11.12课堂测试1

 1 package practice;
 2 
 3 import java.io.*;
 4 import java.util.*;
 5 import java.text.*;
 6 import java.io.BufferedReader;
 7 import java.io.FileReader;
 8 import java.io.IOException;
 9 import java.text.DecimalFormat;
10 public class test {
11 public static void main(String[] args) throws IOException {
12     BufferedReader br = new BufferedReader(new FileReader("D:\\QQ documents\\JAVA课件/《飘》.txt"));
13     StringBuilder sb = new StringBuilder();
14     while (true) {
15         String line = br.readLine();
16         if (line == null)
17             break;
18         sb.append(line);
19     }
20     br.close();
21     String content = sb.toString();
22     int[] letter=new int[52];
23     String M = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
24     char[] l = new char[52];
25     l = M.toCharArray();
26     for(int i=0;i<content.length();i++) {
27         char ch = content.charAt(i);
28         if(ch>='A'&&ch<='Z') {
29             letter[ch-65]++;
30         }
31         if(ch>='a'&&ch<='z') {
32             letter[ch-71]++;
33         }
34     }
35     int sum=content.length() - content.replaceAll("[a-zA-Z]", "").length();
36     for(int i=0;i<51;i++) {
37         for(int j=0;j<51-i;j++) {
38             if(letter[j]<letter[j+1]) {
39                 int temp1 = letter[j];
40                 letter[j]=letter[j+1];
41                 letter[j+1]=temp1;
42                 char temp2 = l[j];
43                 l[j] = l[j+1];
44                 l[j+1] = temp2;
45             }
46         }
47     }
48     System.out.println("字母总数:"+sum);
49     System.out.println("各字母的频率如下：");
50     for(int i=0;i<52;i++) {
51         double ending = (letter[i])*100/(double)sum;
52 //        System.out.println(letter[i]);
53         System.out.println(l[i]+"出现的频率："+new DecimalFormat("#.##").format(ending)+"%");
54     }
55 //    System.out.println("Character count is:" + (content.length() - content.replaceAll("[a-zA-Z]", "").length()));
56 //    System.out.println("Number count is:" + (content.length() - content.replaceAll("[0-9]", "").length()));
57 //    System.out.println("Special count is :" + content.replaceAll("[\\w ]", "").length());
58     }
59 }

运行的结果如下：

标签：java,io,int,11.12,测试,import,new,课堂,String
来源： https://www.cnblogs.com/SHINIAN200/p/15548320.html