) {if (var1 < 0) {throw new IllegalArgumentException();} else {int var2 = var1 - this.corePoolSize;this.corePoolSize = var1;if (workerCountOf(this.ctl.get()) > var1) {this.interruptIdleWorkers();} else if (var2 > 0) {int var3 = Math.min(var2, this.workQueue.size());while(var3-- > 0 && this.addWorker((Runnable)null, true) && !this.workQueue.isEmpty()) {;}}}}public int getCorePoolSize() {return this.corePoolSize;}public boolean prestartCoreThread() {return workerCountOf(this.ctl.get()) < this.corePoolSize && this.addWorker((Runnable)null, true);}void ensurePrestart() {int var1 = workerCountOf(this.ctl.get());if (var1 < this.corePoolSize) {this.addWorker((Runnable)null, true);} else if (var1 == 0) {this.addWorker((Runnable)null, false);}}public int prestartAllCoreThreads() {int var1;for(var1 = 0; this.addWorker((Runnable)null, true); ++var1) {;}return var1;}public boolean allowsCoreThreadTimeOut() {return this.allowCoreThreadTimeOut;}public void allowCoreThreadTimeOut(boolean var1) {if (var1 && this.keepAliveTime <= 0L) {throw new IllegalArgumentException("Core threads must have nonzero keep alive times");} else {if (var1 != this.allowCoreThreadTimeOut) {this.allowCoreThreadTimeOut = var1;if (var1) {this.interruptIdleWorkers();}}}}public void setMaximumPoolSize(int var1) {if (var1 > 0 && var1 >= this.corePoolSize) {this.maximumPoolSize = var1;if (workerCountOf(this.ctl.get()) > var1) {this.interruptIdleWorkers();}} else {throw new IllegalArgumentException();}}public int getMaximumPoolSize() {return this.maximumPoolSize;}public void setKeepAliveTime(long var1, TimeUnit var3) {if (var1 < 0L) {throw new IllegalArgumentException();} else if (var1 == 0L && this.allowsCoreThreadTimeOut()) {throw new IllegalArgumentException("Core threads must have nonzero keep alive times");} else {long var4 = var3.toNanos(var1);long var6 = var4 - this.keepAliveTime;this.keepAliveTime = var4;if (var6 < 0L) {this.interruptIdleWorkers();}}}public long getKeepAliveTime(TimeUnit var1) {return var1.convert(this.keepAliveTime, TimeUnit.NANOSECONDS);}public BlockingQueue<Runnable> getQueue() {return this.workQueue;}public boolean remove(Runnable var1) {boolean var2 = this.workQueue.remove(var1);this.tryTerminate();return var2;}public void purge() {BlockingQueue var1 = this.workQueue;try {Iterator var2 = var1.iterator();while(var2.hasNext()) {Runnable var8 = (Runnable)var2.next();if (var8 instanceof Future && ((Future)var8).isCancelled()) {var2.remove();}}} catch (ConcurrentModificationException var7) {Object[] var3 = var1.toArray();int var4 = var3.length;for(int var5 = 0; var5 < var4; ++var5) {Object var6 = var3[var5];if (var6 instanceof Future && ((Future)var6).isCancelled()) {var1.remove(var6);}}}this.tryTerminate();}public int getPoolSize() {ReentrantLock var1 = this.mainLock;var1.lock();int var2;try {var2 = runStateAtLeast(this.ctl.get(), 1073741824) ? 0 : this.workers.size();} finally {var1.unlock();}return var2;}public int getActiveCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {int var2 = 0;Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();if (var4.isLocked()) {++var2;}}int var8 = var2;return var8;} finally {var1.unlock();}}public int getLargestPoolSize() {ReentrantLock var1 = this.mainLock;var1.lock();int var2;try {var2 = this.largestPoolSize;} finally {var1.unlock();}return var2;}public long getTaskCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {long var2 = this.completedTaskCount;Iterator var4 = this.workers.iterator();while(var4.hasNext()) {ThreadPoolExecutor.Worker var5 = (ThreadPoolExecutor.Worker)var4.next();var2 += var5.completedTasks;if (var5.isLocked()) {++var2;}}long var9 = var2 + (long)this.workQueue.size();return var9;} finally {var1.unlock();}}public long getCompletedTaskCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {long var2 = this.completedTaskCount;ThreadPoolExecutor.Worker var5;for(Iterator var4 = this.workers.iterator(); var4.hasNext(); var2 += var5.completedTasks) {var5 = (ThreadPoolExecutor.Worker)var4.next();}long var9 = var2;return var9;} finally {var1.unlock();}}public String toString() {ReentrantLock var5 = this.mainLock;var5.lock();long var1;int var3;int var4;try {var1 = this.completedTaskCount;var4 = 0;var3 = this.workers.size();Iterator var6 = this.workers.iterator();while(var6.hasNext()) {ThreadPoolExecutor.Worker var7 = (ThreadPoolExecutor.Worker)var6.next();var1 += var7.completedTasks;if (var7.isLocked()) {++var4;}}} finally {var5.unlock();}int var11 = this.ctl.get();String var12 = runStateLessThan(var11, 0) ? "Running" : (runStateAtLeast(var11, 1610612736) ? "Terminated" : "Shutting down");return super.toString() + "[" + var12 + ", pool size = " + var3 + ", active threads = " + var4 + ", queued tasks = " + this.workQueue.size() + ", completed tasks = " + var1 + "]";}protected void beforeExecute(Thread var1, Runnable var2) {}protected void afterExecute(Runnable var1, Throwable var2) {}protected void terminated() {}public static class AbortPolicy implements RejectedExecutionHandler {public AbortPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {throw new RejectedExecutionException("Task " + var1.toString() + " rejected from " + var2.toString());}}public static class CallerRunsPolicy implements RejectedExecutionHandler {public CallerRunsPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {if (!var2.isShutdown()) {var1.run();}}}public static class DiscardOldestPolicy implements RejectedExecutionHandler {public DiscardOldestPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {if (!var2.isShutdown()) {var2.getQueue().poll();var2.execute(var1);}}}public static class DiscardPolicy implements RejectedExecutionHandler {public DiscardPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {}}private final class Worker extends AbstractQueuedSynchronizer implements Runnable {private static final long serialVersionUID = 6138294804551838833L;final Thread thread;Runnable firstTask;volatile long completedTasks;Worker(Runnable var2) {this.setState(-1);this.firstTask = var2;this.thread = ThreadPoolExecutor.this.getThreadFactory().newThread(this);}public void run() {ThreadPoolExecutor.this.runWorker(this);}protected boolean isHeldExclusively() {return this.getState() != 0;}protected boolean tryAcquire(int var1) {if (this.compareAndSetState(0, 1)) {this.setExclusiveOwnerThread(Thread.currentThread());return true;} else {return false;}}protected boolean tryRelease(int var1) {this.setExclusiveOwnerThread((Thread)null);this.setState(0);return true;}public void lock() {this.acquire(1);}public boolean tryLock() {return this.tryAcquire(1);}public void unlock() {this.release(1);}public boolean isLocked() {return this.isHeldExclusively();}void interruptIfStarted() {if (this.getState() >= 0) {Thread var1 = this.thread;if (this.thread != null && !var1.isInterrupted()) {try {var1.interrupt();} catch (SecurityException var3) {;}}}}}
}

newFixedThreadPool -> ThreadPoolExecutor
newSingleThreadExecutor -> FinalizableDelegatedExecutorService
newCachedThreadPool -> ThreadPoolExecutor
newSingleThreadScheduledExecutor -> DelegatedScheduledExecutorService
newScheduledThreadPool -> ScheduledThreadPoolExecutor
newWorkStealingPool -> ForkJoinPool

ThreadPoolExecutor 是创建创建线程池公共类也是核心类，不同的线程池其实就是参数传值不同。

ThreadPoolExecutor -> AbstractExecutorService -> ExecutorService -> Executor

ThreadPoolExecutor源码：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package java.util.concurrent;import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;public class ThreadPoolExecutor extends AbstractExecutorService {private final AtomicInteger ctl;private static final int COUNT_BITS = 29;private static final int CAPACITY = 536870911;private static final int RUNNING = -536870912;private static final int SHUTDOWN = 0;private static final int STOP = 536870912;private static final int TIDYING = 1073741824;private static final int TERMINATED = 1610612736;private final BlockingQueue<Runnable> workQueue;private final ReentrantLock mainLock;private final HashSet<ThreadPoolExecutor.Worker> workers;private final Condition termination;private int largestPoolSize;private long completedTaskCount;private