Separate two processes on 1 txt: FileReader and FileWriter - filereader

Question

In my code at the first step I write the result of the matcher to the file test1.txt. At the second step I read the content of test1.txt and use a part of speech tagger on it. My problem is that writing and reading to test1.txt works at the same time and that causes double entries in output.txt. How can I do it another way in order that reading from test1.txt begins only when writing to it ends and not at the same time?
while (matcher.find()) {
//create a new file and write to it during the search
try{
pWriter = new PrintWriter(new BufferedWriter(new FileWriter("E:/test/test1.txt", true)));//append any given input
pWriter.println(matcher.group()); //write the result of matcher to the new file
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
if (pWriter != null){
pWriter.flush();
pWriter.close();
}
}
System.out.println(matcher.group()); //Print the result of matcher to console
MaxentTagger tagger = new MaxentTagger("models/english-bidirectional-distsim.tagger");
FileInputStream fstream = new FileInputStream("E:/test/test1.txt");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
//pick up sentences line by line from the file test1.txt and store it in the string sample
while((sample = br.readLine())!=null)
{
//tag the string
String tagged = tagger.tagString(sample);
FileWriter q = new FileWriter("E:/test/output.txt",true);
BufferedWriter out =new BufferedWriter(q);
//write it to the file output.txt
out.write(tagged);
out.newLine();
out.close();
}
}

Answer 1

while (matcher.find()) {
//create a new file and write to it during the search
try{
pWriter = new PrintWriter(new BufferedWriter(new FileWriter("E:/test/test1.txt", true)));//append any given input
pWriter.println(matcher.group()); //write the result of matcher to the new file
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
if (pWriter != null){
pWriter.flush();
pWriter.close();
runReader();
}
}
private void runReader(){
MaxentTagger tagger = new MaxentTagger("models/english-bidirectional-distsim.tagger");
FileInputStream fstream = new FileInputStream("E:/test/test1.txt");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
//pick up sentences line by line from the file test1.txt and store it in the string sample
while((sample = br.readLine())!=null)
{
//tag the string
String tagged = tagger.tagString(sample);
FileWriter q = new FileWriter("E:/test/output.txt",true);
BufferedWriter out =new BufferedWriter(q);
//write it to the file output.txt
out.write(tagged);
out.newLine();
out.close();
}
}
}
This is one of the options, you need to call the function with the reader after the writer is closed.
A much better way is to use a single Thread for reader and writer each
Here is an example how to synchronize two Threads: synchronize two threads in java