Java FileWriter with append mode

java filewriter
Progress Programmer picture Progress Programmer · Aug 4, 2009 · Viewed 84.1k times · Source

I'm currently using FileWriter to create and write to a file. Is there any way that I can write to the same file every time without deleting the contents in there?

   fout = new FileWriter(
    "Distribution_" + Double.toString(_lowerBound) + "_" + Double.toString(_highBound) + ".txt");
    fileout = new PrintWriter(fout,true);
fileout.print(now.getTime().toString() + ", " + weight + ","+ count +"\n");
    fileout.close();

Answer

Amber picture Amber · Aug 4, 2009

Pass true as a second argument to FileWriter to turn on "append" mode.

fout = new FileWriter("filename.txt", true);

FileWriter usage reference

Related questions

Create whole path automatically when writing to a new file

I want to write a new file with the FileWriter. I use it like this: FileWriter newJsp = new FileWriter("C:\\user\Desktop\dir1\dir2\filename.txt"); Now dir1 and dir2 currently don't exist. I want Java to create them automatically …

Read More
Create a new line in Java's FileWriter

I have coded the following FileWriter: try { FileWriter writer = new FileWriter(new File("file.txt"), false); String sizeX = jTextField1.getText(); String sizeY = jTextField2.getText(); writer.write(sizeX); writer.write(sizeY); writer.flush(); writer.close(); } catch (IOException ex) {} Now I want …

Read More
Overwriting txt file in java

The code I've written is supposed to overwrite over the contents of the selected text file, but it's appending it. What am I doing wrong exactly? File fnew=new File("../playlist/"+existingPlaylist.getText()+".txt"); String source = textArea.getText(); System.out.…

Read More