java - 文本分析中如何消除文本文件中的空格？

Question

我正在尝试让我的程序显示文本文件中字母的频率，目前它正在显示文本文件中每个单词的频率。例如，如果文本文件中的单词是“i am a man”，它会为每个单词“i”、“am”、“a”、“man”输出 4 倍的字母频率。我需要它来分析它全部作为一个单词，因此删除空格并将其视为“iamaman”。

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Answer 1

这不是文本中有空格的问题。事实上，在添加计数之前检查 Character.isLetter() 时，您已经注意忽略空格。

主要来说，您只需将 for 和 while 循环放在迭代 token 的主循环之外进行最终计数。

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

public class J_<countlettersfilereader> {

    public static void main(String[] args)throws Exception {
        // open the file
        Scanner console = new Scanner(System.in);
        System.out.print("What is the name of the text file? ");
        String fileName = console.nextLine();
        Scanner input = new Scanner(new File(fileName));

        //initialize array with 26 elements
        int[] letterArray = new int[26]; 

        while (input.hasNext()) {
            String next = input.next().toLowerCase();

            //run loop for each line incrementing per character
            for (int i = 0; i < next.length(); i++) {
                char characters = next.charAt(i);

                //ignore all characters which aren't alphabetic 
                if (Character.isLetter(characters)) {

                    //if character is uppercase then convert to lowercase
                    characters = Character.toLowerCase(characters);

                    //populate array 
                    int index = characters - 'a';
                    letterArray[index]++;
                }}
        }

        int total = 0;
        for(int i = 0; i < letterArray.length; i ++) {
            total += letterArray[i];
        }

        for (char characters = 'a'; characters <= 'z'; characters++) {
            int index = characters - 'a';
            //print out the analysis
            System.out.println("'" + characters + "' entered " + (((double)letterArray[index] / (double)total) * 100) 
                               + " percent");
        }
    }
}


$ cat abc.txt
a b c

$ java J_
What is the name of the text file? abc.txt
'a' entered 33.33333333333333 percent
'b' entered 33.33333333333333 percent
'c' entered 33.33333333333333 percent
'd' entered 0.0 percent
'e' entered 0.0 percent
'f' entered 0.0 percent
'g' entered 0.0 percent
'h' entered 0.0 percent
'i' entered 0.0 percent
'j' entered 0.0 percent
'k' entered 0.0 percent
'l' entered 0.0 percent
'm' entered 0.0 percent
'n' entered 0.0 percent
'o' entered 0.0 percent
'p' entered 0.0 percent
'q' entered 0.0 percent
'r' entered 0.0 percent
's' entered 0.0 percent
't' entered 0.0 percent
'u' entered 0.0 percent
'v' entered 0.0 percent
'w' entered 0.0 percent
'x' entered 0.0 percent
'y' entered 0.0 percent
'z' entered 0.0 percent