FRQ class design

FRQ Question 2 (Class Design) hands you a table like:

| Expression | Result | | --- | --- | | new Sensor(20) | a sensor starting at 20 | | s.read() | current value | | s.tick() | value grows by 1, nothing returned |

...and asks you to write the whole class. The checklist every answer needs:

1. public class Name { header.
2. private instance variables — every one the table implies.
3. A constructor matching the table's construction row.
4. The required methods, with exact names/signatures.

Worked answer for the table above:

public class Sensor {
    private int value;

    public Sensor(int start) {
        value = start;
    }

    public int read() {
        return value;
    }

    public void tick() {
        value++;
    }
}

Scoring rubric details: exact method names and parameter types are worth points; state changes must actually happen (value++ inside tick), and methods the table shows returning nothing are declared void.

Decomposition inside classes: a method may call another method of the same object directly — isLong() could call getPages() without a dot.