Write lines of text to file using a PrintWriter : PrintWriter « File « Java Tutorial

import java.io.FileWriter;
import java.io.PrintWriter;

public class Main {
  public static void main(String[] args) throws Exception {
    String filename = "fileName.txt";
    String[] linesToWrite = new String[] { "a", "b" };
    boolean appendToFile = true;

    PrintWriter pw = null;
    if (appendToFile) {
      pw = new PrintWriter(new FileWriter(filename, true));
    } else {
      pw = new PrintWriter(new FileWriter(filename));
      // pw = new PrintWriter(new FileWriter(filename, false));
    for (int i = 0; i < linesToWrite.length; i++) {

11.34.2.PrintWriter is more convenient to work with than OutputStreamWriter
11.34.3.Write lines of text to file using a PrintWriter
11.34.4.Using PrintWriter
11.34.5.A PrintWriter that ends lines with a carriage return-line feed (CRLF).
11.34.6.A PrintWriter that also sends its output to a log stream
11.34.7.Turn System.out into a PrintWriter.