Writing Text Files

• To write to a file, construct a PrintWriter object

  PrintWriter out = new PrintWriter("output.txt");

• If file already exists, it is emptied before the new data are written into it
• If file doesn't exist, an empty file is created
• Use print and println to write into a PrintWriter:

  out.println(29.95);
  out.println(new Rectangle(5, 10, 15, 25));
  out.println("Hello, World!");

• You must close a file when you are done processing it:

  out.close();

  Otherwise, not all of the output may be written to the disk file