ICSI 201 – Chapter 6 Review Questions – Flashcards
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Class
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This is a collection of programming statements that specify the fields and methods that a particular type of object may have.
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Blueprint
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A class is analogous to a(n) ______.
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Instance of a class
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An object is a(n) ______.
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Field
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This is a class member that holds data.
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new
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This key word causes an object to be created in memory.
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Accessor
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This is a method that gets a value from a class's field, but does not change it.
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Mutator
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This is a method that stores a value in a field or in some other way changes the value of a field.
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Stale
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When the value of an item is dependent on other data, and that item is not updated when the other data is changed, what has the value become?
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Constructor
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This is a method that is automatically called when an instance of a class is created.
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Shadows
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When a local variable has the same name as a field, the local variable's name does this to the field's name.
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Default Constructor
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This is automatically provided for a class if you do not write one yourself.
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Their parameter lists
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Two or more methods in a class may have the same name, as long as this is different.
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Binding
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The process of matching a method call with the correct method is known as ______.
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Things the class knows and actions the class performs.
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A class's responsibilities are ______.
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True
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The "new" operator creates an instance of a class. (T/F)
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True
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Each instance of a class has its own set of instance fields. (T/F)
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False
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When you write a constructor for a class, it still has the default constructor that Java automatically provides. (T/F)
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False
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A class may not have more than one constructor. (T/F)
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False
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To find the classes needed for an object-oriented application, you identify all the verbs in a description of the problem domain. (T/F)
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A class is a blueprint or a representation of how an object has to be instantiated. The instance is the actual object created from the class at runtime.
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What is the difference between a class and an instance of a class?
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Classes are analogous to the blueprint of the houses.
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A contractor uses a blueprint to build a set of identical houses. Are classes analogous to the blueprint or the houses?
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An accessor method is a method that gets a value from a class's field but does not change it. A mutator method is a method that stores a value in a field or changes the value of a field in some other way.
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What is an accessor method? What is a mutator method?
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It is a good idea to make a field private because it allows only the class's methods to directly access and make changes to the object's internal data, which protects it from corruption.
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Is it a good idea to make a field private? Why or why not?
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If a class has a private field, only the class's methods may directly access and make changes to the object's internal data.
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If a class has a private field, what has access to the field?
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It creates a new instance of an object or class; it is also used to create an array.
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What is the purpose of the "new" key word?
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Constructors are a special type of method that is used to initialize the object. A constructor is invoked at the time of object creation. It constructs the values (i.e., provides data for the object).
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Why are constructors useful for performing "start-up" operations?
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The only time that Java provides a default constructor is when you do not write your own constructor for a class.
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Under what circumstances does Java automatically provide a default constructor for a class?
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No-arg constructor.
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What do you call a constructor that accepts no arguments?
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You can have two methods of the same name so long as they have different signatures—this is called method overloading. The methods also have to return the same type of object, and have the same access modifier.
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When the same name is used for two or more methods in the same class, how does Java tell them apart?
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When a method is overloaded, it means that multiple methods in the same class have the same name, but use different types of parameters. Method overloading is important because sometimes you need several different ways to perform the same operation, so method overloading provides greater flexibility than if it provided only one way to perform every operation.
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How does method overloading improve the usefulness of a class?
