java the number of occurrences per character in the statistics file

In this paper, we share the specific code of the number of characters in java statistical files for your reference. The specific contents are as follows

package com.zhu.io;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
 
public class FileCharacter{
 Map<Character,Integer>map=new TreeMap<Character,Integer>();
 public FileCharacter(String fileName) throws IOException{
 BufferedReader br=new BufferedReader(new FileReader(new File(fileName)));
 int x;
 while((x=br.read())>0){
  Character key=new Character((char)x);
  if(map.containsKey(key)){
  int count=map.get(key);
  map.remove(key);
  map.put(key, ++count);
  }else{
  map.put(key, 1);
  }
 }
 }
 public int getCount(char c){      // Gets the number of characters appearing in the file 
 return map.get(c);
 }
 public Set<Character> getAllChar(){   // Object for the characters in the file Set Set 
 return map.keySet();
 }
 public Map<Character,Integer> getMap(){  // Object consisting of a character and its number of occurrences Map Set 
 return map;
 }
 public void printInfo(){         // Print information 
 Set<Map.Entry<Character, Integer>>set=map.entrySet();
 for(Map.Entry<Character, Integer> entry:set){
  System.out.println("[ "+entry.getKey()+" ]"+"\t"+"count:"+entry.getValue());
 }
 }
 public static void main(String[] args) throws IOException {
 FileCharacter fc=new FileCharacter("e:\\test.txt");
 fc.printInfo();
 }
}

This site shares another code for everyone: Calculate the number of times each character appears in a string

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
/**
 *  Calculation 1 Number of occurrences of each character in a string 
 * 
 *  Train of thought :
 *  Pass toCharArray() Get 1 Character array -->
 *  Traversing an array , Use array elements as key, Numerical value 1 As value Deposit map Container -->
 *  If key Repetition , Pass getKey() Get value, Calculation value+1 Post-deposit 
 */
public class Test01 {
  public static void main(String[] args) {
    System.out.println(" Please enter a string: ");
    Scanner sc=new Scanner(System.in);
    while (sc.hasNextLine()){
      String str=sc.nextLine();
      Map<Character,Integer> map =count(str);
      System.out.println(map);
    }
  }
  public static Map<Character,Integer> count(String str){
    Map<Character,Integer> map=new HashMap<Character,Integer>();
    char[] array_char=str.toCharArray();// Convert a string into an array of characters 
    for(char arr_char: array_char){// Traversing an array of characters 
      if(map.containsKey(arr_char)){// Check whether the character is in the map Adj. key If it exists in the 
        Integer old=map.get(arr_char);// Pass key Get value Value of 
        map.put(arr_char,old+1);// Put characters into map Adj. key In, value Set to pass through key Get value Value of +1
      }else{// Check whether the character is in the map Adj. key If it does not exist, put the characters into the map Adj. key In, value The default setting is 1
        map.put(arr_char,1);
      }
    }
    return map;
  }
}