autoreload.pde

import java.io.File;
long lastTime = 0;
File f;
String[] data; 
void setup() {
  f = new File("e:/test.txt");
}

void draw() {
  background(0);
  check();
  for (int i = 0; i < data.length; i++) {
    text(data[i], 10, 20 +(i*20));
  }
}

void check() {
  long millisec = f.lastModified();
  if (millisec > lastTime) {
    reload();
    lastTime = millisec;
  }
}

void reload() {
  data = loadStrings(f.getAbsolutePath());
}