如何使用扫描仪通过char读取输入文件？

I have to use Scanner, so is there a nextChar() instead of nextLine() method that I could use?

我必须使用Scanner,那么我可以使用nextChar()而不是nextLine()方法吗?

Thanks!

4 个解决方案

#1

You can convert in an array of chars.

您可以转换为一组字符。

import java.io.*;
import java.util.Scanner;


public class ScanXan {
    public static void main(String[] args) throws IOException {
        Scanner s = null;
        try {
            s = new Scanner(new BufferedReader(new FileReader("yourFile.txt")));
            while (s.hasNext())
            {
               String str = s.next(); 
                char[] myChar = str.toCharArray();
                // do something
            }
        } finally {
            if (s != null) {
                s.close();
            }
        }
    }

#2

If you have to use a Scanner (as you noted in your edit), try this:

如果您必须使用扫描仪(如编辑中所述),请尝试以下操作:

myScanner.useDelimiter("(?<=.)");

Now myScanner should read character by character.

现在myScanner应逐字逐句阅读。

You might want to use a BufferedReader instead (if you can) - it has a read method that reads a single character. For instance, this will read and print the first character of your file:

您可能希望使用BufferedReader(如果可以) - 它有一个读取单个字符的read方法。例如,这将读取并打印文件的第一个字符:

BufferedReader br = new BufferedReader(new FileReader("somefile.txt"));
System.out.println((char)br.read());
br.close();

#3

Split the line into characters using String.toCharArray().

使用String.toCharArray()将行拆分为字符。

#4

If you're committed to using Scanner then you can use next(String pattern).

如果您致力于使用Scanner,那么您可以使用next(String pattern)。

String character = scanner.next(".");

The above returns a String of length 1 -- that is, you get a character, but as a string.

上面返回一个长度为1的String - 也就是说,你得到一个字符,但是作为一个字符串。

#1