COSC 1437 CH3
One or more objects may be created from a(n)
Class
A method that gets a value from a class's field but does not change it is known as a mutator method.
False
The public access specifier for a field indicates that the field may not be accessed by statements outside the class.
False
The term "default constructor" is applied to the first constructor written by the author of the class.
False
When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.
False
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
Methods
A constructor is a method that is automatically called when an object is created.
True
An access specifier indicates how the class may be accessed.
True
The java.lang package is automatically imported into all Java programs.
True
The term "no-arg constructor" is applied to any constructor that does not accept arguments.
True
Which of the following is not involved in finding the classes when developing an object-oriented application?
Write the code.
What does the following UML diagram entry mean? +setHeight(h:double):void
a public method with a parameter of data type double that does not return a value
What is the following statement an example of? import java.util.*;
a wildcard import statement
What is the following statement an example of? import java.util.Scanner;
an explicit import statement
If you do not provide initialization values for a class's numeric fields, they will
be automatically initialized with 0.
A class's responsibilities include
both the things a class is responsible for knowing and the things a class is responsible for doing
The key word new
creates an object in memory
It is common practice in object-oriented programming to make all of a class's
fields private
A constructor
has the same name as the class.
You use this key word to import a class.
import
You should not define a class field that is dependent upon the values of other class fields
in order to avoid having stale data.
Another term for an object of a class is a(n)
instance
When an object is created, the attributes associated with the object are called
instance fields.
A method
may have zero or more parameter variables.
UML diagrams do not contain
object names
In the blueprint/house analogy, think of a class as a blueprint that describes a house and ________ as instances of the house built from the blueprint.
objects
A group of related classes is called a(n)
package
A constructor is a method that
performs initialization or setup operations.
The scope of a local variable is
the method in which they are defined.
When an argument is passed by value,
the parameter variable holds the address of the argument.
To indicate the data type of a variable in a UML diagram, you specify
the variable name followed by a colon and the data type.
Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by
using the private access specifier on the class fields.
In UML diagrams, what symbol indicates that a member is public?
+
For the following code, which statement is not true? public class Circle { private double radius; public double x; private double y; }
The y field is available to code that is written outside the Circle class.
