指定文件目录遍历所有子目录统计文档的单词出现数量

package javaClassHomework;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.TreeSet;

public class test3
{
    //C:\Users\Administrator\Desktop\hhh
   public static void main(String[] args) throws IOException
{
       Scanner sc=new Scanner(System.in);
        File file=getfile();
        bianli(file);
        System.out.println("请选择要查询的文档");
        String name=sc.next();
        display(name);

        
       
        
}
    public static void bianli(File file) {
        File [] yue=file.listFiles();
        for(File fi:yue) {
            if(!fi.isDirectory()) {
            if(fi.getName().endsWith(".txt")) {
                System.out.println(fi.getPath());
            }
            }
            else {
                bianli(fi);
            }
        }
      
    }
   public static void display(String path) throws IOException {
       Scanner sc=new Scanner (System.in);
       BufferedReader br=new BufferedReader(new FileReader(path));        
        int c;
        TreeMap<String,Integer> hm=new TreeMap<>();
        String line;
        int kt=0;
        while((line=br.readLine())!=null) {
            String [] str=line.split("[^a-zA-Z]");            
            for(int i=0;i<str.length;i++) {
                if(!str[i].equals("")) {
            hm.put(str[i],hm.containsKey(str[i])?hm.get(str[i])+1:1);}
            }
            }    
        br.close();
        int max=0;
        int sum=0;
        int t=0;
        for(String k: hm.keySet()) {
            sum=sum+hm.get(k);
            if(max<=hm.get(k)) {
                max=hm.get(k);
            }
          }
       
       TreeSet<String> ts=new TreeSet<>(new Comparator<String>()
        {
           public int compare(String a,String b) {
               int num=hm.get(a)-hm.get(b);
               return num==0?1:(-num);
           }
        });
       for(String k: hm.keySet()) {
           ts.add(k);
       }
       DecimalFormat df = new DecimalFormat("0.00%");
        System.out.println("请输入要查询的个数");
       int count=sc.nextInt();
       int q=0;
       for (String s : ts)
        {
           if(q==count) {
               break;
           }
           else {
               q++;
               float bai=(float)hm.get(s)/sum;
               System.out.println(s+" "+hm.get(s)+" "+df.format(bai));
           }
          
            
        }
          
        
        
        System.out.println(sum);
   }
   public static File getfile() {
       Scanner sc=new Scanner(System.in);
       while(true) {
       String line=sc.nextLine();
       File kk=new File(line);
       if(!kk.exists()) {
           System.out.println("输入的不是文件夹，请重新输入");
       }
       else if(kk.isFile()) {
           System.out.println("输入的是文件路径，请重新输入");
       }
       else {
           return kk;
       }
       
}
}
}