java Executor学习与理解

最新推荐文章于 2025-06-22 16:10:29 发布

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本文通过对比使用 Java Executor 服务和直接创建线程的方式执行大量任务，来评估 Java Executor 服务的性能表现。测试中设置了不同的线程池大小，并记录了任务全部完成所需的时间。

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java Executor

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package abc.repeat.test;

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

public class ExecutorTest {

    public static void main(String[] args) throws IOException, InterruptedException {
        boolean useExecutor = false;
        int waitMillis = 1000;
        int taskNo = 10000;

        long startTime = System.currentTimeMillis();

        if (useExecutor) {
            ExecutorService service = Executors.newFixedThreadPool(1);
            //ExecutorService service = Executors.newFixedThreadPool(10);
            //ExecutorService service = Executors.newFixedThreadPool(100);
            for (int i = 0; i < taskNo; i++) {
                Runnable run = new Runnable() {
                    @Override
                    public void run() {
                        System.out.println("thread start");
                    }
                };
                service.execute(run);
            }
            service.shutdown();
            service.awaitTermination(waitMillis, TimeUnit.MILLISECONDS);

        } else {
            for (int i = 0; i < taskNo; i++) {
                Runnable run = new Runnable() {
                    @Override
                    public void run() {
                        System.out.println("thread start");
                    }
                };
                Thread t = new Thread(run);
                t.start();
                t.join(waitMillis);
            }
        }

        System.out.println("all thread complete");
        long endTime = System.currentTimeMillis();
        System.out.println(String.format("TimeElapse: %s", endTime - startTime));
    }
}