多线程编程

code/Java/java-concurrency/src/main/java/com/heibaiying/cyclicBarrier/J1_CyclicBarrier.java

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+package com.heibaiying.cyclicBarrier;
+
+import java.util.concurrent.BrokenBarrierException;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * 每五个人完成任务后,则算一个小组已完成
+ */
+public class J1_CyclicBarrier {
+
+	private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5, () -> System.out.println("五人小组任务执行完成"));
+
+	static class Task implements Runnable {
+		@Override
+		public void run() {
+			try {
+				long l = new Double(Math.random() * 5000).longValue();
+				Thread.sleep(l);
+				System.out.println("任务" + Thread.currentThread().getId() + "执行完成");
+				cyclicBarrier.await();
+			} catch (InterruptedException | BrokenBarrierException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	public static void main(String[] args) {
+		ExecutorService executorService = Executors.newFixedThreadPool(20);
+		for (int j = 0; j < 10; j++) {
+			executorService.submit(new Task());
+		}
+		executorService.shutdown();
+	}
+}