我已经创建了3个对数据库执行查询的函数，然后我想得到每个结果并将其添加到一个对象列表中，但是结果总是空的，如何才能正确地做到这一点？我是这样做的：
我创建了3个可完成的未来函数：

private CompletableFuture<List<TransSalesOrderOnlyResponseDto>> findPureUnAssignedSO() {
    return CompletableFuture.supplyAsync(() -> iSalesOrderMapper.entityToSOOnlyDto(iTransSalesOrderQdslRepository.findUnAssignedSalesOrder()));
}
private CompletableFuture<List<TransSalesOrderOnlyResponseDto>> findSOHaveItemLeftOverOnly() {
    return CompletableFuture.supplyAsync(() -> {
        List<TransSalesOrder> transSalesOrders = iTransSalesOrderQdslRepository.findSOHaveLeftOverButDone();
        return buildTransSalesOrdersResponseNew(transSalesOrders);
    });
}
private CompletableFuture<List<TransSalesOrderOnlyResponseDto>> findSalesOrderWithBpsjInDeliveryOrder() {
    return CompletableFuture.supplyAsync(() -> {
        List<TransSalesOrder> transSalesOrders = iTransSalesOrderQdslRepository.findSalesOrderWithBpsjInDeliveryOrder();
        return buildTransSalesOrdersBpsjOnlyResponseNew(transSalesOrders); 
    });
}

然后我试着执行3个函数：
尝试1，使用get（）：

public List<TransSalesOrderOnlyResponseDto> findUnAssignedSO() {
    CompletableFuture<List<TransSalesOrderOnlyResponseDto>> future = new CompletableFuture<>();
    List<TransSalesOrderOnlyResponseDto> transSalesOrdersResponseNew = new ArrayList<>();
    try {
        transSalesOrdersResponseNew = findSOHaveItemLeftOverOnly().get();
        transSalesOrdersResponseNew.addAll(findPureUnAssignedSO().get());
        transSalesOrdersResponseNew.addAll(findSalesOrderWithBpsjInDeliveryOrder().get());
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
    }
    return transSalesOrdersResponseNew;
}

结果仍然是空的
尝试2：

public List<TransSalesOrderOnlyResponseDto> findUnAssignedSO() {
    List<TransSalesOrderOnlyResponseDto> transSalesOrdersResponseNew = new ArrayList<>();
    CompletableFuture<List<TransSalesOrderOnlyResponseDto>> soHaveItemLeftOverOnly = findSOHaveItemLeftOverOnly();
    CompletableFuture<List<TransSalesOrderOnlyResponseDto>> pureUnAssignedSO = findPureUnAssignedSO();
    CompletableFuture<List<TransSalesOrderOnlyResponseDto>> salesOrderWithBpsjInDeliveryOrder = findSalesOrderWithBpsjInDeliveryOrder();
    CompletableFuture.allOf(soHaveItemLeftOverOnly, pureUnAssignedSO, salesOrderWithBpsjInDeliveryOrder)
            .thenRun(() -> {
                transSalesOrdersResponseNew.addAll(soHaveItemLeftOverOnly.join());
                transSalesOrdersResponseNew.addAll(pureUnAssignedSO.join());
                transSalesOrdersResponseNew.addAll(salesOrderWithBpsjInDeliveryOrder.join());
                });
    }
    return transSalesOrdersResponseNew;
}

如果我这样做，结果总是空的，即使我使用.get（）来阻止结果，如何正确地执行completablefuture？