指定目录文件特殊字符字数统计

package com.itheima.test6;


import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;


public class Test2 {
private static Map<String, Integer>  map = new HashMap<>();;


public static void main(String[] args) throws IOException {
//35、 统计本项目中(所有java文件中)每个字母出现的次数（不用按照字母的顺序排列），按照如下格式打印：
// a(1000)b(2000)c(3000)d(4000)..

File file = new File("E:\\AllCode\\scendCode\\testeaxm");

getAllZiMuCount(file);
 
Set<String> keySet = map.keySet();
for (String string : keySet) {
System.out.print(string+"("+map.get(string)+")");
}
}


private static void getAllZiMuCount(File file) throws IOException {

File[] listFiles = file.listFiles();

if (listFiles != null) {
for (File filelist : listFiles) {

if (filelist.isFile()) {

if (filelist.getName().endsWith(".java")) {
//开始读取此文件
File file2 = new File(file, filelist.getName());
//一次读一行
// System.out.println(file2);
BufferedReader br = new BufferedReader(new BufferedReader(new FileReader(file2)));
String line;
while((line = br.readLine()) != null){
for (int i = 0; i < line.length(); i++) {
char charAt = line.charAt(i);

String string = charAt+"";
boolean matches = Pattern.matches("[a-zA-Z]",string );
if (matches) {
if (map != null) {
Integer integer = map.get(charAt+"");
if (integer != null) {
integer++;
map.put(charAt+"", integer);
}else{
map.put(charAt+"", 1);
}
}
}

}
}
br.close(); 
}
}else {
getAllZiMuCount(filelist);
}
}

}
}
}