java - 用一台扫描仪读取两个字符串

Question

我有一个扫描仪，它首先读取标题，然后读取用户输入的两个单词，用空格分开，然后将它们放入导演姓名和导演姓氏中:但是使用下面的代码我收到错误:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at MainSystem.addBook(MainSystem.java:57)
at MainSystem.main(MainSystem.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) 

代码:

private static void addBook() {

    System.out.println("\nEnter title: ");
    title = scanner.next();

    System.out.println("\nEnter director: ");
    String[] parts = scanner.next().split(" ");
    directorName = parts[0];
    directorSurname = parts[1];

}

编辑:为了调用方法 add book 我也早些时候使用了扫描仪 - 也许这是问题所在:

 System.out.println("\nEnter 0 for loading the Library." +
                            "\nEnter 1 for save and quit" +
                            "\nEnter 2 for list all the Books in the Library." +
                            "\nEnter 3 for add Book to the Library.");

int answer = scanner.nextInt();

Answer 1

您需要使用 nextLine 方法获取输入。以下是我在 eclipse 中尝试的工作版本

编辑:根据问题中的新编辑更新了代码。每当给出整数作为输入并按回车键时，换行符就会作为下一个扫描器的输入。因此，在获取输入后编写一个 nextLine() 。更新的代码按照编辑的问题工作。

import java.util.Scanner;

public class Snippet {
static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
    System.out.println("Enter 0 for loading the Library."
            + "\nEnter 1 for save and quit"
            + "\nEnter 2 for list all the Books in the Library."
            + "\nEnter 3 for add Book to the Library.");

    int answer = scanner.nextInt();
    scanner.nextLine();
    if(answer == 3)
        addBook();
}

private static void addBook() {
    System.out.println("Enter title: ");
    String title = scanner.nextLine();
    System.out.println("Enter director: ");
    String[] parts = scanner.nextLine().split(" ");
    String directorName = parts[0];
    String directorSurname = parts[1];
    System.out.println("title : " + title);
    System.out.println("directorname : " + directorName);
    System.out.println("directorsurname : " + directorSurname);
}
}