Java Executors newCachedThreadPool() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Executors 类的 newCachedThreadPool() 方法创建一个线程池，该线程池会根据需要创建新线程，但在可用时将重用先前构造的线程。

语法

public static ExecutorService newCachedThreadPool()
public static ExecutorService newCachedThreadPool (ThreadFactory threadFactory)

参数

threadFactory - 创建新线程时使用的工厂

返回值

新创建的线程池

抛出

NullPointerException

示例 1

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

public class ExecutornewCachedThreadPoolExample1  {
	
   public static void main(final String[] arguments) throws InterruptedException {
      ExecutorService excr = Executors.newCachedThreadPool();
      ThreadPoolExecutor mypool = (ThreadPoolExecutor) excr;
//print statement will print the pool size.
      System.out.println("size of mypool: " + mypool.getPoolSize());
      excr.submit(new Threadimpl());
      excr.submit(new Threadimpl());
      System.out.println("Total number threads scheduled): "+ mypool.getTaskCount());
      excr.shutdown();
   }  

   static class Threadimpl implements Runnable {

      public void run() {
         
         try {
            Long num = (long) (Math.random() / 30);
            System.out.println("Thread Name: " +Thread.currentThread().getName());
               TimeUnit.SECONDS.sleep(num);
            System.out.println("after sleep Thread Name: " +Thread.currentThread().getName());
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

输出

size of mypool: 0
Total number threads scheduled): 2
Thread Name: pool-1-thread-2
Thread Name: pool-1-thread-1
after sleep Thread Name: pool-1-thread-2
after sleep Thread Name: pool-1-thread-1

示例 2

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

public class ExecutornewCachedThreadPoolExample2  {
	
   public static void main(final String[] arguments) throws InterruptedException {
       ThreadFactory ThreadFactory = Executors.defaultThreadFactory();
      ExecutorService excr = Executors.newCachedThreadPool(ThreadFactory);
      ThreadPoolExecutor mypool = (ThreadPoolExecutor) excr;
      System.out.println("size of mypool: " + mypool.getPoolSize());
      for(int i=0 ; i<= 4 ; i++) {
      excr.submit(new Threadimpl());
      }
      excr.shutdown();
   }  

   static class Threadimpl implements Runnable {

      public void run() {
         
         try {
            Long num = (long) (Math.random() / 30);
            System.out.println("Thread Name: " +Thread.currentThread().getName());
               TimeUnit.SECONDS.sleep(num);
            System.out.println("after sleep Thread Name: " +Thread.currentThread().getName());
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

输出

Thread Name: pool-1-thread-4
after sleep Thread Name: pool-1-thread-4
Thread Name: pool-1-thread-3
after sleep Thread Name: pool-1-thread-3
Thread Name: pool-1-thread-1
after sleep Thread Name: pool-1-thread-1

下一主题Java Executors

Java Executors newCachedThreadPool() 方法

语法

参数

返回值

抛出

示例 1

示例 2

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Java Executors newCachedThreadPool() 方法

语法

参数

返回值

抛出

示例 1

示例 2

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