How to open the file writer for next entry after stream is close?

Question

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class TryOut {
     public static void main(String args[]) throws IOException{
          int inputQuestionnAireNum = 0;
          int inputPostCode = 0;
          int inputGender = 0;
          int inputAge = 0;
          int x=0;
          Scanner input = new Scanner(System.in);
          FileWriter fwrite = new FileWriter("tryout.txt", true);
          BufferedWriter out = new BufferedWriter(fwrite);
          boolean invalidNum = false;           
          do{
               System.out.print("1 new entry or 0 print");
               x = Integer.parseInt(input.nextLine());  
               if(x == 1)
                  //Questionnaire Number
                    System.out.print("Enter Questionnaire Number [ ] ");
                    inputQuestionnAireNum = Integer.parseInt(input.nextLine());
                    out.write("NumBER OF Q: "+inputQuestionnAireNum+", ");
                    //Postal code
                    System.out.print("Enter Postal Code [ ] ");     
                    inputPostCode = Integer.parseInt(input.nextLine());
                    out.write("PostCode: "+inputPostCode+", ");
                    //Age
                    System.out.print("Enter Age [ ] ");
                    inputAge = Integer.parseInt(input.nextLine());
                    out.write("Age: "+inputAge+", ");
                    //Gender
                    System.out.print("Enter Gender '1' for Male and '2' for for female [ ] ");
                    inputGender = Integer.parseInt(input.nextLine());
                    out.write("Gender: "+inputGender+", \n");
                    out.close();          
                       } while(x != 0);
     Result:
1 new entry or 0 print1
Enter Questionnaire Number [ ] 2
Enter Postal Code [ ] 1
Enter Age [ ] 3
Enter Gender '1' for Male and '2' for for female [ ] 4
1 new entry or 0 print1
Enter Questionnaire Number [ ] 2
Exception in thread "main" java.io.IOException: Stream closed
     at java.io.BufferedWriter.ensureOpen(BufferedWriter.java:98)
     at java.io.BufferedWriter.write(BufferedWriter.java:203)
     at java.io.Writer.write(Writer.java:126)
     at TryOut.main(TryOut.java:31)
Hi, how can i open the file writer stream again for next entry after it is has been closed? if i do not close(); all my entry will not be recorded to the text file. how can i solve this ?
Edited by: metaroot on Feb 18, 2008 6:39 PM

Answer 1

The short answer to your question: use out=new BufferedWriter(fwrite) inside the do loop as well.The only difference that would make would be to make the problem worse. It is poor practice. Stream stacks should be constructed once for the life of the stream.
What he needs to do is close his stream outside the loop, possibly calling flush() where he presently has close().
The more relevant answer is: Why are you not wrapping the user-friendly PrintWriter class, wrapping it around the BufferedWriter?Possibly because he doesn't like the fact that PrintWriter swallows exceptions? which makes it less user-friendly IMO.
The println and print methods are very useful, and do not need closing between loop iterations.Neither does anything else.
By the way,you say that without a close() the BufferedWriter doesn't output to the file.I don't know: I never used/tried it.Even if it doesn't, it will surely output after you come out of the loop.If you don't want to use a PrintWriter, why don't you investigate this?Posting guesses here isn' t really much help, especially about something you've never used. A BufferedWriter has a buffer and it doesn't write anything until the buffer is full, you flush it, or your close it.