import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.TreeMap;

/*获取text.txt文本上每个字符出现的次数,将结果写在numberOfCharacter.txt上

* 1.创建带缓冲的输入流对象

* 2.创建双列集合对象TreeMap

* 3.将读到的字符存储在双列集合中,存储时若不包含这个键,就将这个键和1存储,如果包含这个键,就将该键和值加1进行存储

* 4.关闭输入流

* 5.创建输出流对象

* 6.遍历集合将集合中的内容写到numberOfCharacter.txt文件中

* 7.关闭输出流

*/

public class StatisticsOfChar {

public static void main(String[] args) throws IOException {

BufferedReader br = new BufferedReader(new FileReader("text.txt"));

TreeMap<Character, Integer> tm = new TreeMap<>();

int ch;

while ((ch = br.read()) != -1) {

char c = (char)ch;

/*if (tm.containsKey(c)) {

tm.put(c, 1);

}else{

tm.put(c, tm.get(c) + 1);

}*/

tm.put(c, tm.containsKey(c) ? tm.get(c)+1 : 1);

}

br.close();

BufferedWriter bw = new BufferedWriter(new FileWriter("numberOfCharacter.txt"));

for (Character key : tm.keySet()) {

switch (key) {

case '\t':

bw.write("\\t" + ":" + tm.get(key)); //写出键和值

break;

case '\n':

bw.write("\\n" + ":" + tm.get(key));

break;

case '\r':

bw.write("\\r" + ":" + tm.get(key));

break;

case ' ':

bw.write("空格" + ":" + tm.get(key));

break;

default:

bw.write(key + ":" + tm.get(key));

break;

}

bw.newLine();

}

bw.close();

}

}