volatile ThreadFactory threadFactory;private volatile RejectedExecutionHandler handler;private volatile long keepAliveTime;private volatile boolean allowCoreThreadTimeOut;private volatile int corePoolSize;private volatile int maximumPoolSize;private static final RejectedExecutionHandler defaultHandler = new ThreadPoolExecutor.AbortPolicy();private static final RuntimePermission shutdownPerm = new RuntimePermission("modifyThread");private static final boolean ONLY_ONE = true;private static int runStateOf(int var0) {return var0 & -536870912;}private static int workerCountOf(int var0) {return var0 & 536870911;}private static int ctlOf(int var0, int var1) {return var0 | var1;}private static boolean runStateLessThan(int var0, int var1) {return var0 < var1;}private static boolean runStateAtLeast(int var0, int var1) {return var0 >= var1;}private static boolean isRunning(int var0) {return var0 < 0;}private boolean compareAndIncrementWorkerCount(int var1) {return this.ctl.compareAndSet(var1, var1 + 1);}private boolean compareAndDecrementWorkerCount(int var1) {return this.ctl.compareAndSet(var1, var1 - 1);}private void decrementWorkerCount() {while(!this.compareAndDecrementWorkerCount(this.ctl.get())) {;}}private void advanceRunState(int var1) {int var2;do {var2 = this.ctl.get();} while(!runStateAtLeast(var2, var1) && !this.ctl.compareAndSet(var2, ctlOf(var1, workerCountOf(var2))));}final void tryTerminate() {while(true) {int var1 = this.ctl.get();if (isRunning(var1) || runStateAtLeast(var1, 1073741824) || runStateOf(var1) == 0 && !this.workQueue.isEmpty()) {return;}if (workerCountOf(var1) != 0) {this.interruptIdleWorkers(true);return;}ReentrantLock var2 = this.mainLock;var2.lock();try {if (!this.ctl.compareAndSet(var1, ctlOf(1073741824, 0))) {continue;}try {this.terminated();} finally {this.ctl.set(ctlOf(1610612736, 0));this.termination.signalAll();}} finally {var2.unlock();}return;}}private void checkShutdownAccess() {SecurityManager var1 = System.getSecurityManager();if (var1 != null) {var1.checkPermission(shutdownPerm);ReentrantLock var2 = this.mainLock;var2.lock();try {Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();var1.checkAccess(var4.thread);}} finally {var2.unlock();}}}private void interruptWorkers() {ReentrantLock var1 = this.mainLock;var1.lock();try {Iterator var2 = this.workers.iterator();while(var2.hasNext()) {ThreadPoolExecutor.Worker var3 = (ThreadPoolExecutor.Worker)var2.next();var3.interruptIfStarted();}} finally {var1.unlock();}}private void interruptIdleWorkers(boolean var1) {ReentrantLock var2 = this.mainLock;var2.lock();try {Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();Thread var5 = var4.thread;if (!var5.isInterrupted() && var4.tryLock()) {try {var5.interrupt();} catch (SecurityException var15) {;} finally {var4.unlock();}}if (var1) {break;}}} finally {var2.unlock();}}private void interruptIdleWorkers() {this.interruptIdleWorkers(false);}final void reject(Runnable var1) {this.handler.rejectedExecution(var1, this);}void onShutdown() {}final boolean isRunningOrShutdown(boolean var1) {int var2 = runStateOf(this.ctl.get());return var2 == -536870912 || var2 == 0 && var1;}private List<Runnable> drainQueue() {BlockingQueue var1 = this.workQueue;ArrayList var2 = new ArrayList();var1.drainTo(var2);if (!var1.isEmpty()) {Runnable[] var3 = (Runnable[])var1.toArray(new Runnable[0]);int var4 = var3.length;for(int var5 = 0; var5 < var4; ++var5) {Runnable var6 = var3[var5];if (var1.remove(var6)) {var2.add(var6);}}}return var2;}private boolean addWorker(Runnable var1, boolean var2) {while(true) {int var3 = this.ctl.get();int var4 = runStateOf(var3);if (var4 >= 0 && (var4 != 0 || var1 != null || this.workQueue.isEmpty())) {return false;}while(true) {int var5 = workerCountOf(var3);if (var5 >= 536870911 || var5 >= (var2 ? this.corePoolSize : this.maximumPoolSize)) {return false;}if (this.compareAndIncrementWorkerCount(var3)) {boolean var18 = false;boolean var19 = false;ThreadPoolExecutor.Worker var20 = null;try {var20 = new ThreadPoolExecutor.Worker(var1);Thread