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Exam 3: Using Methods Classes and Objects

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Question 1

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When an application is run, the method that must be executed first must be named ____.

A) first()
B) void()
C) main()
D) final()

E) B) and C)
F) A) and D)

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Question 2

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Often, programmers list the ____________________ first because it is the first method used when an object is created.

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constructor

Question 3

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Any class can contain an unlimited number of methods.

public int getStudentNum() { return studentNum; } In the above code, identify if the method is a mutator method or an accessor method. Describe how the two types of methods differ and how they are similar.

Normally, you declare constructors to be ____________________ so that other classes can instantiate objects that belong to the class.

How do you use a value returned from a method? Provide an example.

The name of the ____ is always the same as the name of the class whose objects it constructs.

Does a programmer need to write every class he or she uses? Why or why not?

Public classes are accessible by all objects, which means that public classes can be ____, or used as a basis for any other class.

In order to allocate the needed memory for an object, you must use the ____ operator.

Data items you use in a call to a method are called ____.

Parentheses in a method declaration contain parameters that are "dropped into" the method.

How does the order in which methods appear in a class affect how the application executes? Please explain.

In the above code, the calculateBonus() method acts as a "black box." What does this mean?

After an object has been instantiated, its methods can be accessed using the object's _____, a dot, and a method call.

public static void predictRaise(double salary) { double newSalary; final double RAISE_RATE = 1.10; newSalary = salary * RAISE_RATE; System.out.println("Current salary: " + salary + " After raise: " + newSalary); } In the above code, what are the parameter data type and parameter identifier? How do you identify each?

public Employee() { empSalary = 300.00; } The above code shows the Employee class constructor. What is a constructor and how would this default constructor operate?

What is a method and how is one used?

A major advantage of a method is that it is easily reusable. What does it mean to reuse a method and what are the advantages of doing so?

Describe fully qualified identifiers and explain why they are necessary.