文件和流课堂实验二

package test;
import java.io.File;  
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter; 
public class readIO1 {
    static int num=0,a=0;
    static String word[]=new String[1000000];
    static int wordnum[]=new int[1000000];
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入要显示的单词个数：");
        int sum=in.nextInt();
        try{
            String path = "C:\\\\Users\\\\lenovo\\\\Desktop\\\\Harry Potter and the Sorcerer's Stone.txt";
            File file = new File(path);    
            InputStreamReader reader = new InputStreamReader(new FileInputStream(file));
            BufferedReader br = new BufferedReader(new FileReader(file));
            File file2 = new File("Test1.txt");
            file2.createNewFile();
            BufferedWriter out = new BufferedWriter(new FileWriter(file2));
            String s="";
            s=br.readLine();
            while(s!=null) {
                s=s.toLowerCase();// 大写转小写
                StringTokenizer st = new StringTokenizer(s," \".,?;!\r\n:“”‘: ");
               while(st.hasMoreElements()) {
               String str =(String)st.nextElement();
                for(int j=0;j<num;j++) {
                    if(str.equals(word[j])) {
                        wordnum[j]++;
                        }else a++;
                    }
                if(a==num) {
                    word[num]=str;
                    wordnum[num]++;
                    num++;
                    }
                a=0;
                }
               s=br.readLine();
            }
            for(int i=0;i<num;i++) {
                for(int j=i+1;j<num;j++) {
                    if(wordnum[j]>wordnum[i]) {
                        int temp=wordnum[i];
                        wordnum[i]=wordnum[j];
                        wordnum[j]=temp;
                        String Temp=word[i];
                        word[i]=word[j];
                        word[j]=Temp;
                    }
                }
            }
            for(int i=0;i<sum;i++) {
                System.out.println(word[i]+" "+wordnum[i]);
            }
            for(int i=0;i<word.length;i++) {
                out.write(i+":"+word[i]+" ");
                out.flush();    
            }
            out.close();
            }catch(Exception e){
                e.printStackTrace();
                }
    }
    
}

实验截图：

 

 

 

 实验主要难在文件中单词的分割，将这个问题解决之后就可以将所读单词存入数组，将其统一变为小写，然后比较计数。