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123 changes: 123 additions & 0 deletions
123
...t/src/main/java/io/github/dunwu/javacore/concurrent/container/ArrayBlockingQueueDemo.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package io.github.dunwu.javacore.concurrent.container; | ||
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| import java.util.concurrent.ArrayBlockingQueue; | ||
| import java.util.concurrent.BlockingQueue; | ||
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| /** | ||
| * BlockingQueue 示例 | ||
| * | ||
| * @author <a href="mailto:[email protected]">Zhang Peng</a> | ||
| * @date 2024-07-15 | ||
| */ | ||
| public class ArrayBlockingQueueDemo { | ||
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| public static final String EXIT_MSG = "Good bye!"; | ||
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| public static void main(String[] args) { | ||
| // 使用较小的队列，以更好地在输出中展示其影响 | ||
| BlockingQueue<String> queue = new ArrayBlockingQueue<>(3); | ||
| Producer producer = new Producer(queue); | ||
| Consumer consumer = new Consumer(queue); | ||
| new Thread(producer).start(); | ||
| new Thread(consumer).start(); | ||
| } | ||
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| static class Producer implements Runnable { | ||
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| private BlockingQueue<String> queue; | ||
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| public Producer(BlockingQueue<String> q) { | ||
| this.queue = q; | ||
| } | ||
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| @Override | ||
| public void run() { | ||
| for (int i = 0; i < 20; i++) { | ||
| try { | ||
| Thread.sleep(5L); | ||
| String msg = "Message" + i; | ||
| System.out.println("Produced new item: " + msg); | ||
| queue.put(msg); | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
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| try { | ||
| System.out.println("Time to say good bye!"); | ||
| queue.put(EXIT_MSG); | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
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| } | ||
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| static class Consumer implements Runnable { | ||
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| private BlockingQueue<String> queue; | ||
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| public Consumer(BlockingQueue<String> q) { | ||
| this.queue = q; | ||
| } | ||
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| @Override | ||
| public void run() { | ||
| try { | ||
| String msg; | ||
| while (!EXIT_MSG.equalsIgnoreCase((msg = queue.take()))) { | ||
| System.out.println("Consumed item: " + msg); | ||
| Thread.sleep(10L); | ||
| } | ||
| System.out.println("Got exit message, bye!"); | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
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| } | ||
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| } | ||
| // 输出示例： | ||
| // | ||
| // Produced new item: Message0 | ||
| // Consumed item: Message0 | ||
| // Produced new item: Message1 | ||
| // Consumed item: Message1 | ||
| // Produced new item: Message2 | ||
| // Produced new item: Message3 | ||
| // Consumed item: Message2 | ||
| // Produced new item: Message4 | ||
| // Produced new item: Message5 | ||
| // Consumed item: Message3 | ||
| // Produced new item: Message6 | ||
| // Produced new item: Message7 | ||
| // Consumed item: Message4 | ||
| // Produced new item: Message8 | ||
| // Consumed item: Message5 | ||
| // Produced new item: Message9 | ||
| // Consumed item: Message6 | ||
| // Produced new item: Message10 | ||
| // Consumed item: Message7 | ||
| // Produced new item: Message11 | ||
| // Consumed item: Message8 | ||
| // Produced new item: Message12 | ||
| // Consumed item: Message9 | ||
| // Produced new item: Message13 | ||
| // Consumed item: Message10 | ||
| // Produced new item: Message14 | ||
| // Consumed item: Message11 | ||
| // Produced new item: Message15 | ||
| // Consumed item: Message12 | ||
| // Produced new item: Message16 | ||
| // Consumed item: Message13 | ||
| // Produced new item: Message17 | ||
| // Consumed item: Message14 | ||
| // Produced new item: Message18 | ||
| // Consumed item: Message15 | ||
| // Produced new item: Message19 | ||
| // Consumed item: Message16 | ||
| // Time to say good bye! | ||
| // Consumed item: Message17 | ||
| // Consumed item: Message18 | ||
| // Consumed item: Message1 |
47 changes: 47 additions & 0 deletions
47
...t/src/main/java/io/github/dunwu/javacore/concurrent/forkjoin/CompletableFutureDemo02.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package io.github.dunwu.javacore.concurrent.forkjoin; | ||
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| import java.util.concurrent.CompletableFuture; | ||
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| /** | ||
| * @author <a href="mailto:[email protected]">Zhang Peng</a> | ||
| * @date 2024-02-21 | ||
| */ | ||
| public class CompletableFutureDemo02 { | ||
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| public static void main(String[] args) { | ||
| noException(); | ||
| catchException(); | ||
| catchException2(); | ||
| } | ||
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| public static void noException() { | ||
| try { | ||
| CompletableFuture.runAsync(() -> { | ||
| int num = 1 / 0; | ||
| }); | ||
| } catch (Exception e) { | ||
| System.err.println("noException: " + e.getMessage()); | ||
| } | ||
| } | ||
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| public static void catchException() { | ||
| try { | ||
| CompletableFuture.runAsync(() -> { | ||
| int num = 1 / 0; | ||
| }).get(); | ||
| } catch (Exception e) { | ||
| System.err.println("catchException: " + e.getMessage()); | ||
| } | ||
| } | ||
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| public static void catchException2() { | ||
| try { | ||
| CompletableFuture.runAsync(() -> { | ||
| int num = 1 / 0; | ||
| }).join(); | ||
| } catch (Exception e) { | ||
| System.err.println("catchException2: " + e.getMessage()); | ||
| } | ||
| } | ||
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| } |
30 changes: 30 additions & 0 deletions
30
...acore-concurrent/src/main/java/io/github/dunwu/javacore/concurrent/sync/VolatileDemo.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package io.github.dunwu.javacore.concurrent.sync; | ||
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| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
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| public class VolatileDemo { | ||
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| public volatile static int count = 0; | ||
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| public void add() { | ||
| count++; | ||
| } | ||
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| public static void main(String[] args) throws InterruptedException { | ||
| ExecutorService threadPool = Executors.newFixedThreadPool(5); | ||
| VolatileDemo volatileAtomicityDemo = new VolatileDemo(); | ||
| for (int i = 0; i < 5; i++) { | ||
| threadPool.execute(() -> { | ||
| for (int j = 0; j < 500; j++) { | ||
| volatileAtomicityDemo.add(); | ||
| } | ||
| }); | ||
| } | ||
| // 等待 1.5 秒，保证上面程序执行完成 | ||
| Thread.sleep(1500); | ||
| System.out.println(count); | ||
| threadPool.shutdown(); | ||
| } | ||
|
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| } |
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