File and Stream classroom third experiment

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[]) {
		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<num;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 (); 
		    	} 
	} 
	
}

　　Screenshot experiment:

 

 Third experiment is to set a global variable in the experiment two basis as long as the words are not the same as it is stored in an array of its value plus one, the number of cycles that the output value can be changed to set.