Java统计文件中每个字符出现的个数

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){           //获取字符在文件中出现的个数return map.get(c);}public Set<Character> getAllChar(){     //获取文件中字符的Set集合return map.keySet();}public Map<Character,Integer> getMap(){   //获取字符与其出现个数组成的Map集合return map;}public void printInfo(){                 //打印信息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();}}