NII Interpretations

Desired code inside a thing that writes scripts:
Script writeIt()
{
  Format boxFormat = new Format(...);
  LabelBox box1 = new LabelBox("Box 1", new Point(400d,400d), boxFormat);
  LabelBox box2 = new LabelBox("Box 2", new Point(600d,600d), boxFormat);
  Arrow arrow = new Arrow(box1,false,box2,true,boxFormat):
  
  // here's the script proper
  cue(3); // wait until the clock says it's 3.
  sketch(500d, box1); // sketch the box in a half-second
  sketch(500d, box2);
  sketch(2000d, arrow); // slowly draw the arrow
  swipe(0); // move & scale everything to fit in position 0 (lower right corner);
}

old-school:
  just derive every writer of scripts from class ScriptWriter which has all those cue/sketch/etc methods, and use them.

with NII meaning 'never override a method'
  same as old-school
  
with NII meaning 'never use extends'
1) define a helper, embed it in the person who writes scripts, prepend every line with "helper."
2) define helper with all statics, use import static ...Helper.*;

It looks like you want the semicolon operator in Smalltalk. The closest you have in Java is

Script myScript = new Script() {{
  cue(3); // wait until the clock says it's 3.
  sketch(500d, box1); // sketch the box in a half-second
  sketch(500d, box2);
  sketch(2000d, arrow); // slowly draw the arrow
  swipe(0); // move & scale everything to fit in position 0 (lower right corner);
}};
myScript.run(canvas); // I'm just guessing here. canvas might just be this.

Yes, this uses extends (at least in the background), but it doesn't override a concrete method and it elides the implicit receiver primitiveOperationsLibrary. It's a cheat, but I'd consider it here. It extends Script in such a way that avoids the risk of breaking a contract, since using Script this way has no contract, except for run() which runs the script.