Java Inheritance and Overriding

Align Technology's treatment-planning software builds each clear-aligner treatment plan out of a chain of TreatmentStep objects, where a specialized step like an AlignerAdjustment can override how it logs itself. A QA engineer is reviewing the class below during a code walkthrough.

public class TreatmentStep {
    protected int stepNumber;

    public TreatmentStep() {
        stepNumber = 1;
        logStep();
    }

    public void logStep() {
        System.out.println("Base step: " + stepNumber);
    }

    public static void main(String[] args) {
        TreatmentStep step = new AlignerAdjustment();
        step.logStep();
    }
}

class AlignerAdjustment extends TreatmentStep {
    private int adjustmentLevel = 5;

    @Override
    public void logStep() {
        System.out.println("Adjustment level: " + adjustmentLevel);
    }
}

What is printed when main runs, in order, and why? Walk through the construction and method-dispatch sequence line by line to justify your answer.