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### CompletableFuture ```java import java.util.concurrent.CompletableFuture; public class CompletableFutureExample { public static void main(String[] args) { // 創建一個CompletableFuture並在另一個執行緒中執行一個供應器，返回字串"Hello" CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> { return "Hello"; }).thenApplyAsync(result -> { // 使用thenApplyAsync方法對"Hello"進行處理，返回"Hello World" return result + " World"; }); // 當CompletableFuture完成後執行操作，印出結果"Hello World" future.thenAccept(result -> { System.out.println(result); // Hello World }); // 等待CompletableFuture完成 future.join(); } } ```
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