Constructors Practice Test

In the BankAccount code below, how does constructor chaining work in this example?

public class BankAccount {

    private String accountNumber;

    private double balance;

    // Public default constructor: creates an account with a default balance of 0.0

    public BankAccount() {

        this("000000", 0.0); // Chain to the parameterized constructor

    }

    // Public parameterized constructor: initializes both fields from arguments

    public BankAccount(String accountNumber, double balance) {

        this.accountNumber = accountNumber;

        this.balance = balance;

    }

    // Private constructor: internal helper for creating a "closed" account

    private BankAccount(String accountNumber) {

        this(accountNumber, 0.0); // Chain to the parameterized 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

    }

}