Java 創(chuàng)建線程池的四種方式
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1、newCachedThreadPool 創(chuàng)建一個(gè)可緩存線程池,如果線程池長度超過處理需要,可靈活回收空閑線程,若無可回收,則新建線程。
2、newFixedThreadPool 創(chuàng)建一個(gè)定長線程池,可控制線程最大并發(fā)數(shù),超出的線程會(huì)在隊(duì)列中等待。
3、newScheduledThreadPool 創(chuàng)建一個(gè)定長線程池,支持定時(shí)及周期性任務(wù)執(zhí)行。
4、newSingleThreadExecutor 創(chuàng)建一個(gè)單線程化的線程池,它只會(huì)用唯一的工作線程來執(zhí)行任務(wù),保證所有任務(wù)按照指定順序(FIFO, LIFO, 優(yōu)先級(jí))執(zhí)行。
newCachedThreadPool
創(chuàng)建一個(gè)可緩存線程池,如果線程池長度超過處理需要,可靈活回收空閑線程,
若無可回收,則新建線程。
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() { @Override public 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<Runnable>()); }
newFixedThreadPool
創(chuàng)建一個(gè)定長線程池,可控制線程最大并發(fā)數(shù),超出的線程會(huì)在隊(duì)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() { @Override public 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<Runnable>()); }
newScheduledThreadPool
創(chuàng)建一個(gè)定長線程池,支持定時(shí)及周期性任務(wù)執(zhí)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() { @Override public 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
創(chuàng)建一個(gè)單線程化的線程池,它只會(huì)用唯一的工作線程來執(zhí)行任務(wù),
保證所有任務(wù)按照指定順序(FIFO, LIFO, 優(yōu)先級(jí))執(zhí)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() { @Override public void run() { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + " i=" + temp); } }); } } }
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