Class Name



Allows characters to print to a text-output stream. A new PrintWriter object is created with the createWriter() function. For the file to be made correctly, it should be flushed and must be closed with its flush() and close() methods (see above example).


  • PrintWriter output;
    void setup() {
      // Create a new file in the sketch directory
      output = createWriter("positions.txt"); 
    void draw() {
      point(mouseX, mouseY);
      output.println(mouseX);  // Write the coordinate to the file
    void keyPressed() {
      output.flush();  // Writes the remaining data to the file
      output.close();  // Finishes the file
      exit();  // Stops the program