Bottle free response answer 2026

Bottle is #2 from the from the 2026 AP Computer Science A Free Response problems.

https://apcentral.collegeboard.org/media/pdf/ap26-frq-computer-science-a.pdf

Bottle class

public class Bottle
{
    private final double capacity;
    private double amountRemaining;

    public Bottle(double capacity)
    {
        this.capacity = capacity;
        amountRemaining = capacity;
    }

    public double updateAmount(double amountUsed)
    {
        final double MIN_PERCENT_LEFT = 0.25;

        amountRemaining -= amountUsed;

        if(amountRemaining < capacity * MIN_PERCENT_LEFT)
            amountRemaining = capacity;

        return amountRemaining;
    }
}

See Class writing order for details on how to approach free response that request writing an entire class.

Java files with test code

Bottle.java
TwoTest.java

See Running JUnit 5 tests.

2026 AP CS Exam Free Response Solutions

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