ZombiePlant free response

Classes & objects are always tested in the multiple choice and free response sections.

This question uses the table format that has been featured recently on AP CS Free Response that require writing a class. The table in this problem is too long for an actual AP CS Free Response, so please don’t use it to practice timing. Use only actual released AP CS FR for timing practice. The approach is identical to a real AP CS FR.

Problem description

This question involves the implementation of a zombie plant treatment system that is represented by the ZombiePlant class. A ZombiePlant object is created with parameters that specify the maximum potency for a successful treatment and the initial number of successful treatments required to cure the plant.

The ZombiePlant class provides a constructor and the following methods.

The following table contains a sample code execution sequence and the corresponding results.

Statements and Expressions Value Returned (blank if no value) Comment 
ZombiePlant plant =
    new ZombiePlant(10, 3);
The plant requires treatments with a potency <= 10. The plant initially needs 3 successful treatments to be cured.
plant.treatmentsNeeded(); 3 The plant has not yet been treated, so it still needs 3 treatments to be cured.
plant.isDangerous(); true The plant still needs at least 1 treatment to be cured, so it is dangerous.
plant.treat(7); The treatment potency is <= 10, so the treatment is successful.
plant.treatmentsNeeded(); 2 The plant now needs 2 successful treatments to be cured.
plant.treat(11); The treatment potency is not <= 10, so the treatment is not successful.
plant.treatmentsNeeded(); 3 The failed treatment increased the number of successful treatments needed for the plant to be cured by 1.
plant.treat(10); The treatment potency is <= 10, so the treatment is successful.
plant.treatmentsNeeded(); 2 The plant now needs 2 successful treatments to be cured.
plant.isDangerous(); true The plant still needs at least 1 treatment to be cured, so it is dangerous.
plant.treat(8); The treatment potency is <= 10, so the treatment is successful.
plant.treat(4); The treatment potency is <= 10, so the treatment is successful.
plant.treatmentsNeeded(); 0 The successful treatments reduced the number of treatments needed to 0.
plant.isDangerous(); false The plant has been cured. It is no longer dangerous.
plant.treat(4); Additional treatments with a potency <= 10 have no effect.
plant.treatmentsNeeded(); 0 The additional treatment with a potency <= 10 had no effect.
plant.isDangerous(); false The plant remains cured.
plant.treat(11); The additional treatment potency is not <= 10, so the treatment causes the plant to become dangerous again.
plant.treatmentsNeeded(); 1 The failed treatment increased the number of successful treatments needed for the plant to be cured by 1.
plant.isDangerous(); true The plant is now dangerous again.
plant.treat(12); The treatment potency is not <= 10, so the treatment is not successful.
plant.treatmentsNeeded(); 2 The failed treatment increased the number of successful treatments needed by 1.
plant.isDangerous(); true The plant is still dangerous.

Write the complete ZombiePlant class, including the constructor and any required instance variables and methods. Your implementation must meet all specifications and conform to the example.

Solution & comments

See the ZombiePlant solution or review it with AP CS Tutor Brandon Horn.

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