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Java Executors newSingleThreadExecutor()用法及代码示例


Executors 类的 newSingleThreadExecutor() 方法创建一个 Executor，该 Executor 使用单个工作线程在无界队列上运行。 (但请注意，如果该单个线程在关闭前的执行过程中因失败而终止，则在需要执行后续任务时将替换为一个新线程。)。

用法

public static ExecutorService newSingleThreadExecutor()
public static ExecutorService newSingleThreadExecutor(ThreadFactory threadFactory)

参数

threadFactory - 创建新线程时使用的工厂

返回

新创建的 single-threaded Executor

抛出

NullPointerException

例子1

//import statement
 
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ExecutorsnewSingleThreadExecutorExample1  {
    public static void main(String[] args) {
        System.out.println("current thread:" + Thread.currentThread().getName());

        System.out.println(" Executor Service...");
        ExecutorService ex  = Executors.newSingleThreadExecutor();

        System.out.println("Runnable...");
        Runnable runnable = () -> {
            System.out.println("::" + Thread.currentThread().getName());
        };

        System.out.println("Submit the task ");
        ex.submit(runnable);
    }
}

输出：

current thread:main
 Executor Service...
Runnable...
Submit the task 
::pool-1-thread-1

例子1

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class ExecutorsnewSingleThreadExecutorExample2   {

   public static void main(final String[] arguments) throws InterruptedException {
      ExecutorService ex = Executors.newSingleThreadExecutor();

      try {
         ex.submit(new myThread5());
         System.out.println("Shutingdown executor");
         ex.shutdown();
         ex.awaitTermination(10, TimeUnit.SECONDS);
      } catch (InterruptedException e) {
         System.err.println(e);
      } finally {

         if (!ex.isTerminated()) {
            System.err.println("cancel  tasks");
         }
         ex.shutdownNow();
         System.out.println(" finished");
      }
   }

   static class myThread5 implements Runnable {
      
      public void run() {

         try {
            Long duration = (long) (Math.random() * 90);
            System.out.println("Running Task!");
            TimeUnit.SECONDS.sleep(duration);
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

输出：

Shutingdown executor
Running Task!




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注：本文由纯净天空筛选整理自 Java Executors newSingleThreadExecutor() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。