可以通过调用Executors类的static newSingleThreadExecutor()方法获得单个线程池。
语法
ExecutorService executor = Executors.newSingleThreadExecutor()
newSingleThreadExecutor()方法创建一次执行单个任务的执行程序。
示例
以下TestThread程序显示了基于线程的环境中newSingleThreadExecutor()方法的使用。
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors
import java.util.concurrent.TimeUnit
public class TestThread {
public static void main(final String[] arguments) throws InterruptedException {
ExecutorService executor = Executors.newSingleThreadExecutor()
try {
executor.submit(new Task())
System.out.println("Shutdown executor")
executor.shutdown()
executor.awaitTermination(5, TimeUnit.SECONDS)
}
catch (InterruptedException e) {
System.err.println("tasks interrupted")
}
finally {
if (!executor.isTerminated()) {
System.err.println("cancel non-finished tasks")
}
executor.shutdownNow()
System.out.println("shutdown finished")
}
}
static class Task implements Runnable {
public void run() {
try {
Long duration = (long) (Math.random() * 20)
System.out.println("Running Task!")
TimeUnit.SECONDS.sleep(duration)
}
catch (InterruptedException e) {
e.printStackTrace()
}
}
}
}
这将产生以下结果 -
Shutdown executor
Running Task!
shutdown finished
cancel non-finished tasks
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at java.lang.Thread.sleep(Thread.java:302)
at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:328)
at TestThread$Task.run(TestThread.java:39)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)