Question

好的，所以我很清楚您可以使用扫描仪读取输入和设置输出。但是，我使用的是多类包。在一个类中，我有一个具有未定义参数的抽象方法。输入无效参数时，它会抛出异常消息。

public class PersonalContact extends Contact
{
/*These are constants reserved for this class,
 * they can be called in this method, but never changed
 * in sub-classes.
 */
private String address;
private String city;
private String state;
private String zip;
// static limiters
private static int AGEMIN = 1;
private static int AGEMAX = 100;
private static int STATEMAX = 2;
private static int ZIPMAX = 5;
private static int CHARMAX = 30;

public PersonalContact(String name, int age, String address, String city, String state, String zip) 
{
    super(name, age);

    //We use the CHARMAX constant to prevent idiots from holding down the spacebar for +30 characters
    if (name.isEmpty() || name == null || name.length() > CHARMAX)
    {
        throw new NullPointerException("You must enter a name value. ");
    }

    else if (age > AGEMAX || age < AGEMIN)
    {
        throw new IllegalStateException("Please enter an age between 1 and 100");
    }

    else if (address.isEmpty() || address == null || address.length() > CHARMAX)
    {
        throw new NullPointerException("You must provide your address. ");
    }

    else if (city.isEmpty() || city == null || city.length() > CHARMAX)
    {
        throw new NullPointerException("You must provide your city name. ");
    }

    else if (state.isEmpty() || state == null || state.length() > STATEMAX )
    {
        throw new IllegalStateException("You must provide your abbreviated state name. ");
    }

    else if (zip.isEmpty() || zip == null || zip.length() > ZIPMAX )
    {
        throw new IllegalStateException("You must provide a 5 digit zipcode. ");
    }
    this.address = address;
    this.city = city;
    this.state = state;
    this.zip = zip; 
}
}

在我的驱动程序类（运行所有类的类）中，我有一个set方法，它有“try”和“catch”来查看错误，如果出现错误则返回（抛出）一条消息。有用！但是，我想知道如何使用Scanner在使用PersonalContact类中的方法时在驱动程序类中设置输入。我试过了，它不会让我。我已经找到了答案，但我什么都没得到。请帮帮我？

public class Driver
{
    public static void personalConsole()
    {
    try
    {

        Contact personals = new PersonalContact("Robert", 22, "", "Seattle", "WA", "98144");

        System.out.println(personals);
    }
    catch (RuntimeException ex)
    {
        System.out.println(ex.getMessage());
    }
    System.out.println("");
    System.out.println("Process Complete!");

}
}

我已经找到了答案，但我什么都没得到。请帮帮我？

Answer 1

无视，我想通了

我应该设置两个不同的扫描仪对象在try＆＃34;方法＆＃34;之前防止输入重叠（扫描仪不喜欢在string和int之间交替）已定义。

 public static void personalConsole()
    {
        Scanner scanner = new Scanner(System.in);
        Scanner scanint = new Scanner(System.in);
        try
        {
            System.out.println("Enter a name: ");
            String name = scanner.nextLine();
            System.out.println("Enter an age: ");
            int age = scanint.nextInt();
            System.out.println("Enter an address: ");
            String address = scanner.nextLine();
            System.out.println("Enter a city: ");
            String city = scanner.next();
            System.out.println("Enter an state: ");
            String state = scanner.next();
            System.out.println("Enter a zipcode: ");
            String zip = scanner.next();

    Contact personals = new PersonalContact(name, age, address, city, state, zip);

        System.out.println(personals);
    }
    catch (RuntimeException ex)
    {
        System.out.println(ex.getMessage());
    }
    System.out.println("");
    System.out.println("Process Complete!");

}

对于来自不同类的Method，使用Driver类的Scanner输入

1 个答案: