Java Programming Concepts and OOP Principles

What modification would you have to make to this code for it to compile?

If the Point class doesn't override the equals method in the Object class, what will the following code do? Point pointOne = new Point(3, 4); int x = 3; int y = 4; Point pointTwo = new Point(x, y); System.out.println(pointOne.equals(pointTwo));

If the Professor class extends the Teacher class, which of the following if statements will compile? Professor professor = new Professor(); Teacher teacher = new Teacher();

What keyword do you use in a class declaration to create a subclass?

Which of the following statements is true?

What does the following code display? public class GradeCurveApp { public static void main(String[] args) { int grade = 95; GradeCurve curve = new GradeCurve(); curve.lowerGrade(grade); System.out.println(grade); } } public class GradeCurve { public void lowerGrade(int g) { g -= 5; } }

To include a class in a package, you

If the AbstractButton class is abstract and the JButton class inherits it, which of the following data from the AbstractButton class must be defined in the JButton class?

If the MotorVehicle class contains a protected method named getEngineType, what other class or classes can access this method?

What other constructor is also called when the following constructor is invoked: public Sailboat(String id, double length, int sails) { super(id, "sailboat", length); this.sails = sails; }

The attributes of an object are often coded as?

What happens if the user enters 'K' at the console prompt in the provided code example?

Which of the following classes should not inherit a class that defines an employee?

Which of the following is not a reason to declare a class as final?

In what type of file is javadoc documentation stored?

You can use NetBeans to generate the Java documentation for?

If the instance variables of the Employee class are declared as follows, which statement is most likely to be in the constructor? private String name; private Address address; private long employeeNumber;

When a subclass inherits an abstract class, it must override all of the abstract methods in the abstract class.

What happens when the following code is executed? Rental rental = new JetSkiRental(); rental.setTotal();

An enumeration inherits methods from which of the following classes?

The method printDeposit is a static method.

In which of the following situations would it make the most sense to code a static method rather than a regular method in a class that defines a bank account?

Which of the following is not an advantage of using a three-tiered architecture for your applications?

What class or classes is a method that is declared protected available to?

If the user enters 'C' at the console prompt, which class contains the setTotal method that is called?

To use NetBeans to create a new class, you can right-click on the package for the class and select?

What happens when these statements are compiled? Loan loan = new Loan(amount, months); Object obj = loan; obj.calculatePayments();

Assume that all three classes in this inheritance hierarchy contain a calculateMaxSpeed method. Which class defines the method that is called when the statement is executed? MotorVehicle car = new Automobile(); car.calculateMaxSpeed();

Generated Java documentation includes the code that implements each documented method.

When you call the equals method in the String class without knowing how it's coded, you're taking advantage of what object-oriented concept?

Which of the following can you not code in a subclass?

Which of the following can you not do with an enumeration?

Which of the following is an advantage of coding two or more classes in the same file?

Which method is an example of overloading the method that follows public int parseNumber(String numberString){...}?

To determine an object's type, you can use?

Which of the following methods can always be called from a Product object?

What is the name of the class that contains the following code? private Clock clock; private Alarm alarm; public AlarmClock(Date time){...}

If name is a String instance variable, average is a double instance variable, and numOfStudents is a static int variable, why won't the following code compile? public Student(String s) { name = s; average = getAverage(name); numOfStudents++; } public double getAverage(String x) { numOfStudents++; double ave = StudentDB.getAverage(x); return ave; } public static void setAverage(double g) { average = g; }

You must use the this keyword?

If a method accepts an Object object, what other types of objects can it accept?

In the directory structure provided, what is the name of the package that contains the Invoice.java class?

Which of the following is a valid javadoc comment?

A class in the Java API can be?

How many public classes can exist in a file?

If the constructor that follows is in the Employee class, what other constructor, if any, is implicitly provided? public Employee(String name, int salary){...}

What happens when the statement Automobile car = new Automobile(1); is executed?

If the Loan class contains a final method named calculatePayment, what does the following code do? HomeLoan loan = new HomeLoan(amount, months); loan.calculatePayment();

Where must you code the javadoc comment for a method?

What is the difference between these two constructors? public Transaction(){...} public Transaction(int x, int y){...}

What feature allows you to treat an Admin object as though it were an Account object in this inheritance hierarchy?

It can access instance variables and methods of the outer class.

Which of the following is NOT a reason to create a package?

A subclass inherits?

Which of the following is a benefit of using javadoc comments?

Which of the following is NOT true about static imports?

Which of the following method declarations overrides this method? double calculateMilesPerGallon(double speed){...}

Which of the following statements creates an object of the Account class? Account account = new Account(111, "Checking", 0.0);

The values held by the attributes of an object describe the object's?

You can use the final keyword for?

What will the following code do? public class Person { private String name; public Person(String n) { name = n; } public String getName() { return name; } public boolean equals(Object obj) { if (obj instanceof Person) { Person person2 = (Person)obj; if (name.equals(person2.getName())) return true; } return false; } public static void main(String[] args) { String name = "Alex Thomas"; Customer custOne = new Customer(name, "123456"); Customer custTwo = new Customer(name, "333"); System.out.println(custOne.equals(custTwo)); } } public class Customer extends Person { String number; public Customer(String name, String num) { super(name); number = num; } }

When using NetBeans, what must you do to use a class that's stored in a custom library?

A static initialization block?

Assume that only the AbstractButton class contains a setText method. Which class defines the method that is called when the statement is executed? JButton button = new JButton(); button.setText("Exit");

What does the following code display? public class RentalApp { public static void main(String[] args) { Rental r = new Rental(); r.setNumOfPersons(5); r.addPerson(r); System.out.println(r.getNumOfPersons()); } } public class Rental { private int numOfPersons; public int getNumOfPersons() { return numOfPersons; } public void setNumOfPersons(int numOfPersons) { this.numOfPersons = numOfPersons; } public void addPerson(Rental rental) { rental.numOfPersons++; } }

A method can operate directly on the data in a reference type that's passed to it and change that data.

Which of the following is NOT true about an inner class?

Explicit casting is always required to cast a superclass object to a subclass object.

What change do you have to make to the code that follows to get it to compile? public final class Trajectory { double velocity; void convertVelocityUnits() { velocity *= 1.2; } } public class FlightPath extends Trajectory { final Trajectory trajectory = new Trajectory(); final void computeFlightPath() { System.out.println("Computing Flight Path"); trajectory.velocity /= 1.2; } }

What class or classes is a variable available to if it is declared without an access modifier?

Each constant within an enumeration is assigned?

If the statement that follows is executed, which constructor will NOT be called? SavingsAccount account = new SavingsAccount();

Which of the following is true about a method that has this declaration? public Employee getDepartmentManager(){...}

To compare the instance variables of two objects, you can?

If the duesOwed instance variable in the code that follows is set in the setDuesOwed method, which of the following is NOT true about the setDuesOwed method? private String name; //instance variable private double duesOwed; //instance variable public Member(String s) { name = s; setDuesOwed(name); }