个人作业8-单词统计

统计在一篇文章中单词出现的频率

package com.Chazhao;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.text.DecimalFormat;
public class test{
    public static void main(String[]args) throws IOException{
        DecimalFormat format=new DecimalFormat("0.00");
        StringBuffer str=new StringBuffer("");
        File file=new File("C:\\Users\\hp\\Desktop\\JAVA.txt");
        int sum[]=new int[26];
        @SuppressWarnings("unused")
        int th=0;
        int k=0;
        try {
            @SuppressWarnings("resource")
            FileReader fr=new FileReader(file);
            int ch=0;
            while((ch=fr.read())!=-1)
                str.append((char)ch);
        }catch (FileNotFoundException e) {
            e.printStackTrace();
        }
            for(int i=0;i<str.length();i++) {
                char c=str.charAt(i);
                if(Character.isLetter(c)) {
                    if(c=='t'&&str.charAt(i+1)=='h'&&str.charAt(i+2)=='e')
                        th++;
                    int a=(int)c;
                    if(Character.isLowerCase(c))
                        k=a-97;
                    else
                        k=a-65;
                    sum[k]++;
                }
            }
            for(int i=0;i<26;i++)
                if(sum[i]!=0)
                    System.out.println((char)(65+i)+"出现频率为"+format.format((double)sum[i]/str.length()*100)+"%");
                    
        }
            
    }