Use the following for Questions A program to test the...

Use the following for Questions A program to test the BankAccount, SavingsAccount, and CheckingAccount classes has these declarations: BankAccount $\mathrm{b}=$ new BankAccount (1400) ; BankAccount $s=$ new SavingsAccount (1000,0.04) ; BankAccount $c=$ new CheckingAccount (500) ; In order to test polymorphism, which method must be used in the program? (A) Either a SavingsAccount constructor or a CheckingAccount constructor (B) addInterest (C) deposit (D) withdraw (E) getBalance

Use the following for Questions
A program to test the BankAccount, SavingsAccount, and CheckingAccount classes has these declarations:
BankAccount $\mathrm{b}=$ new BankAccount (1400) ;
BankAccount $s=$ new SavingsAccount (1000,0.04) ;
BankAccount $c=$ new CheckingAccount (500) ;
In order to test polymorphism, which method must be used in the program?
(A) Either a SavingsAccount constructor or a CheckingAccount constructor
(B) addInterest
(C) deposit
(D) withdraw
(E) getBalance

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Key Concepts

Polymorphism

Polymorphism refers to the ability of different object types to be accessed through the same interface, typically a superclass reference, while functioning differently based on their actual class types. This allows methods to be overridden in subclasses so that when the method is called on a superclass reference, the subclass’s version of the method is executed.

Method Overriding

Method overriding occurs when a subclass provides its own implementation of a method that is already defined in its superclass. This is key to achieving polymorphism because it allows each subclass to tailor behavior to its own context while maintaining a consistent interface defined by the superclass.

Dynamic Method Dispatch

Dynamic method dispatch, also known as runtime polymorphism, is the mechanism by which a call to an overridden method is resolved at runtime rather than compile time. This ensures that the subclass implementation of a method is called even when the method is invoked through a superclass reference.

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