java - Scanner.nextDouble : txt file correctly loaded but "InputMismatchException" occurs

Question

我有一个文本 (file.txt) 文件。此文件加载到扫描仪中。

文件中有不同的行，每一行中有两个 double 值和一个整数值除以空格。

像这样:

1.0 1.2 2
0.9 1.0 10
50.4 9.2 20

我需要完成三个数组。

每个数组对应一个列。像这样的东西:

double[] x = {1.0,0.9,50.4}
double[] y = {1.2,1.0,9.2}
double[] z = {2,10,20}

我尝试使用这段代码:

double x[]= new double [3];
double y[]= new double [3];
double z[]= new double [3];

File f = new File(ClassLoader.getSystemResource(file.txt).toURI());
Scanner sc = new Scanner(f);

for (int i=0;j<3;i++){
  x[i] = sc.nextDouble();
  y[i] = sc.nextDouble();
  z[i] = sc.nextDouble();
}

但是当执行第一个 nextDouble() 时出现“未捕获”(java.util.InputMismatchException)异常。

我做错了什么？

感谢您的任何提示。

Answer 1

你正在解析 doubles 是否与 Locale 有关？

引自 http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html

An instance of this class is capable of scanning numbers in the standard formats as well as in the formats of the scanner's locale. A scanner's initial locale is the value returned by the Locale.getDefault() method; it may be changed via the useLocale(java.util.Locale) method.

因此，例如，这可能会有所帮助:

scanner.useLocale(Locale.ENGLISH);