Help with deleting multiple strings from file.......

Question

I am trying to delete the same string that may appear multiple times in the file. Here is the output to the screen. Here is the code. I have been researching the delete method it says that I have to start at an index position in the string but how would I find out where the multiples strings reside in the file? I am getting the feeling that it won't work for my purpose..???? I am trying to delete all ot the strings "a string of data3" from the file.
Output
C:\TestRead>java StringDelete
Temp String file_data-------- a string of data3a string of data2a string of data
1a string of data3a string of data2a string of data1a string of data3
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data3
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data2
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data1
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data3
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data2
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data1
Just A Blank Line
Just A Blank Line
Just A Blank Line
String toDelete-------- a string of data3
Just A Blank Line
Just A Blank Line
Just A Blank Line
Code:
import java.io.*;
public class StringDelete
public static void main(String [] args)
try
FileInputStream fis = new FileInputStream("TestFile.txt");
DataInputStream in = new DataInputStream(fis);
StringBuffer file_data = new StringBuffer();
while(in.available() > 0)
String temp = in.readUTF(); // read in a string from the file
file_data.append(temp); // append it to the buffer
System.out.println("Temp String file_data-------- " + file_data);
System.out.println("Just A Blank Line");
System.out.println("Just A Blank Line");
System.out.println("Just A Blank Line");
boolean keepGoing = true;
while(keepGoing)
String toDelete = file_data.substring(0, "a string of data3".length());
System.out.println("String toDelete-------- " + toDelete);
System.out.println("Just A Blank Line");
System.out.println("Just A Blank Line");
System.out.println("Just A Blank Line");
if(toDelete == null || toDelete.equals("") )
keepGoing = false;
else
file_data.delete(0,"a string of data3".length());
catch(IOException e)
e.printStackTrace();

Answer 1

Here is the output. I am trying to get each part to work before I go on to the next part that is why some code is commented out.
I need help to know why string "a string of data3" is not deleted in the towrite string??
Output:
C:\TestRead>java NewStringDelete
String v after remove [ ◄a string of data3 ◄a string of data2 ◄a string of data1
◄a string of data3 ◄a string of data2 ◄a string of data1 ◄a string of data3]
String towrite after remove ◄a string of data3 ◄a string of data2 ◄a string of
data1 ◄a string of data3 ◄a string of data2 ◄a string of data1 ◄a string of data
3
Code:
import java.util.Vector;
import java.io.*;
public class NewStringDelete
     public static void main(String [] args)
          //String ls = System.getProperty("line.separator");
          //File file;
          Vector v=new Vector();
     try{
          BufferedReader br=new BufferedReader(new FileReader ("TestFile.txt"));
          String s;
          while ((s=br.readLine())!=null)
               {v.addElement(new String(""+s));}
                    br.close();
     catch(IOException e)
               e.printStackTrace();
/*now you have a Vector containing String objects..*/
     String remove = ("a string of data3");
     String towrite="";
System.out.println("String v after remove " + v);     
     for (int i=0; i<v.size();i++)
          String ss = (String)v.elementAt(i);
          if (ss.equalsIgnoreCase(remove)){continue;}
          //     towrite=towrite+ss+ls;
               towrite=towrite+ss;
System.out.println("");               
System.out.println("");               
System.out.println("String towrite after remove " + towrite);                    
/*do filewrite*/
//try{
// FileWriter fw=new FileWriter(TestFile.txt);
// fw.write(towrite);
// fw.close();
// catch(IOException e)
//               e.printStackTrace();