Authoring skeleton - not a student assignment

Three short topics

Text and binary import/export layers.
Fixed-size records and RandomAccessFile offsets.
Exception handling, resource closure, and recovery.

PBL context

Observe AssignmentQueueConverter’s JSON round trip and error handling. Build a separate local record-storage lab; JSON/database storage does not itself demonstrate binary or random-access file competence.

Implementation layers to author

Adapt the existing text-file lesson to an export/import task.
Define a binary record format and demonstrate a round trip.
Update one fixed-size record by offset without rewriting the whole file.

Evidence checklist to author

Test empty files, malformed text, truncated binary records, invalid record indices, and preserved neighboring records. Specify an appropriate execution environment if the browser runner cannot persist files across runs.

Publication checklist

Complete exercises and checks before assigning courses.csa.week, removing draft/hide flags, or enabling submissions.

Code Runner Challenge

Authoring draft - file persistence exercise is not ready

View IPYNB Source

// CODE_RUNNER: Authoring draft - file persistence exercise is not ready
public class PersistenceDraft {
    public static void main(String[] args) {
        throw new UnsupportedOperationException("Draft: author the file format, exercise, and tests before publication.");
    }
}
PersistenceDraft.main(null);

Lines: 1 Characters: 0

Output

Click "Run" in code control panel to see output ...