JAVA

append to file in java

File file = new File("append.txt");
FileWriter fr = new FileWriter(file, true); // parameter 'true' is for append mode
fr.write("data");
fr.close();

java append a string to file

try {
    Files.write(Paths.get("myfile.txt"), "the text".getBytes(), StandardOpenOption.APPEND);
}catch (IOException e) {
    //exception handling left as an exercise for the reader
}

java append to file

File file = new File("append.txt");
FileWriter fr = new FileWriter(file, true);
BufferedWriter br = new BufferedWriter(fr);
br.write("data");

br.close();
fr.close();