Question

如何修改此代码，以便仅在遍历整个列表后才打印出无效消息。我当前的问题是，每当没有匹配项时，它就会打印出这些消息。这不是我打算要做的。

public void assignSchedule(Depot depotName) throws Exception {
        String client, driver;
        Boolean exit = false;

        do {
            System.out.printf("%-10s %-10s %10s %n", "Client", "Start Date", "End Date");
            depotName.listWorkSchedulue();
            System.out.print("Enter the client name for the schedule you wish to assign: ");
            client = DepotSystem.input.nextLine();

            for (WorkSchedule ws : depotName.getWorkSchedules())
            {
                if (client.equals(ws.getClient()))
                {
                    System.out.printf("%n%20s%n", "Drivers");
                    depotName.listDrivers();
                    System.out.print("Which Driver do you want to assign this to: ");
                    driver = DepotSystem.input.nextLine();

                    for (Driver drivers : depotName.getDrivers())
                    {
                        if (driver.equals(drivers.userName) && !drivers.assigned)
                        {
                            System.out.printf("%nThe work schedule for client %s is now assigned to %s%n ", client,
                                driver);
                            depotName.getDriver(driver).setSchedule(depotName.getWorkSchedule(client));
                            drivers.setAssigned(true);
                            exit = true;
                        } else if ((!driver.equals(drivers.userName) && drivers.assigned)) {
                            System.out.printf("%nEither not a valid driver or Driver is already assigned a Job.%n");
                        }
                    }
                } else if (!client.equals(ws.getClient())) {
                    System.out.printf("%nPlease enter a valid client.%n");
                }
            }
        } while (!exit);
    }

如果我输入了不正确的名称，当前输出如下所示

Client     Start Date   End Date 
Gary       2020-04-25   2020-04-27
Bob        2020-05-05   2020-05-06
Enter the client name for the schedule you wish to assign: f

Please enter a valid client.

Please enter a valid client.

这是我希望输入错误名称时可以使用的方式。

Client     Start Date   End Date 
Gary       2020-04-25   2020-04-27
Bob        2020-05-05   2020-05-06
Enter the client name for the schedule you wish to assign: f

Please enter a valid client.

Answer 1

在for循环的顶部，您可以执行以下操作以确定是否有任何工作计划包含输入的客户。随后，您可以将PipelineOptions po = ??? List<Configuration> configs = ??? HadoopFileSystemOptions options = po.as(HadoopFileSystemOptions.class); options.setHdfsConfiguration(configs); org.apache.beam.sdk.io.FileSystems.setDefaultPipelineOptions(options);替换为clientSchedules并删除条件depotName.getWorkSchedules()，因为我们知道它们都是同一客户的日程表。

请注意，该问题未包含完整的SSCCE，缺少许多需要编译的基本类，因此可能会出现意外的编译错误。

if (client.equals(ws.getClient()))

Answer 2

消息Please enter a valid client应该在for循环之外打印。请执行以下操作：

public void assignSchedule(Depot depotName) throws Exception {
    String client, driver;
    Boolean exit = false, validClient;

    do {
        System.out.printf("%-10s %-10s %10s %n", "Client", "Start Date", "End Date");
        depotName.listWorkSchedulue();
        System.out.print("Enter the client name for the schedule you wish to assign: ");
        client = DepotSystem.input.nextLine();

        for (WorkSchedule ws : depotName.getWorkSchedules()) {
            if (client.equals(ws.getClient())) {
                validClient = true;
                System.out.printf("%n%20s%n", "Drivers");
                depotName.listDrivers();
                System.out.print("Which Driver do you want to assign this to: ");
                driver = DepotSystem.input.nextLine();

                for (Driver drivers : depotName.getDrivers()) {
                    if (driver.equals(drivers.userName) && !drivers.assigned) {
                        System.out.printf("%nThe work schedule for client %s is now assigned to %s%n ", client,
                                driver);
                        depotName.getDriver(driver).setSchedule(depotName.getWorkSchedule(client));
                        drivers.setAssigned(true);
                        exit = true;
                    } else if ((!driver.equals(drivers.userName) && drivers.assigned)) {
                        System.out.printf("%nEither not a valid driver or Driver is already assigned a Job.%n");
                    }
                }
            } else {
                validClient = false;
            }
        }
        if (!validClient) {
            System.out.printf("%nPlease enter a valid client.%n");
        }
    } while (!exit);
}

Answer 3

在循环外声明一个布尔值，并将其设置为else if条件，并在else中检查此布尔值，例如

 else if (condition && !booleanVariable) {
          System.out.printf("%nPlease enter a valid client.%n");
           booleanVariable = true;
           }

Arraylist中每个项目的嵌套For-each循环打印

3 个答案: