Updating the contents of a file fails

Question

Hi,
I am trying to modify the contents of a file and then write the modifications back to the same file but I keep getting an empty file . What am I doing wrong here?
import java.io.*;
import java.lang.String;
public class UpdateFile{
public static void main( String args[]){
try{
BufferedReader in = new BufferedReader( new FileReader("SchedulerEvents.ini"));
BufferedWriter out = new BufferedWriter( new FileWriter("SchedulerEvents.ini"));
String str;
String newString = null;
while(( str = in.readLine()) != null){
               newString = str.replaceAll("20030605", "20030507");
               out.write( newString);
               System.out.println( newString);
in.close();
out.close();
} catch( IOException ioe){}

Answer 1

Your trying to read and write to the same file at once. Just read everything into a string and open the output stream later in the program. This should work (I think):
import java.io.*;
import java.lang.String;
public class UpdateFile{
public static void main( String args[]){
try{
BufferedReader in = new BufferedReader( new FileReader("SchedulerEvents.ini"));
String output = "";
String str;
String newString = null;
while(( str = in.readLine()) != null){
newString = str.replaceAll("20030605", "20030507");
output = output + newString;
System.out.println( newString);
in.close();
BufferedWriter out = new BufferedWriter( new FileWriter("SchedulerEvents.ini"));
out.write( output);
out.close();
} catch( IOException ioe){}
}