1.執行緒池 isShutdown和isTerminated的區別

isShutDown當呼叫shutdown()方法後返回為true。
isTerminated當呼叫shutdown()方法後，並且所有提交的任務完成後返回為true

執行緒池任務正常完成，都為false

package com.cweeyii.threadpool;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * Created by wenyi on 16/10/16.
 * Email:[email protected]
 */
public class ShutDownWait {
    private static final Logger LOGGER = LoggerFactory.getLogger(ShutDownWait.class);

    public static void main(String[] args) throws InterruptedException {
        int workerNum = 2
 
;
        ExecutorService executorService = Executors.newFixedThreadPool(workerNum);
        for (int i = 0; i < workerNum; i++) {
            executorService.submit(new SleepWorker());
        }
        //executorService.shutdown();
        //LOGGER.info("shutdown=" + executorService.isShutdown() + " terminate=" + executorService.isTerminated());
 

        executorService.awaitTermination(10, TimeUnit.SECONDS);
        LOGGER.info("shutdown="+executorService.isShutdown()+" terminate="+executorService.isTerminated());
        LOGGER.info("呼叫shutdown會立即返回不會等待執行緒池任務執行完");
    }
}

12:56:58.849  INFO (SleepWorker.java:31) - threadName=pool-1-thread-1 執行緒結束null工作
12:56:58.849  INFO (SleepWorker.java:31) - threadName=pool-1-thread-2 執行緒結束null工作
12:57:06.843  INFO (ShutDownWait.java:26) - shutdown=false terminate=false
12:57:06.846  INFO (ShutDownWait.java:27) - 呼叫shutdown會立即返回不會等待執行緒池任務執行完

取消註釋後結果：
13:57:08.518  INFO (ShutDownWait.java:24) - shutdown=true terminate=false
13:57:10.523  INFO (SleepWorker.java:31) - threadName=pool-1-thread-1 執行緒結束null工作
13:57:10.523  INFO (SleepWorker.java:31) - threadName=pool-1-thread-2 執行緒結束null工作
13:57:10.526  INFO (ShutDownWait.java:26) - shutdown=true terminate=true
13:57:10.527  INFO (ShutDownWait.java:27) - 呼叫shutdown會立即返回不會等待執行緒池任務執行完