单词统计

package dao;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class Dao{
    static String str;
    static boolean flag=true;
    static int i;
    static int j;
    static int m;
    static Scanner scan=new Scanner(System.in);
    public static void main(String[] args) {
        System.out.println("运行成功,请稍等!");
        readFile();
        while(flag) {
            System.out.print("输入1查询字母所占的比例，输入2查询占前几个的单词,输入3退出:");
            int n=scan.nextInt();
            switch(n) {
            case 1:
                findletter();//查询字母所占比例
                break;
            case 2:
                findword();//查询单词所占的比例
                break;
            case 3:
                System.out.println("退出成功!");
                flag=false;
                break;
            }
        }
    }
    public static  void readFile() {
        String pathname = "Harry Potter and the Sorcerer‘s Stone.txt"; //这里为要统计的文本文档名，同时需要将该文档导入到本工程中
try (FileReader reader = new FileReader(pathname);
             BufferedReader br = new BufferedReader(reader) 
        ) {
            String line;
            while ((line = br.readLine()) != null) {
                str+=line;
            }
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void findletter() {
        char s[]=str.toCharArray();
        int[] a=new int[52];
        char[] b=new char[52];
        String str1="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        b=str1.toCharArray();
        for(j=0;j<str.length();j++) {
            if(s[j]>=‘a‘&&s[j]<=‘z‘) {
                m=s[j]-‘a‘;
                a[m]++;
            }
            else if(s[j]>=‘A‘&&s[j]<=‘Z‘) {
                m=s[j]-‘A‘+26;
                a[m]++;
            }
        }
        int t = 0;
        char ts;
        for(i=0;i<52;i++) {
            for(j=i+1;j<52;j++) {
                if(a[i]<a[j]) {
                    t=a[i];
                    a[i]=a[j];
                    a[j]=t;
                    ts=b[i];
                    b[i]=b[j];
                    b[j]=ts;
                }
            }
        }
        double sum=0;
        for(i=0;i<52;i++) {
            sum+=a[i];
        }
        NumberFormat nt = NumberFormat.getPercentInstance(); 
        nt.setMinimumFractionDigits(2);
        for(i=0;i<52;i++) {
            System.out.println(b[i]+" "+nt.format(a[i]/sum*1.0));
        }
    }
    public static void findword() {
        str.toLowerCase(); // 将str转换为小写
        String[] words = str.split("[^(a-zA-Z)]+");  // 非单词的字符来分割，得到所有单词
        Map<String ,Integer> map = new HashMap<String, Integer>() ;
        for(String word :words){
            if(map.get(word)==null){  // 若不存在说明是第一次，则加入到map,出现次数为1
                map.put(word,1);
            }else{
                map.put(word,map.get(word)+1);  // 若存在，次数累加1
            }
        }
        // 排序
       List<Map.Entry<String ,Integer>> list = new ArrayList<Map.Entry<String,Integer>>(map.entrySet());
        Comparator<Map.Entry<String,Integer>> comparator = new Comparator<Map.Entry<String, Integer>>() {
            public int compare(Map.Entry<String, Integer> left, Map.Entry<String, Integer> right) {
             int i=left.getValue()-right.getValue();
                if(i==0) {
                 return (right.getKey().compareTo(left.getKey()));
                }
                return (left.getValue().compareTo(right.getValue()));
            }
        };
      
        // 集合默认升序
        Collections.sort(list,comparator);
        int n=list.size();
        System.out.println("一共有"+n+"种单词");
        System.out.println("请输入你要排序前几个单词：");
        Scanner scanner=new Scanner(System.in);
        n=scanner.nextInt();
        for(int i=0;i<n;i++){// 由高到低输出
            System.out.println(list.get(list.size()-i-1).getKey() +":"+list.get(list.size()-i-1).getValue());
        }    
    }
}