Question

我是爱尔兰当地科技公司的第一年学生。我们正如你猜测做的那样，目前我们正在处理扫描仪。我在底部添加了我的代码并且有点困惑。

当我运行该程序时，它工作正常，直到我进入＆＃34;输入国家＆＃34;和＃34;进入课程＆＃34;并且无论我将扫描仪更改为f.nextLine还是f.next，这两行都会一起打印。

任何人都可以帮助我解决这个问题，因为我错过了一些东西而且我无法弄清楚它是什么。

非常感谢

马修

public static void main(String[] args) 
{
    String name; //declaring string name
    String town; //declaring string town
    double dist; //declaring double distance from AIT the person lives
    int age; //declaring their age 
    double height; //declaring their height
    double weight; //declaring their weight
    String country; //declaring their country that they are from
    String course; //declaring their course that they are taking 
    int years; //declaring the amount of years they are in the course
    String sNum; //declaring there email address string

    Scanner f = new Scanner(System.in);
    //Scanner s = new Scanner(System.in);
    // below is the prompt for all the information and there keyboard input with scanner
    System.out.print("Enter your name here & press enter: "); 
    name = f.nextLine();

    System.out.print("Enter the name of the town or city you live in & press enter: ");
    town = f.nextLine();

    System.out.print("Enter the distance from AIT that you live in kilometers & press enter: ");
    dist = f.nextDouble();

    System.out.print("Enter your age & press enter: ");
    age = f.nextInt();

    System.out.print("Enter your height & press enter: ");
    height = f.nextDouble();

    System.out.print("Enter your weight & press enter: ");
    weight = f.nextDouble();

    System.out.print("Enter the name of country that you are from & press enter: ");
    country = f.nextLine();

    System.out.print("Enter the name of course you are taking & press enter: ");
    course = f.nextLine();

    System.out.print("Enter the number of years the course is & press enter: ");
    years = f.nextInt();

    System.out.print("Enter your student number & press enter: ");
    sNum = f.next();

    //all the outputs of the information collected
    System.out.println("Your name: "+name+" Town: "+town);
    System.out.println(town+" is "+dist+" away from AIT.");
    System.out.println("You are "+height+" meters tall & "+weight+" kgs & you are a "+country+" citizen.");
    System.out.println("Your studying "+course+" for "+years+" years at AIT.");
    System.out.println("Your student number is "+sNum+" & your student email address is         "+sNum+"@student.ait.ie");
    System.out.println("Please review the information.");
}

Answer 1

nextDouble（）扫描下一个标记并将其解析为double。这就是你面临这个问题的原因。你可以简单地将nextLine（）移到nextDouble（）之上。它是解决问题的临时解决方案。

尝试以下代码。我刚编辑了你的代码。

public static void main(String[] args) 
{
    String name; //declaring string name
    String town; //declaring string town
    double dist; //declaring double distance from AIT the person lives
    int age; //declaring their age 
    double height; //declaring their height
    double weight; //declaring their weight
    String country; //declaring their country that they are from
    String course; //declaring their course that they are taking 
    int years; //declaring the amount of years they are in the course
    String sNum; //declaring there email address string

    Scanner f = new Scanner(System.in);
    //Scanner s = new Scanner(System.in);
    // below is the prompt for all the information and there keyboard input with scanner
    System.out.print("Enter your name here & press enter: "); 
    name = f.nextLine();

    System.out.print("Enter the name of the town or city you live in & press enter: ");
    town = f.nextLine();

        System.out.print("Enter the name of country that you are from & press enter: ");
    country = f.nextLine();

    System.out.print("Enter the name of course you are taking & press enter: ");
    course = f.nextLine();

    System.out.print("Enter the number of years the course is & press enter: ");
    years = f.nextInt();

    System.out.print("Enter your student number & press enter: ");
    sNum = f.next();

    System.out.print("Enter the distance from AIT that you live in kilometers & press enter: ");
    dist = f.nextDouble();

    System.out.print("Enter your age & press enter: ");
    age = f.nextInt();

    System.out.print("Enter your height & press enter: ");
    height = f.nextDouble();

    System.out.print("Enter your weight & press enter: ");
    weight = f.nextDouble();



    //all the outputs of the information collected
    System.out.println("Your name: "+name+" Town: "+town);
    System.out.println(town+" is "+dist+" away from AIT.");
    System.out.println("You are "+height+" meters tall & "+weight+" kgs & you are a "+country+" citizen.");
    System.out.println("Your studying "+course+" for "+years+" years at AIT.");
    System.out.println("Your student number is "+sNum+" & your student email address is         "+sNum+"@student.ait.ie");
    System.out.println("Please review the information.");

    }
    }

Answer 2

如果您使用

    System.out.print("Enter the name of country that you are from & press enter: ");
    country = f.next();
    System.out.print("Enter the name of course you are taking & press enter: ");
    course = f.next();

它会起作用。您也可以为其他nextLine执行此操作。出于某种原因，您将学生编号读作字符串而不是数字，但由于您将所有输入视为字符串，因此您只需使用next即可。

修改

不要忘记致电f.close()关闭扫描仪。

扫描仪多输入问题

2 个答案: