To Implement a Program Retrieval of Documents using Inverted Files

Source Code for Inverted Files in Java Language :

package com.prac.prac;  
 import java.io.BufferedReader;  
 import java.io.FileNotFoundException;  
 import java.io.FileReader;  
 import java.io.IOException;  
 import java.io.InputStreamReader;  
 import java.util.ArrayList;  
 import java.util.StringTokenizer;  
 public class invertedfile   
 {  
      public static void displayIndex(ArrayList invertedData,int[][] docno){  
           int i,j;  
           for(i=0;i                System.out.print(invertedData.get(i)+"\t");  
                for(j=1;j<=docno[i][0];j++)  
                     System.out.print(docno[i][j]+"\t");  
                System.out.print("\n");  
           }  
      }  
      public static void indexing(String fname,ArrayList invertedData,int[][] docno,int fileno)  
      {  
           BufferedReader br;  
           try   
           {  
                br = new BufferedReader(new FileReader(fname));  
                String data = "", line = br.readLine();  
                while(line!=null)  
                {  
                     data+=line+" ";  
                     line=br.readLine();  
                }  
                String[] st=data.split("[ ,.]");  
                String currenttoken=null;  
                int i=0;  
                while(i                {  
                     currenttoken=st[i];  
                     int indx=invertedData.indexOf(currenttoken);  
                     if (indx==-1)  
                     {  
                          invertedData.add(currenttoken);  
                          indx=invertedData.indexOf(currenttoken);  
                          docno[indx][0]=1;  
                          docno[indx][1]=fileno;  
                     }  
                     else  
                     {  
                          docno[indx][docno[indx][0]+1]=fileno;  
                          docno[indx][0]+=1;  
                     }  
                     i+=1;  
                }  
           } catch (Exception e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
           }  
      }  
      public static void main(String[] args) throws NumberFormatException, IOException {  
           String fname="";  
           ArrayList invertedData=new ArrayList();  
           int docno[][]=new int[100][10];  
           InputStreamReader ins=new InputStreamReader(System.in);  
           BufferedReader br=new BufferedReader(ins);  
           System.out.println("\nENTER TOTAL NO OF FILES:");  
           int no=Integer.parseInt(br.readLine());  
           int i=1;  
           while(i-1!=no)  
           {  
                System.out.println("\nENTER FILE "+i+" NAME:");  
                fname=br.readLine();  
                indexing(fname,invertedData,docno,i);  
                i+=1;  
           }  
            displayIndex(invertedData,docno);       
      }  
 }  

Output for the Inverted Files Program:

ENTER TOTAL NO OF FILES:
2


ENTER FILE 1 NAME:
c:\anil1.txt


ENTER FILE 2 NAME:
c:\anil2.txt


hello 1
where 1
are 1 2
you 1 2
anil 2
kumar 2