How to edit/modify a line of a text file using java io

Question

Hi every body
I am new 2 java
I am struck in editing a text file that ends with .dat
I successfully added,viewed data of the *.dat file.
but,I cannt edit,delete the lines that i need to do randomly.
Here is the code i have written.
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.StringTokenizer;
public class ReadWriteFile {
     String id=null;
     String name=null;
     String dept=null;
     String doj=null;
     String adrss=null;
     public void WriteFile(String Id,String Name,String Dept,String Doj,String Adrss) throws IOException{
          File f=new File("TraineeDetails.dat");
         if(!f.exists()){
         f.createNewFile();
          BufferedWriter bw=new BufferedWriter(new FileWriter("TraineeDetails.dat",true));
          BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
          System.out.print("Enter Id : ");
          Id=br.readLine();
          System.out.print("Enter name : ");
          Name=br.readLine();
          System.out.print("Enter dept : ");
          Dept=br.readLine();
          System.out.print("Enter doj : ");
          Doj=br.readLine();
          System.out.print("Enter adrss : ");
          Adrss=br.readLine();
          bw.write(Id+"::"+Name+"::"+Dept+"::"+Doj+"::"+Adrss+":END:");
          bw.flush();
          bw.newLine();
          bw.close();
     public static void main(String[] args) throws IOException {
          ReadWriteFile rwf=new ReadWriteFile();
          String TID = null;
          String TADRSS = null;
          String TDOJ = null;
          String TNAME = null;
          String TDEPT = null;
          rwf.ReadFile(TID,TNAME,TDEPT,TDOJ,TADRSS);
     public void ReadFile(String Id1,String Name1,String Dept1,String Doj1,String Adrss1) throws IOException{
          BufferedReader br = new BufferedReader(new FileReader("TraineeDetails.dat"));
          String s;
           while((s = br.readLine())!= null)
             // Create string tokenizer
                StringTokenizer st =new StringTokenizer(s, "::");
                  System.out.println("----------------------------------------------");
                  System.out.println("| Trainee Id: "+st.nextToken()             +"|");
                  System.out.println("| Trainee Name: "+st.nextToken()           +"|");
                  System.out.println("| Trainee Department:"+st.nextToken()      +"|");
                  System.out.println("| Date of Joining: "+st.nextToken()        +"|");
                  System.out.println("| Trainee Address: "+st.nextToken()        +"|\n");
                  System.out.println("----------------------------------------------");
           // Close file reader
           br.close();
}     and here is the data i have written
Trainee.dat*
111::jain::roads::2-2008::Blore:END:
123::tim::service::1-2000::delhi:END:
444::faru::civil::3-2200::sanapur:END:
555::niv::cse::10-2000::gnagar:END:
999::linda::mech::6-2001::tnagar:END:
258::yansi::geo::8-2002::rtnagar:END:
656::hari::garrage::3-1000::uttarahalli:END:
888::muni::hr::5-2009::ernakulam:END:
007::bond::spy::2-1972::america:END:
0123::landy::games::6-2003::hdp:END:
678::maddy::pumbing::4-1999::dispur:END:

Answer 1

kalanidhi2u wrote:
I want to randomly access the file
But i cannt access itmake it RandomAccessFile... RandomAccessFile
I edited it
but i cannt edit the file by using itBoth of these are contradictory.