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我刚开始学习和“玩”一点java。我是一名计算机工程专业的学生（去年我们学习了 C）。但是，今天我在“从文件扫描”方面遇到了一些问题。我在 Eclipse 中工作，在我创建了一个包含以下内容的文件文本“in.txt”之后：

20 31,12 Luca

我遇到了编译器给出的相同错误：

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextDouble(Scanner.java:2413)
at it.devapp.corsojava.esempi.FileScanner.main(FileScanner.java:20)

重点是什么？我找不到错误。这是代码：

public class FileScanner {

public static void main(String[] args) 

        throws FileNotFoundException { // needed for file operations

    int num1;
    double num2;
    String name;
    double sum;
    // Scanning input operations

    Scanner in = new Scanner(new File("in.txt"));

    num1 = in.nextInt();
    num2 = in.nextDouble();
    name = in.next();

    // Display
    sum = num1 + num2;
    System.out.println("The integer read is: " + num1);
    System.out.println("The floating point number read is: " + num2);
    System.out.println("The string read is: " + name);
    System.out.println("Hi " + name +", the sum of " + num1 + " and " + num2  + " is: " + sum );
    in.close();
    }
 }

谢谢大家！:)

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