Question

我正在尝试从包含多行“name，int month，int date，int year”信息的文件中读取数据。 Person对象将这些项作为其构造函数参数。但是，当我尝试从文件中读取并填充列表时，我收到以下错误：

Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at lab03.PersonSort.populate(PersonSort.java:56)
    at lab03.PersonSort.main(PersonSort.java:38)

这是我的代码：

   public static void main(String[] args) throws Exception {

    ArrayList<Person> people = new ArrayList<Person>();

    populate(people);
    //selectionSort(people);

    int index = 0;
    while (index < people.size())
    {
        System.out.println(people.get(index));
        index++;
    }

}

public static ArrayList populate(ArrayList<Person> array) {
    final String PERSON_FILE = ".\\src\\Persons.txt";
    Scanner input = new Scanner(PERSON_FILE);

    while (input.hasNext()) {
        String name = input.next();
        int month = input.nextInt();
        int day = input.nextInt();
        int year = input.nextInt();
        Person temp = new Person(name, month, day, year);
        array.add(temp);
    }

    return array;
}

persons.txt文件包含以下内容：

Merli 9 10 1998

Elijah 3 19 2013

Christine 7 29 1981

Annie 8 28 2002

Bella 8 28 2010

马特9 11 1952

Cassidy 8 5 1997

Answer 1

原因是您正在尝试解析字符串＆＃34;。\\ src \\ Persons.txt＆＃34;而不是文件的内容。写Scanner input = new Scanner(new File(PERSON_FILE).toPath());应该解决它。

NoSuchElementException从文件中读取单词和数字

1 个答案: