为什么扫描仪无法读取单词之间的任何（空）space（在我的特定情况下）？

Question

我的程序会要求用户输入 his/her 姓名。目前我的扫描仪对象只能读取一个单词。但是如果用户输入了多个单词（比如说某人的全名），那么它就会抛出异常。像这样：

我该如何解决这个问题？

我的代码：

    public class BankApp_Assignment {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int userChoose;
        String name = null;
        int accNum = 0;
        double InitiateAmount = 0;
        double newAmm = 0;

        double depOrWith = 0;
        System.out.println("WELCOME TO OUR BANK!\n\n"
                + "...................\n"
                + "...................\n\n"
                + "Choose your optiin:\n"
                + "1. Create new account\n"
                + "2. Deposit\n"
                + "3. View details\n"
                + "4. Quit\n\n");
        while (true) {
            userChoose = sc.nextInt();

            if (userChoose == 1) {

                System.out.println("Enter your full name:");

                name = sc.next();
                System.out.println("Choose an account number:");

                accNum = sc.nextInt();
                System.out.println("Enter an initiating amount:");

                InitiateAmount = sc.nextDouble();
                System.out.println("\n-----------\n"
                        + "------------");
            } else if (userChoose == 2) {

                System.out.println("Enter negative value to withdraw and positive to deposit");
                depOrWith = sc.nextInt();
                if (depOrWith < 0) {

                    newAmm = InitiateAmount + depOrWith;
                } else {

                    newAmm = InitiateAmount + depOrWith;
                }

                System.out.println("\n-----------\n"
                        + "------------");

            } else if (userChoose == 3) {

                System.out.println("Your name: " + name);
                System.out.println("Your account number: " + accNum);
                System.out.println("Your current balance: " + newAmm);
                System.out.println("\n-----------\n"
                        + "------------");
            } else if (userChoose == 4) {

                System.exit(0);

            }

        }

    }

}

Answer 1

你需要改变

name = sc.next();

sc.next() 将只读到 space 之后什么都没有

name = sc.nextLine();

sc.nextLine() 将读取整行。

请注意，您需要小心跳过阅读 Scanner is skipping nextLine() after using next(), nextInt() or other nextFoo() methods。

为什么扫描仪无法读取单词之间的任何（空）space（在我的特定情况下）？

Why scanner can't read any (empty) space between words (in my specific case)?

java

user-input

java.util.scanner