var6 = var20.thread;if (var6 != null) {ReentrantLock var7 = this.mainLock;var7.lock();try {int var8 = runStateOf(this.ctl.get());if (var8 < 0 || var8 == 0 && var1 == null) {if (var6.isAlive()) {throw new IllegalThreadStateException();}this.workers.add(var20);int var9 = this.workers.size();if (var9 > this.largestPoolSize) {this.largestPoolSize = var9;}var19 = true;}} finally {var7.unlock();}if (var19) {var6.start();var18 = true;}}} finally {if (!var18) {this.addWorkerFailed(var20);}}return var18;}var3 = this.ctl.get();if (runStateOf(var3) != var4) {break;}}}}private void addWorkerFailed(ThreadPoolExecutor.Worker var1) {ReentrantLock var2 = this.mainLock;var2.lock();try {if (var1 != null) {this.workers.remove(var1);}this.decrementWorkerCount();this.tryTerminate();} finally {var2.unlock();}}private void processWorkerExit(ThreadPoolExecutor.Worker var1, boolean var2) {if (var2) {this.decrementWorkerCount();}ReentrantLock var3 = this.mainLock;var3.lock();try {this.completedTaskCount += var1.completedTasks;this.workers.remove(var1);} finally {var3.unlock();}this.tryTerminate();int var4 = this.ctl.get();if (runStateLessThan(var4, 536870912)) {if (!var2) {int var5 = this.allowCoreThreadTimeOut ? 0 : this.corePoolSize;if (var5 == 0 && !this.workQueue.isEmpty()) {var5 = 1;}if (workerCountOf(var4) >= var5) {return;}}this.addWorker((Runnable)null, false);}}private Runnable getTask() {boolean var1 = false;while(true) {int var2 = this.ctl.get();int var3 = runStateOf(var2);if (var3 >= 0 && (var3 >= 536870912 || this.workQueue.isEmpty())) {this.decrementWorkerCount();return null;}int var4 = workerCountOf(var2);boolean var5 = this.allowCoreThreadTimeOut || var4 > this.corePoolSize;if (var4 <= this.maximumPoolSize && (!var5 || !var1) || var4 <= 1 && !this.workQueue.isEmpty()) {try {Runnable var6 = var5 ? (Runnable)this.workQueue.poll(this.keepAliveTime, TimeUnit.NANOSECONDS) : (Runnable)this.workQueue.take();if (var6 != null) {return var6;}var1 = true;} catch (InterruptedException var7) {var1 = false;}} else if (this.compareAndDecrementWorkerCount(var2)) {return null;}}}final void runWorker(ThreadPoolExecutor.Worker var1) {Thread var2 = Thread.currentThread();Runnable var3 = var1.firstTask;var1.firstTask = null;var1.unlock();boolean var4 = true;try {while(var3 != null || (var3 = this.getTask()) != null) {var1.lock();if ((runStateAtLeast(this.ctl.get(), 536870912) || Thread.interrupted() && runStateAtLeast(this.ctl.get(), 536870912)) && !var2.isInterrupted()) {var2.interrupt();}try {this.beforeExecute(var2, var3);Object var5 = null;try {var3.run();} catch (RuntimeException var28) {var5 = var28;throw var28;} catch (Error var29) {var5 = var29;throw var29;} catch (Throwable var30) {var5 = var30;throw new Error(var30);} finally {this.afterExecute(var3, (Throwable)var5);}} finally {var3 = null;++var1.completedTasks;var1.unlock();}}var4 = false;} finally {this.processWorkerExit(var1, var4);}}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6) {this(var1, var2, var3, var5, var6, Executors.defaultThreadFactory(), defaultHandler);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, ThreadFactory var7) {this(var1, var2, var3, var5, var6, var7, defaultHandler);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, RejectedExecutionHandler var7) {this(var1, var2, var3, var5, var6, Executors.defaultThreadFactory(), var7);}public ThreadPoolExecutor(int var1, int var2, long var3, TimeUnit var5, BlockingQueue<Runnable> var6, ThreadFactory var7, RejectedExecutionHandler var8) {this.ctl = new AtomicInteger(ctlOf(-536870912, 0));this.mainLock = new ReentrantLock();this.workers = new HashSet();this.termination = this.mainLock.newCondition();if (var1 >= 0 && var2 > 0 && var2 >= var1 && var3 >= 0L) {if (var6 != null && var7 != null && var8 != null) {this.corePoolSize = var1;this.maximumPoolSize = var2;this.workQueue = var6;this.keepAliveTime = var5.toNanos(var3);this.threadFactory = var7;this.handler = var8;} else {throw new NullPointerException();}} else {throw new IllegalArgumentException();}}public void execute(Runnable var1) {if (var1 == null) {throw new NullPointerException();} else {int var2 = this.ctl.get();if (workerCountOf(var2) < this.corePoolSize) {if (this.addWorker(var1, true)) {return;}var2 = this.ctl.get();}if (isRunning(var2) && this.workQueue.offer(var1)) {int var3 = this.ctl.get();if (!isRunning(var3) && this.remove(var1)) {this.reject(var1);} else if (workerCountOf(var3) == 0) {this.addWorker((Runnable)null, false);}} else if (!this.addWorker(var1, false)) {this.reject(var1);}}}public void shutdown() {ReentrantLock var1 = this.mainLock;var1.lock();try {this.checkShutdownAccess();this.advanceRunState(0);this.interruptIdleWorkers();this.onShutdown();} finally {var1.unlock();}this.tryTerminate();}public List<Runnable> shutdownNow() {ReentrantLock var2 = this.mainLock;var2.lock();List var1;try {this.checkShutdownAccess();this.advanceRunState(536870912);this.interruptWorkers();var1 = this.drainQueue();} finally {var2.unlock();}this.tryTerminate();return var1;}public boolean isShutdown() {return !isRunning(this.ctl.get());}public boolean isTerminating() {int var1 = this.ctl.get();return !isRunning(var1) && runStateLessThan(var1, 1610612736);}public boolean isTerminated() {return runStateAtLeast(this.ctl.get(), 1610612736);}public boolean awaitTermination(long var1, TimeUnit var3) throws InterruptedException {long var4 = var3.toNanos(var1);ReentrantLock var6 = this.mainLock;var6.lock();boolean var7;try {while(!runStateAtLeast(this.ctl.get(), 1610612736)) {if (var4 <= 0L) {var7 = false;return var7;}var4 = this.termination.awaitNanos(var4);}var7 = true;} finally {var6.unlock();}return var7;}protected void finalize() {this.shutdown();}public void setThreadFactory(ThreadFactory var1) {if (var1 == null) {throw new NullPointerException();} else {this.threadFactory = var1;}}public ThreadFactory getThreadFactory() {return this.threadFactory;}public void setRejectedExecutionHandler(RejectedExecutionHandler var1) {if (var1 == null) {throw new NullPointerException();} else {this.handler = var1;}}public RejectedExecutionHandler getRejectedExecutionHandler() {return this.handler;}public void setCorePoolSize(int var1) {if (var1 < 0) {throw new IllegalArgumentException();} else {int var2 = var1 - this.corePoolSize;this.corePoolSize = var1;if (workerCountOf(this.ctl.get()) > var1) {this.interruptIdleWorkers();} else if (var2 > 0) {int var3 = Math.min(var2, this.workQueue.size());while(var3-- > 0 && this.addWorker((Runnable)null, true) && !this.workQueue.isEmpty()) {;}}}}public int getCorePoolSize() {return this.corePoolSize;}public boolean prestartCoreThread() {return workerCountOf(this.ctl.get()) < this.corePoolSize && this.addWorker((Runnable)null, true);}void ensurePrestart() {int var1 = workerCountOf(this.ctl.get());if (var1 < this.corePoolSize) {this.addWorker((Runnable)null, true);} else if (var1 == 0) {this.addWorker((Runnable)null, false);}}public int prestartAllCoreThreads() {int var1;for(var1 = 0; this.addWorker((Runnable)null, true); ++var1) {;}return var1;}public boolean allowsCoreThreadTimeOut() {return this.allowCoreThreadTimeOut;}public void allowCoreThreadTimeOut(boolean var1) {if (var1 && this.keepAliveTime <= 0L) {throw new IllegalArgumentException("Core threads must have nonzero keep alive times");} else {if (var1 != this.allowCoreThreadTimeOut) {this.allowCoreThreadTimeOut = var1;if (var1) {this.interruptIdleWorkers();}}}}public void setMaximumPoolSize(int var1) {if (var1 > 0 && var1 >= this.corePoolSize) {this.maximumPoolSize = var1;if (workerCountOf(this.ctl.get()) > var1) {this.interruptIdleWorkers();}} else {throw new IllegalArgumentException();}}public int getMaximumPoolSize() {return this.maximumPoolSize;}public void setKeepAliveTime(long var1, TimeUnit var3) {if (var1 < 0L) {throw new IllegalArgumentException();} else if (var1 == 0L && this.allowsCoreThreadTimeOut()) {throw new IllegalArgumentException("Core threads must have nonzero keep alive times");} else {long var4 = var3.toNanos(var1);long var6 = var4 - this.keepAliveTime;this.keepAliveTime = var4;if (var6 < 