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    <p>As proposed in <a href="https://stackoverflow.com/a/822166/644766">the accepted answer</a> to <a href="https://stackoverflow.com/questions/822150/modify-a-txt-file-in-java">a similar question</a>:</p> <blockquote> <p>open a temporary file in writing mode at the same time, and for each line, read it, modify if necessary, then write into the temporary file. At the end, delete the original and rename the temporary file.</p> </blockquote> <p>Based on your implementation, something similar to:</p> <pre><code>import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; public class ReplaceFileContents { public static void main(String[] args) { new ReplaceFileContents().replace(); } public void replace() { String oldFileName = "try.dat"; String tmpFileName = "tmp_try.dat"; BufferedReader br = null; BufferedWriter bw = null; try { br = new BufferedReader(new FileReader(oldFileName)); bw = new BufferedWriter(new FileWriter(tmpFileName)); String line; while ((line = br.readLine()) != null) { if (line.contains("1313131")) line = line.replace("1313131", ""+System.currentTimeMillis()); bw.write(line+"\n"); } } catch (Exception e) { return; } finally { try { if(br != null) br.close(); } catch (IOException e) { // } try { if(bw != null) bw.close(); } catch (IOException e) { // } } // Once everything is complete, delete old file.. File oldFile = new File(oldFileName); oldFile.delete(); // And rename tmp file's name to old file name File newFile = new File(tmpFileName); newFile.renameTo(oldFile); } } </code></pre>
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    1. COno idea how this worked for you?! since for me it doesn't even create a file. To fix I create a new FileWriter parsing in a File instance rather than a file name string like this code does. So obviously move `File newFile = new File(tmpFileName)` before creating the FileWriter and use that File instance for the FileWriter. fixed it for me.
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