ArrayBlockingQueue and ExecutorService

ArrayBlockingQueue and ExecutorService

package test;import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.BlockingQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;public class Test {    public static void main(String[] args) {        //executorServiceTest()        arrayBlockingQueueTest();    }    public static void arrayBlockingQueueTest(){        BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(5);         ThreadPoolExecutor executor=new ThreadPoolExecutor(3, Runtime.getRuntime().availableProcessors(), 1,                TimeUnit.HOURS, queue,new ThreadPoolExecutor.CallerRunsPolicy());        for(int i=0;i<100;i++){            final int index=i;            System.out.println("task:"+(i+1));            Runnable run=new Runnable() {                @Override                public void run() {                    System.out.println("thread start" + index);                    try {                          Thread.sleep(1000*3);                    }catch(Exception e){                        e.printStackTrace();                    }                    System.out.println("thread end "+index);                }            };            executor.execute(run);        }    }    public static void executorServiceTest(){        ExecutorService service = Executors.newFixedThreadPool(2);        for(int i=0;i<100;i++){            final int index=i;            System.out.println("task:"+(i+1));            Runnable run=new Runnable() {                @Override                public void run() {                    System.out.println("thread start" + index);                    try {                          Thread.sleep(1000*3);                    }catch(Exception e){                        e.printStackTrace();                    }                    System.out.println("thread end "+index);                }            };            service.execute(run);        }    }}

Result of calling the executorServiceTest Method

task:1task:2task:3thread start0task:4task:5thread start1task:6task:7task:8task:9task:10thread end 0thread start2thread end 1thread start3thread end 2thread end 3thread start4thread start5thread end 5thread start6thread end 4thread start7thread end 6thread end 7thread start8thread start9thread end 8thread end 9

Call arrayBlockingQueueTest to run the result

task:1task:2task:3thread start0thread start1task:4thread start2task:5task:6task:7thread start6thread end 1thread end 6thread end 0thread end 2thread start5thread start4task:8task:9thread start3task:10thread end 5thread end 3thread end 4thread start9thread start8thread start7thread end 9thread end 8thread end 7

From the running results, it is not difficult to see that ExecutorService is used to call all threads and put them in the memory.
In ArrayBlockingQueue, there is a thread capacity, and there are four in the running results, which achieves the effect of automatic blocking of queues.