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) ; Which method call will cause an error? (A) b.deposit(200) ; (B) s.withdraw(500); (C) c.withdraw(500); (D) s. deposit(10000) ; (E) s.addInterest() ;

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) ;
Which method call will cause an error?
(A) b.deposit(200) ;
(B) s.withdraw(500);
(C) c.withdraw(500);
(D) s. deposit(10000) ;
(E) s.addInterest() ;

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Key Concepts

Polymorphism

Polymorphism is an object-oriented programming concept where a single variable of a superclass type can reference objects of different subclasses, allowing for flexible code that can work with objects of various specific types. The actual method that is executed is determined at runtime based on the object's type, provided the method is defined in the superclass.

Upcasting

Upcasting occurs when an object of a subclass is assigned to a variable of its superclass type. This allows the variable to reference subclass objects, but it limits method calls to only those methods declared in the superclass. Subclass-specific methods are not directly accessible through the superclass reference.

Compile-Time Type Checking

Compile-time type checking ensures that the methods being called on an object are part of its declared type. If a method is not available in the declared type (even if it exists in the actual object’s subclass), the compiler will generate an error. This mechanism helps catch errors before the code is executed.

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