Java 创建线程池的四种方式

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Java 创建线程池的四种方式

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1、newCachedThreadPool 创建一个可缓存线程池，如果线程池长度超过处理需要，可灵活回收空闲线程，若无可回收，则新建线程。

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2、newFixedThreadPool 创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待。

3、newScheduledThreadPool 创建一个定长线程池，支持定时及周期性任务执行。

4、newSingleThreadExecutor 创建一个单线程化的线程池，它只会用唯一的工作线程来执行任务，保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行。

newCachedThreadPool

创建一个可缓存线程池，如果线程池长度超过处理需要，可灵活回收空闲线程，

若无可回收，则新建线程。

package cn.qbz.thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Test111907 { public static void main(String[] args) { ExecutorService executorService = Executors.newCachedThreadPool(); for (int i = 0; i < 10; i++) { final int temp = i; executorService.execute(new Runnable() {@Overridepublic void run() { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + " i=" + temp);} }); } }} public static ExecutorService newCachedThreadPool() { return new ThreadPoolExecutor(0, Integer.MAX_VALUE,60L, TimeUnit.SECONDS,new SynchronousQueue()); }

newFixedThreadPool

创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待。

package cn.qbz.thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Test111907 { public static void main(String[] args) { ExecutorService executorService = Executors.newFixedThreadPool(3); for (int i = 0; i < 10; i++) { final int temp = i; executorService.execute(new Runnable() {@Overridepublic void run() { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + " i=" + temp);} }); } }} public static ExecutorService newFixedThreadPool(int nThreads) { return new ThreadPoolExecutor(nThreads, nThreads,0L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue()); }

newScheduledThreadPool

创建一个定长线程池，支持定时及周期性任务执行。

package cn.qbz.thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class Test111907 { public static void main(String[] args) { final long begin = System.currentTimeMillis(); ExecutorService executorService = Executors.newScheduledThreadPool(3); for (int i = 0; i < 10; i++) { final int temp = i; final long time = begin; executorService.schedule(new Runnable() {@Overridepublic void run() { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + " i=" + temp + " time=" + (System.currentTimeMillis() - time));} }, 5, TimeUnit.SECONDS); } }} public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize) { return new ScheduledThreadPoolExecutor(corePoolSize); } public ScheduledThreadPoolExecutor(int corePoolSize) { super(corePoolSize, Integer.MAX_VALUE, 0, TimeUnit.NANOSECONDS, new DelayedWorkQueue()); }

newSingleThreadExecutor

创建一个单线程化的线程池，它只会用唯一的工作线程来执行任务，

保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行。

package cn.qbz.thread;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class Test111907 { public static void main(String[] args) { ExecutorService executorService = Executors.newSingleThreadExecutor(); for (int i = 0; i < 10; i++) { final int temp = i; executorService.execute(new Runnable() {@Overridepublic void run() { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + " i=" + temp);} }); } }}

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