Question

I NEED A JAVA PROGRAM TO IMPLEMENT THE CONCEPT OF INDEX,
if we have an DB file has a records of students number and names like this

(Student file)
stNum**stName
1 jack
2 maya
3 sam
4 alex
5 jane
. .
. .
. .

this file may have a thousands records, if we want to search for a specific record(student),
we need to find it by (Index file), in this index file we have this

(Index file)
stNum**Address
1 (address or the record num from the Student file)
. .
. .
. .

so here we need to write a program with JAVA
to make it easy to find this specific record.

Answer 1

Implementation in JAVA:

Code:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class Student_Index {

   public static void main(String[] args) throws FileNotFoundException {
      
      
//       Student file class and its address
       File stufile = new File("C:\\Users\\Ankit\\Desktop\\sname.txt");
         
//       creating Student name's Scanner class object
           Scanner ss = new Scanner(stufile);
          
          
//               Address file class and its address
       File addfile = new File("C:\\Users\\Ankit\\Desktop\\address.txt");
         
//           creating Student Address's Scanner class object
       Scanner sa = new Scanner(addfile);
          
//       list of type Students
           ArrayList<Students> list= new ArrayList<>();
          
          
//           read file and Store in Arraylist
           try
           {
           while( ss.hasNext() && sa.hasNext() )
           {
              
               String name=ss.next();
              
               String add=sa.next();
                 
               Students s = new Students(name,add);
              
               list.add(s);
              
           }
           }
           finally
           {
           ss.close();
           sa.close();
           }

//           print
      
System.out.println(" Print All The Students Details\n");
      
       System.out.println(" INDEX NAME ADDRESS ");
       System.out.println(" ");
             
       for(int i=0;i<list.size();i++) {
          
           Students st = list.get(i);
          
           System.out.println(" "+(i+1)+" "+st.getname()+" "+st.getaddrs());
          
       }
      
      
//       you can simply get details of any particular student just by using index
//       like that, now i am printing Student at index 3
      
       System.out.println();
       System.out.println("Printing details of Student at index 3 : ");
      
       Students s= list.get((3-1));
      
       System.out.println("Index : 3, Name : "+s.getname()+", Address : "+s.getaddrs() );
      
       System.out.println();
      
      
      
      

   }

}

// class Students
class Students
{
//   instance Variables
   String name;
   String addrs;
  
//   Argumented constructor
   public Students(String name,String addrs){
      
       this.name=name;
       this.addrs=addrs;
   }
  
//   Getters and Setters methods
  
   public String getname()
   {
       return name;
       }
  
  
   public void setname()
   {
       this.name= name;
       }
  
  
   public String getaddrs()
   {
       return addrs;
       }
  
  
   public void setaddrs(String addrs)
   {
       this.addrs= addrs;
       }
  

}

SAMPLE OUTPUT:

FILES:

1. sname.txt

2.address.txt

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