StringTokenizer error: NoSuchelementException after tokenized line finishes

Question

当我从键盘向分词器输入一行时，它没有问题。然而，我试图通过文件行提供我的输入，文件行的名称在两个词之间有一个 space。那是我收到 NoSuchelementException 错误的时候。我不确定是否需要关闭文件？但该文件有更多信息需要阅读。感谢您花时间阅读我的问题:)

代码如下：

System.out.println("Enter your first and last name");
line = sc.nextLine();
System.out.println(line);
StringTokenizer lineTok = new StringTokenizer(line);
first = (String) lineTok.nextToken();
last = (String) lineTok.nextToken();

Answer 1

对我来说效果很好。

package tryouts;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.StringTokenizer;

public class StringTokenizerTest {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner sc = new Scanner(new FileInputStream("/usr/projects/tryouts/src/tryouts/test.txt"));
        String line = sc.nextLine();
        System.out.println(line);
        StringTokenizer lineTok = new StringTokenizer(line);
        String first = (String) lineTok.nextToken();
        System.out.println(first);
        String last = (String) lineTok.nextToken();
        System.out.println(last);
        sc.close();
    }
}

在文件夹“/usr/projects/tryouts/src/tryouts/”中创建一个名为"test.txt"的文件，单行内容为"first second third fourth"并打印第一和第二。

Answer 2

下面的将打印该行中的所有单词。

package tryouts;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.StringTokenizer;

public class StringTokenizerTest {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner sc = new Scanner(new FileInputStream(
                "/usr/projects/tryouts/src/tryouts/test.txt"));
        String line = sc.nextLine();
        System.out.println(line);
        StringTokenizer lineTok = new StringTokenizer(line);
        while (lineTok.hasMoreTokens()) {
            System.out.println(lineTok.nextToken());
        }
        sc.close();
    }
}

StringTokenizer error: NoSuchelementException after tokenized line finishes

StringTokenizer error: NoSuchelementException after tokenized line finishes

java

stringtokenizer