Constructors Practice Test

In the Student code below, what value will the field id have after executing new Student("Maya")?

public class Student {

    private String name;

    private int id;

    // Public constructor: sets both name and id

    public Student(String name, int id) {

        this.name = name;

        this.id = id;

    }

    // Public constructor: sets name and defaults id to 0

    public Student(String name) {

        this(name, 0); // Chain to the two-parameter constructor

    }

    // Private constructor: internal helper for an unnamed student

    private Student(int id) {

        this("Unknown", id); // Chain to the two-parameter constructor

    }

}

In the Car code below, which constructor will be invoked when creating a new instance with no arguments?

public class Car {

    private String make;

    private String model;

    private int year;

    // Public default constructor: sets year to the current year

    public Car() {

        this("Unknown", "Unknown", 2026); // Chain to parameterized constructor

    }

    // Public parameterized constructor: initializes all fields

    public Car(String make, String model, int year) {

        this.make = make;

        this.model = model;

        this.year = year;

    }

    // Private constructor: internal helper for creating a placeholder car

    private Car(String make, String model) {

        this(make, model, 2026); // Chain to parameterized constructor

    }

}