feat: 更新 java 示例

Author: dunwu

codes/javacore-concurrent/src/main/java/io/github/dunwu/javacore/concurrent/LaunderThrowable.java

@@ -0,0 +1,33 @@
+package io.github.dunwu.javacore.concurrent.tool.division;
+
+import java.util.Arrays;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * CompletableFuture 创建
+ *
+ * @author <a href="mailto:forbreak@163.com">Zhang Peng</a>
+ * @date 2024-02-21
+ */
+public class CompletableFuture_创建 {
+
+    public static void main(String[] args) {
+        // 无返回值的异步任务
+        CompletableFuture.runAsync(() -> {
+            System.out.println("无返回值的异步任务");
+        }).join();
+
+        // 有返回值的异步任务
+        String res = CompletableFuture.supplyAsync(() -> "有返回值的异步任务").join();
+        System.out.println(res);
+
+        // 指定自定义线程池
+        ExecutorService executor = Executors.newFixedThreadPool(1);
+        String res2 = CompletableFuture.supplyAsync(() -> "自定义线程池且有返回值的异步任务", executor).join();
+        System.out.println(res2);
+        executor.shutdown();
+    }
+
+}