Java中CompletableFuture错误的处理方法

CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
    // 异步操作
    throw new RuntimeException("Some error occurred");
});

CompletableFuture<Integer> result = future.exceptionally(ex -> {
    System.out.println("Error: " + ex.getMessage());
    return 0; // 返回默认值
});

System.out.println(result.join()); // 输出: 0

CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
    // 异步操作
    throw new RuntimeException("Some error occurred");
});

CompletableFuture<Integer> result = future.handle((res, ex) -> {
    if (ex != null) {
        System.out.println("Error: " + ex.getMessage());
        return 0; // 返回默认值
    } else {
        return res * 2; // 处理正常结果
    }
});

System.out.println(result.join()); // 输出: 0

CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
    // 异步操作
    throw new RuntimeException("Some error occurred");
});

CompletableFuture<Integer> result = future.whenComplete((res, ex) -> {
    if (ex != null) {
        System.out.println("Error: " + ex.getMessage());
    }
});

System.out.println(result.join()); // 抛出异常：java.lang.RuntimeException: Some error occurred