Question

我试图提示用户输入文件名并搜索文件名并将其保存为2个二维数组。

文件示例为：

BBBBB
BBBBB
BBBBB
BBBBB

public class maze_2D{
static Scanner s = new Scanner(System.in);

public static void FromFile() throws Exception{//
  System.out.println("Enter File name");
   String file = s.nextLine();
   File f = new java.io.File(file);
   Scanner scanner = new Scanner(f);
   // Read from file.....

但是当我运行程序时，我收到错误

Enter Filename
java.io.FileNotFoundException:

为什么会发生这种情况，为什么这个扫描仪不允许我输入任何文件名？

Answer 1

在命令提示符下输入文件名时，会在文件系统中为#using a stub to facilitate accessing the URLs later with # an absolute address stub = 'https://www.beeradvocate.com' beer <- read_html(paste0(stub, '/lists/top/')) lnx = beer %>% html_nodes('a') %>% html_attr('href') %>% #this pattern matches beer profile links -- # the first . is a brewery ID, the second . # is a beer ID within that brewery grep('profile/.*/.*/', ., value = TRUE) %>% paste0(stub, .) head(lnx) # [1] "https://www.beeradvocate.com/beer/profile/23222/78820/" # [2] "https://www.beeradvocate.com/beer/profile/28743/136936/" # [3] "https://www.beeradvocate.com/beer/profile/28743/146770/" # [4] "https://www.beeradvocate.com/beer/profile/28743/87846/" # [5] "https://www.beeradvocate.com/beer/profile/863/21690/" # [6] "https://www.beeradvocate.com/beer/profile/17981/110635/"提供文件所在的full path。

file name with extension

Answer 2

我使用你的大部分代码制作了一个小小的广告，它工作得很好...尝试检查你的路径+文件名，以确保它真的存在。

我听说过scanner.getInteger强制你在它之后添加一个scanner.nextLine（），但你正在使用nextLine到fileName所以不应该这样。

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扫描仪不允许我输入文件名

2 个答案: