阅读文本文件，并存储每个单个字符发生 [英] Read a text file and store every single character occurrence

问题描述

我想作一个java程序来读取一个文本文件，并存储每个单个字符发生。因此，这将占到标点符号，字母，数字，大写，小写等。
给定一个文本文件，如：

I would like to make a java program that will read a text file and store every single character occurrence. So it will account for punctuation, letters, numbers,uppercase, lowercase ect. Given a text file like:

玫瑰是红色的，

紫罗兰是蓝色的。

打印值将是这样的：

R：1。

R：3

我：1

，1

[等]

到目前为止，我能够读取文件并计算字数，行数，字符。

So far I am able to read a file and count words, lines, chars.

package Exercise3;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.io.*;
    public class StringTokenizerDemo1
    {
        public static void main(String[] args) throws IOException
        {
            Scanner keyboard = new Scanner(System.in);
            File file = new File("C://Users//guy//Desktop//Practice.txt");
            Scanner inputFile = new Scanner(file);
            String line, word;
            StringTokenizer token;
            int words = 0; //word count 
            int lines = 0; //line count
            int chars = 0; //char count 
            while (inputFile.hasNext())
            {
                lines++; //add one to line count 
                line = inputFile.nextLine();
                token = new StringTokenizer(line, " ");
                while (token.hasMoreTokens())
                {
                    words++; //add one word count 
                    word = token.nextToken();
                    chars+= word.length(); //add to char count 
                }
            }
        }
    }

我还没学会哈希映射/表或树状图;寻找有关如何存储使用数组，数组列表或LinkedList的所有字符类型和它们要么出现一些建议。

I have not learned hash maps/tables or treemaps; looking for some advice on how to store all char types and their occurrences either using an array,arraylist or linkedlist.

推荐答案

这将统计每个字符的出现在一个数组结果
    公共类爵士{

This will count the occurrences of each character in an array
public class jazz {

    public static void main(String[] args) {
        String [] arr = {"a", "b", "a","c", "d"}; 
        HashMap<String, Integer> map = new HashMap<String,Integer>(); 
         for (String i : arr) {
                if (map.get(i) == null) {
                    map.put(i, 1);
                } else {
                    map.put(i, map.get(i) + 1);
                }
         }

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