0L) {this.interruptIdleWorkers();}}}public long getKeepAliveTime(TimeUnit var1) {return var1.convert(this.keepAliveTime, TimeUnit.NANOSECONDS);}public BlockingQueue<Runnable> getQueue() {return this.workQueue;}public boolean remove(Runnable var1) {boolean var2 = this.workQueue.remove(var1);this.tryTerminate();return var2;}public void purge() {BlockingQueue var1 = this.workQueue;try {Iterator var2 = var1.iterator();while(var2.hasNext()) {Runnable var8 = (Runnable)var2.next();if (var8 instanceof Future && ((Future)var8).isCancelled()) {var2.remove();}}} catch (ConcurrentModificationException var7) {Object[] var3 = var1.toArray();int var4 = var3.length;for(int var5 = 0; var5 < var4; ++var5) {Object var6 = var3[var5];if (var6 instanceof Future && ((Future)var6).isCancelled()) {var1.remove(var6);}}}this.tryTerminate();}public int getPoolSize() {ReentrantLock var1 = this.mainLock;var1.lock();int var2;try {var2 = runStateAtLeast(this.ctl.get(), 1073741824) ? 0 : this.workers.size();} finally {var1.unlock();}return var2;}public int getActiveCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {int var2 = 0;Iterator var3 = this.workers.iterator();while(var3.hasNext()) {ThreadPoolExecutor.Worker var4 = (ThreadPoolExecutor.Worker)var3.next();if (var4.isLocked()) {++var2;}}int var8 = var2;return var8;} finally {var1.unlock();}}public int getLargestPoolSize() {ReentrantLock var1 = this.mainLock;var1.lock();int var2;try {var2 = this.largestPoolSize;} finally {var1.unlock();}return var2;}public long getTaskCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {long var2 = this.completedTaskCount;Iterator var4 = this.workers.iterator();while(var4.hasNext()) {ThreadPoolExecutor.Worker var5 = (ThreadPoolExecutor.Worker)var4.next();var2 += var5.completedTasks;if (var5.isLocked()) {++var2;}}long var9 = var2 + (long)this.workQueue.size();return var9;} finally {var1.unlock();}}public long getCompletedTaskCount() {ReentrantLock var1 = this.mainLock;var1.lock();try {long var2 = this.completedTaskCount;ThreadPoolExecutor.Worker var5;for(Iterator var4 = this.workers.iterator(); var4.hasNext(); var2 += var5.completedTasks) {var5 = (ThreadPoolExecutor.Worker)var4.next();}long var9 = var2;return var9;} finally {var1.unlock();}}public String toString() {ReentrantLock var5 = this.mainLock;var5.lock();long var1;int var3;int var4;try {var1 = this.completedTaskCount;var4 = 0;var3 = this.workers.size();Iterator var6 = this.workers.iterator();while(var6.hasNext()) {ThreadPoolExecutor.Worker var7 = (ThreadPoolExecutor.Worker)var6.next();var1 += var7.completedTasks;if (var7.isLocked()) {++var4;}}} finally {var5.unlock();}int var11 = this.ctl.get();String var12 = runStateLessThan(var11, 0) ? "Running" : (runStateAtLeast(var11, 1610612736) ? "Terminated" : "Shutting down");return super.toString() + "[" + var12 + ", pool size = " + var3 + ", active threads = " + var4 + ", queued tasks = " + this.workQueue.size() + ", completed tasks = " + var1 + "]";}protected void beforeExecute(Thread var1, Runnable var2) {}protected void afterExecute(Runnable var1, Throwable var2) {}protected void terminated() {}public static class AbortPolicy implements RejectedExecutionHandler {public AbortPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {throw new RejectedExecutionException("Task " + var1.toString() + " rejected from " + var2.toString());}}public static class CallerRunsPolicy implements RejectedExecutionHandler {public CallerRunsPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {if (!var2.isShutdown()) {var1.run();}}}public static class DiscardOldestPolicy implements RejectedExecutionHandler {public DiscardOldestPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {if (!var2.isShutdown()) {var2.getQueue().poll();var2.execute(var1);}}}public static class DiscardPolicy implements RejectedExecutionHandler {public DiscardPolicy() {}public void rejectedExecution(Runnable var1, ThreadPoolExecutor var2) {}}private final class Worker extends AbstractQueuedSynchronizer implements Runnable {private static final long serialVersionUID = 