1. Arrays & Refs
imperative / Java
Representation
Collected by Colleen Lewis — Own practice
Introduces references as arrows (i.e., something more standard)
| PL | NM |
|---|---|
| ... | (all aspects of Physical Java 3) |
| reference | arrow originating from a small box |
| null | X written in a small box |
Standard ways of drawing Java memory (X for null, arrows for references).
Once students understand the idea of a reference and aliasing.
There are no longer physical elements. Everything is written, which makes it easier.
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A notional machine is a pedagogic device to assist the understanding of some aspect of programs or programming.
