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Commit 87009c4

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线程池详解
1 parent 3bfa563 commit 87009c4

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15 files changed

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-164
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15 files changed

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‎code/java/ThreadPoolExecutorDemo/.idea/uiDesigner.xml‎

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package callable;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Future;
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import java.util.concurrent.ThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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import static common.ThreadPoolConstants.CORE_POOL_SIZE;
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import static common.ThreadPoolConstants.KEEP_ALIVE_TIME;
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import static common.ThreadPoolConstants.MAX_POOL_SIZE;
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import static common.ThreadPoolConstants.QUEUE_CAPACITY;
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public class CallableDemo {
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public static void main(String[] args) {
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//使用阿里巴巴推荐的创建线程池的方式
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//通过ThreadPoolExecutor构造函数自定义参数创建
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ThreadPoolExecutor executor = new ThreadPoolExecutor(
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CORE_POOL_SIZE,
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MAX_POOL_SIZE,
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KEEP_ALIVE_TIME,
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TimeUnit.SECONDS,
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new ArrayBlockingQueue<>(QUEUE_CAPACITY),
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new ThreadPoolExecutor.CallerRunsPolicy());
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List<Future<String>> futureList = new ArrayList<>();
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Callable<String> callable = new MyCallable();
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for (int i = 0; i < 10; i++) {
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//提交任务到线程池
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Future<String> future = executor.submit(callable);
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//将返回值 future 添加到 list,我们可以通过 future 获得 执行 Callable 得到的返回值
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futureList.add(future);
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}
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for (Future<String> fut : futureList) {
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try {
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System.out.println(new Date() + "::" + fut.get());
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} catch (InterruptedException | ExecutionException e) {
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e.printStackTrace();
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}
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}
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//关闭线程池
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executor.shutdown();
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}
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}
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package callable;
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import java.util.concurrent.Callable;
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public class MyCallable implements Callable<String> {
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@Override
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public String call() throws Exception {
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Thread.sleep(1000);
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//返回执行当前 Callable 的线程名字
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return Thread.currentThread().getName();
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}
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}

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