6138294804551838833L;final Thread thread;Runnable firstTask;volatile long completedTasks;Worker(Runnable var2) {this.setState(-1);this.firstTask = var2;this.thread = ThreadPoolExecutor.this.getThreadFactory().newThread(this);}public void run() {ThreadPoolExecutor.this.runWorker(this);}protected boolean isHeldExclusively() {return this.getState() != 0;}protected boolean tryAcquire(int var1) {if (this.compareAndSetState(0, 1)) {this.setExclusiveOwnerThread(Thread.currentThread());return true;} else {return false;}}protected boolean tryRelease(int var1) {this.setExclusiveOwnerThread((Thread)null);this.setState(0);return true;}public void lock() {this.acquire(1);}public boolean tryLock() {return this.tryAcquire(1);}public void unlock() {this.release(1);}public boolean isLocked() {return this.isHeldExclusively();}void interruptIfStarted() {if (this.getState() >= 0) {Thread var1 = this.thread;if (this.thread != null && !var1.isInterrupted()) {try {var1.interrupt();} catch (SecurityException var3) {;}}}}}
}

关键参数，coreSize，maxSize, keepAliveTime, allowCoreThreadTimeOut等都是volatile, 池容器是hashset

AbstractExecutorService 源码：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package java.util.concurrent;import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;public abstract class AbstractExecutorService implements ExecutorService {public AbstractExecutorService() {}protected <T> RunnableFuture<T> newTaskFor(Runnable var1, T var2) {return new FutureTask(var1, var2);}protected <T> RunnableFuture<T> newTaskFor(Callable<T> var1) {return new FutureTask(var1);}public Future<?> submit(Runnable var1) {if (var1 == null) {throw new NullPointerException();} else {RunnableFuture var2 = this.newTaskFor(var1, (Object)null);this.execute(var2);return var2;}}public <T> Future<T> submit(Runnable var1, T var2) {if (var1 == null) {throw new NullPointerException();} else {RunnableFuture var3 = this.newTaskFor(var1, var2);this.execute(var3);return var3;}}public <T> Future<T> submit(Callable<T> var1) {if (var1 == null) {throw new NullPointerException();} else {RunnableFuture var2 = this.newTaskFor(var1);this.execute(var2);return var2;}}private <T> T doInvokeAny(Collection<? extends Callable<T>> var1, boolean var2, long var3) throws InterruptedException, ExecutionException, TimeoutException {if (var1 == null) {throw new NullPointerException();} else {int var5 = var1.size();if (var5 == 0) {throw new IllegalArgumentException();} else {ArrayList var6 = new ArrayList(var5);ExecutorCompletionService var7 = new ExecutorCompletionService(this);boolean var23 = false;Object var14;try {var23 = true;ExecutionException var8 = null;long var9 = var2 ? System.nanoTime() + var3 : 0L;Iterator var11 = var1.iterator();var6.add(var7.submit((Callable)var11.next()));--var5;int var12 = 1;while(true) {Future var13 = var7.poll();if (var13 == null) {if (var5 > 0) {--var5;var6.add(var7.submit((Callable)var11.next()));++var12;} else {if (var12 == 0) {if (var8 == null) {var8 = new ExecutionException();}throw var8;}if (var2) {var13 = var7.poll(var3, TimeUnit.NANOSECONDS);if (var13 == null) {throw new TimeoutException();}var3 = var9 - System.nanoTime();} else {var13 = var7.take();}}}if (var13 != null) {--var12;try {var14 = var13.get();var23 = false;break;} catch (ExecutionException var24) {var8 = var24;} catch (RuntimeException var25) {var8 = new ExecutionException(var25);}}}} finally {if (var23) {int var18 = 0;for(int var19 = var6.size(); var18 < var19; ++var18) {((Future)var6.get(var18)).cancel(true);}}}int var15 = 0;for(int var16 = var6.size(); var15 < var16; ++var15) {((Future)var6.get(var15)).cancel(true);}return var14;}}}public <T> T invokeAny(Collection<? extends Callable<T>> var1) throws InterruptedException, ExecutionException {try {return this.doInvokeAny(var1, false, 0L);} catch (TimeoutException var3) {assert false;return null;}}public <T> T invokeAny(Collection<? extends Callable<T>> var1, long var2, TimeUnit var4) throws InterruptedException, ExecutionException, TimeoutException {return