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01:52
Manik P.
Which statement about abstract classes and interfaces is false? (A) An interface cannot implement any non-default instance methods, whereas an abstract class can. (B) A class can implement many interfaces but can have only one superclass. (C) An unlimited number of unrelated classes can implement the same interface. (D) It is not possible to construct either an abstract class object or an interface object. (E) All of the methods in both an abstract class and an interface are public.
01:01
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
01:33
Khoobchandra A.
What is the wavelength of a photon that has three times as much energy as that of a photon whose wavelength is 820 nm?
01:40
Which is a correct implementation of the CheckingAccount constructor? I super(acctBalance); II super(); deposit (acctBalance); III deposit(acctBalance); (A) I only (B) II only (C) III only (D) II and III only (E) I, II, and III
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