November 4, 2019 class tests, text reads statistics 2 words

I, entitled

 

 Second, the source code

import java.io.*;
import java.util.*;


public class ReadWord2 {
    private static String str1;
    private static String [] Str=new String[20000];
    private static int [] n=new int [20000];
    
    public static void main(String [] args) throws IOException {
        int num=0,i=0,j=0;
        double sum=0;
        Scanner input =new Scanner(System.in);
        
        File file =new File("src/Harry.txt");
        
        String get=null;
        BufferedReader reader =new BufferedReader(new FileReader(file));
        while((get=reader.readLine())!=null) {
            
            StringTokenizer sc =new StringTokenizer(get,",.?''\" -"); 
            while(sc.hasMoreElements()) {
                str1=(String)sc.nextElement();
                str1=str1.toLowerCase();
                for(i=0;i<=num;i++) {
                    if(str1.equals(Str[i])) {
                        n[i]++;
                        break;
                    }
                }
                if(i>num) {
                    Str[num]=str1;
                    n[num]=1;
                    num++;
                }
            }
        }
        
        for(i=0;i<num;i++) {
            for(j=i;j<num;j++) {
                if(n[i]<n[j]) {
                    int temp=n[i];
                    n[i]=n[j];
                    n[j]=temp;
                    String tp=Str[i];
                    Str[i]=Str[j];
                    Str[j]=tp;
                }
                
            }
        }
        i=0;
        while(n[i]!=0) {
            sum+=n[i];
            i++;
        }
        System.out.println("单词总数为"+SUM); 
        System.out.println ( "Enter the number of words before the number you want to check a few" );
         int N = input.nextInt ();
         for (i = 0; i <N; i ++ ) { 
            System. Out.print ( "first" + (i + 1) + " multi-word is" + Str [i] + "total" + n [i] + "a" ); 
            of System.out.print ( "the total word a " ); 
            System.out.printf ( "% .2f ", n-[I] * 100 / SUM); 
            System.out.println ( "% " ); 
        } 
        
        
    } 
    
    
    
    
    
}

Third, experience

　　Some ideas just started really did not, because of the need from the file to every word points out, this is the place where I had a headache. Then, after drawing people's code I found a great way StingTokenizer, a string can be divided according to the custom symbol into a string, and then stored. BufferedReader is then also learned a buffered stream, although not required, but can speed read.