this.doInvokeAny(var1, true, var4.toNanos(var2));}public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> var1) throws InterruptedException {if (var1 == null) {throw new NullPointerException();} else {ArrayList var2 = new ArrayList(var1.size());boolean var3 = false;boolean var14 = false;ArrayList var19;int var20;try {var14 = true;Iterator var4 = var1.iterator();while(true) {if (!var4.hasNext()) {int var18 = 0;for(var20 = var2.size(); var18 < var20; ++var18) {Future var21 = (Future)var2.get(var18);if (!var21.isDone()) {try {var21.get();} catch (CancellationException var15) {;} catch (ExecutionException var16) {;}}}var3 = true;var19 = var2;var14 = false;break;}Callable var5 = (Callable)var4.next();RunnableFuture var6 = this.newTaskFor(var5);var2.add(var6);this.execute(var6);}} finally {if (var14) {if (!var3) {int var9 = 0;for(int var10 = var2.size(); var9 < var10; ++var9) {((Future)var2.get(var9)).cancel(true);}}}}if (!var3) {var20 = 0;for(int var22 = var2.size(); var20 < var22; ++var20) {((Future)var2.get(var20)).cancel(true);}}return var19;}}public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> var1, long var2, TimeUnit var4) throws InterruptedException {if (var1 == null) {throw new NullPointerException();} else {long var5 = var4.toNanos(var2);ArrayList var7 = new ArrayList(var1.size());boolean var8 = false;boolean var25 = false;ArrayList var14;int var16;int var35;label274: {ArrayList var15;label275: {ArrayList var31;int var34;label276: {ArrayList var13;try {label286: {var25 = true;Iterator var9 = var1.iterator();while(var9.hasNext()) {Callable var10 = (Callable)var9.next();var7.add(this.newTaskFor(var10));}long var30 = System.nanoTime() + var5;int var11 = var7.size();int var12;for(var12 = 0; var12 < var11; ++var12) {this.execute((Runnable)var7.get(var12));var5 = var30 - System.nanoTime();if (var5 <= 0L) {var13 = var7;var25 = false;break label286;}}for(var12 = 0; var12 < var11; ++var12) {Future var32 = (Future)var7.get(var12);if (!var32.isDone()) {if (var5 <= 0L) {var14 = var7;var25 = false;break label274;}try {var32.get(var5, TimeUnit.NANOSECONDS);} catch (CancellationException var26) {;} catch (ExecutionException var27) {;} catch (TimeoutException var28) {var15 = var7;var25 = false;break label275;}var5 = var30 - System.nanoTime();}}var8 = true;var31 = var7;var25 = false;break label276;}} finally {if (var25) {if (!var8) {int var19 = 0;for(int var20 = var7.size(); var19 < var20; ++var19) {((Future)var7.get(var19)).cancel(true);}}}}if (!var8) {var34 = 0;for(var35 = var7.size(); var34 < var35; ++var34) {((Future)var7.get(var34)).cancel(true);}}return var13;}if (!var8) {int var33 = 0;for(var34 = var7.size(); var33 < var34; ++var33) {((Future)var7.get(var33)).cancel(true);}}return var31;}if (!var8) {var16 = 0;for(int var17 = var7.size(); var16 < var17; ++var16) {((Future)var7.get(var16)).cancel(true);}}return var15;}if (!var8) {var35 = 0;for(var16 = var7.size(); var35 < var16; ++var35) {((Future)var7.get(var35)).cancel(true);}}return var14;}}
}

ExecutorService 源码：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package java.util.concurrent;import java.util.Collection;
import java.util.List;public interface ExecutorService extends Executor {void shutdown();List<Runnable> shutdownNow();boolean isShutdown();boolean isTerminated();boolean awaitTermination(long var1, TimeUnit var3) throws InterruptedException;<T> Future<T> submit(Callable<T> var1);<T> Future<T> submit(Runnable var1, T var2);Future<?> submit(Runnable var1);<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> var1) throws InterruptedException;<T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> var1, long var2, TimeUnit var4) throws InterruptedException;<T> T invokeAny(Collection<? extends Callable<T>> var1) throws InterruptedException, ExecutionException;<T> T invokeAny(Collection<? extends Callable<T>> var1, long var2, TimeUnit var4) throws InterruptedException, ExecutionException, TimeoutException;
}

Executor 源码：

package java.util.concurrent;public interface Executor {void execute(Runnable var1);
}

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