Exam 9: Inheritance and Interfaces

Consider the following class hierarchy: Public class Vehicle { Private String type; Public Vehicle(String type) { This.type = type; } Public String getType() { Return type; } } Public class LandVehicle extends Vehicle { Public LandVehicle(String type) { ) . . } } Public class Auto extends LandVehicle { Public Auto(String type) { ) . . } } Which of the following code fragments is NOT valid in Java?

A method that has no implementation is called a/an ____ method.

You are creating a Motorcycle class which is supposed to use an interface named Measurable. Which of the following class declaration statements will accomplish this?

Which of the following indicates that the Motorcycle class is a subclass of the Vehicle class?

Which of the following is true regarding subclasses?

A class from which you cannot create objects is called a/an ____.

You are creating a Motorcycle class which is supposed to inherit from the Vehicle class. Which of the following class declaration statements will accomplish this?

You are creating a Vessel class which is supposed to use an interface named Measurable. Which of the following class declaration statements will accomplish this?

With a few exceptions, instance variables of classes should always have ___ access.

Consider the following code snippet: Int numAxles = 4; String s = "Number of axles is " + numAxles; Which of the following statements is correct?

Consider the following code snippet: Public class BankAccount implements Comparable<BankAccount> { . . . Public int compareTo(T other) { What is wrong with this code?

Which of the following is true regarding subclasses?

Consider the following code snippet: Public class Score { Private String name; ) . . Public boolean equals(Object otherScore) { Return name.equals(otherScore.name); } ) . . } What is wrong with this code?

To ensure that an instance variable can only be accessed by the class that declared it, the variable should be declared as ____.

Consider the following code snippet: Public class Coin { ) . . Public boolean equals(Coin otherCoin) { ) . . } ) . . } What is wrong with this code?

When declared as protected, data in an object can be accessed by ____.

Consider the following code snippet: Public class Motorcycle extends Vehicle { Private String model; ) . . Public Motorcycle(int numberAxles, String modelName) { Model = modelName; Super(numberAxles); } } What does this code do?

Consider the following code snippet: Public interface Sizable { Double size; Double getSize(); } What is wrong with this code?

You are creating a Motorcycle class which is supposed to be a subclass of the Vehicle class. Which of the following class declaration statements will accomplish this?

Consider the following code snippet: Public void deposit(double amount) { TransactionCount ++; Super.deposit(amount); } Which of the following statements is true?