1、SingleThreadExecutor就像线程数为1的FixedThreadPool。
2、如果向SingleThreadExecutor提交多个任务,这些任务将排队。从输出结果可以看到,任务按照提交顺序被执行。
3、SingleThreadExecutor会序列化所有提交的任务,并维护自己(隐藏)的悬挂任务队列。???(不懂)
4、SingleThreadExecutor可以确保任何线程中都只有唯一的任务在运行。(多个线程使用同一文件系统时,可以用SingleThreadExecutor来保持同步)
import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class SingleThreadExecutor { public static void main(String[] args) { ExecutorService executorService=Executors.newSingleThreadExecutor(); for(int i=0;i<5;i++){ executorService.execute(new LiftOff()); } executorService.shutdown(); } static public class LiftOff implements Runnable{ protected int countDown=10; private static int taskCount=0; private final int id=taskCount++; public LiftOff(){} public LiftOff(int countDown){ this.countDown=countDown; } public String status(){ return "#"+id+"("+(countDown>0?countDown:"Liftoff!")+"),"; } public void run(){ while(countDown-->0){ System.out.print(status()); Thread.yield(); } } } } //output //#0(9),#0(8),#0(7),#0(6),#0(5),#0(4),#0(3),#0(2),#0(1),#0(Liftoff!), //#1(9),#1(8),#1(7),#1(6),#1(5),#1(4),#1(3),#1(2),#1(1),#1(Liftoff!), //#2(9),#2(8),#2(7),#2(6),#2(5),#2(4),#2(3),#2(2),#2(1),#2(Liftoff!), //#3(9),#3(8),#3(7),#3(6),#3(5),#3(4),#3(3),#3(2),#3(1),#3(Liftoff!), //#4(9),#4(8),#4(7),#4(6),#4(5),#4(4),#4(3),#4(2),#4(1),#4(Liftoff!),
原文:http://blog.csdn.net/dutsoft/article/details/38947053