Close your PrintWriter in a finally block to flush it and to reclaim resources public void writeToFile(String fileName) { // **** Note that pW must be declared before the try block PrintWriter pW = null; try { pW = new PrintWriter(new File(fileName)); for (int x = 0; x < 25; x++) { for (int y … Read more
According to coderanch.com, if we combine the answers we get: FileWriter is the character representation of IO. That means it can be used to write characters. Internally FileWriter would use the default character set of the underlying OS and convert the characters to bytes and write it to the disk. PrintWriter & FileWriter. Similarities Both … Read more
This might sound flippant, but PrintStream prints to an OutputStream, and PrintWriter prints to a Writer. Ok, I doubt I’ll get any points for stating the obvious. But there’s more. So, what is the difference between an OutputStream and a Writer? Both are streams, with the primary difference being a OutputStream is a stream of … Read more
As others have pointed out, you might be better off using a temporary file, if there’s a slightest risk that your program crashes mid way: public static void removeNthLine(String f, int toRemove) throws IOException { File tmp = File.createTempFile(“tmp”, “”); BufferedReader br = new BufferedReader(new FileReader(f)); BufferedWriter bw = new BufferedWriter(new FileWriter(tmp)); for (int i … Read more
If the directory doesn’t exist you need to create it. Java won’t create it by itself since the File class is just a link to an entity that can also not exist at all. As you stated the error is that the file cannot be created. If you read the documentation of PrintWriter constructor you … Read more
The fact that PrintWriter‘s method is called append() doesn’t mean that it changes mode of the file being opened. You need to open file in append mode as well: PrintWriter pw = new PrintWriter(new FileOutputStream( new File(“persons.txt”), true /* append = true */)); Also note that file will be written in system default encoding. It’s … Read more