DogWalker free response answer 2025

DogWalker is #1 from the from the 2025 AP Computer Science A Free Response problems.

https://apcentral.collegeboard.org/media/pdf/ap25-frq-computer-science-a.pdf

Part (a) walkDogs method

public int walkDogs(int hour)
{
    int dogsToWalk = Math.min(maxDogs, company.numAvailableDogs(hour));
    company.updateDogs(hour, dogsToWalk);
    return dogsToWalk;
}

Part (b) dogWalkShift method

public int dogWalkShift(int startHour, int endHour)
{
    int earnings = 0;

    for(int hour = startHour; hour <= endHour; hour++)
    {
        int dogsWalked = walkDogs(hour);
        earnings += dogsWalked * 5;

        if((hour >= 9 && hour <= 17) || dogsWalked == maxDogs)
            earnings += 3;
    }

    return earnings;
}

Java files with test code

DogWalkCompany.java
DogWalker.java
OneTest.java

See Running JUnit 5 tests.

2025 AP CS Exam Free Response Solutions

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