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AP Computer Science a Flashcards: Constructors

Study Constructors in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

When is the default constructor provided?

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ANSWER

When no other constructors are defined. Java removes default constructor once any constructor is explicitly created.

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AP Computer Science a: Class Creation

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What this deck covers

This deck focuses on Constructors, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 19Practice questions for this set
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
    }
}
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