Term
When you use an enumerated type variable as a switch selector, the case labels in the switch body should use:
Answer
a. the fully-qualified enumerated type member names
b. integral constants
c. the unqualified enumerated type member names
d. integral constants or int literals |
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Definition
| c. the unqualified enumerated type member names |
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Term
The members of an enumerated type are _______________.
Answer
a. constants
b. instance variables
c. fields
d. strings |
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Definition
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Term
When you assign values to an enumerated type variable, the values must be:
Answer
a. any reference type
b. members defined in the enumeration
c. Int
d. Object
e. String |
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Definition
| b. members defined in the enumeration |
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Term
When you override a method defined in a superclass, you must do all of these except:
Answer
a. Use an access specifier that is at least as permissive as the superclass method
b. Return exactly the same type as the original method.
c. Use exactly the same number and type of parameters as the original method.
d. Change either the number, type, or order of parameters in the subclass. |
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Definition
| d. Change either the number, type, or order of parameters in the subclass. |
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Term
A ____________ relationship exists between two classes when one class contains fields that are instances of the other class.
Answer
a. superclass-subclass
b. has-A
c. is-A
d. inheritance |
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Definition
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Term
Inheritance gives your programs the ability to express _______________ between classes.
Answer
a. encapsulation
b. composition
c. dependencies
d. relationships |
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Definition
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Term
To call a superclass method from a subclass method, when both methods have the same name and signature, prefix the call to the superclass method with:
Answer
a. this
b. base
c. the name of the superclass (that is, Person, if that is the name of the superclass)
d. no prefix is necessary. You cannot call an overridden superclass method from the subclass method you've overridden.
e. super |
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Definition
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Term
To prevent subclasses from overriding an inherited method, the superclass can mark the method as:
Answer
a. static
b. public
c. protected
d. final
e. private |
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Definition
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Term
Examine the following method. (Some lines may be syntactically incorrect.) You may assume that any necessary imports have already been added to the program.
public void run()
{
GImage img = new GImage("b.gif");
ArrayList a; // I
ArrayList![]() b; // II
a = new ArrayList(img); // III
a = new ArrayList(img); // IV
new ArrayList(); // V
}
Which lines correctly compile?
Answer
a. I, IV and V
b. I only
c. II and III only
d. I and IV only |
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Definition
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Term
ArrayList objects can hold any object type. To store and retrieve int values in the collection, the ArrayList employs a technique called:
Answer
a. casting
b. coercion
c. boxing
d. setting
e. downcasting |
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Definition
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Term
In the type-safe version of the ArrayList class, you specify the type of each element by:
Answer
a. specifying a generic type parameter when defining the ArrayList variable
b. using the setType() method once the ArrayList is constructed
c. passing a Class parameter as the first argument to the constructor
d. using the special type-safe version of the subscript operator
e. None of these; an ArrayList can hold any object type |
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Definition
| a. specifying a generic type parameter when defining the ArrayList variable |
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