How can I use processing in "java mode"? I need to make an array with dynamically changing length and contents. Looking through these discourses I think what I need is the java vector class, but i can find no way of switching between programming modes. Is it the same thing as using "import library - javascript"? But then I can see no way of switching between basic and continuous modes either ( I seem to be in continuous mode at the moment) so I think I must be missing something.

that's already imported by default. you can just use Vector:

Code:

Vector v;

void setup() {
  v = new Vector();
  for (int i = 0; i < 10; i++) {
    v.add(something);
  }
}