Question 1

Suppose Stack is a generic class that has one type parameter.The following assignment Stack integerStack = new Stack( 10 );
Is __________.

Accepted Answer

A) illegal. 
B) permitted and safe. 
C) permitted but unsafe,the compiler issues a warning message. 
D) permitted but unsafe,the runtime environment issues a warning message. 
A) illegal. 
B) permitted and safe. 
C) permitted but unsafe,the compiler issues a warning message. 
D) permitted but unsafe,the runtime environment issues a warning message. C

Question 2

All generic method declarations have a type parameter section delimited by __________.

Accepted Answer

A) curly brackets ({ and }). 
B) angle brackets (). 
C) square brackets ([ and ] ). 
D) parenthesis. 
A) curly brackets ({ and }). 
B) angle brackets (). 
C) square brackets ([ and ] ). 
D) parenthesis. B

Question 3

When compiling a generic class,the __________ option should be used to view the unchecked warning message.

Accepted Answer

A) -Xlint:unchecked. 
B) -X:unchecked. 
C) -warning:unchecked. 
D) -unchecked. 
A) -Xlint:unchecked. 
B) -X:unchecked. 
C) -warning:unchecked. 
D) -unchecked. A

Question 4

Which statement is false?

Accepted Answer

A) A generic method may be overloaded. 
B) A class can provide two or more generic methods that specify the same method name but different method parameters. 
C) A generic method cannot be overloaded by non-generic methods. 
D) When the compiler encounters a method call,it searches for the method declaration that most precisely matches the method name and the argument types specified in the call. 
A) A generic method may be overloaded. 
B) A class can provide two or more generic methods that specify the same method name but different method parameters. 
C) A generic method cannot be overloaded by non-generic methods. 
D) When the compiler encounters a method call,it searches for the method declaration that most precisely matches the method name and the argument types specified in the call.

Question 5

__________ enable programmers to specify,with a single method declaration,a set of related methods.

Accepted Answer

A) Overloaded methods. 
B) Overriden methods. 
C) Generic methods. 
D) Generics. 
A) Overloaded methods. 
B) Overriden methods. 
C) Generic methods. 
D) Generics.

Question 6

Which statement is false?

Accepted Answer

A) A generic class can be derived from a non-generic class. 
B) A non-generic class cannot be derived from a generic class. 
C) A generic class can be derived from another generic class. 
D) A generic method in a subclass can override a generic method in a superclass if both methods have the same signatures. 
A) A generic class can be derived from a non-generic class. 
B) A non-generic class cannot be derived from a generic class. 
C) A generic class can be derived from another generic class. 
D) A generic method in a subclass can override a generic method in a superclass if both methods have the same signatures.

Question 7

__________ is the default upper bound of a type parameter.

Accepted Answer

A) String. 
B) Comparable. 
C) Class. 
D) Object. 
A) String. 
B) Comparable. 
C) Class. 
D) Object.

Question 8

Which statement is false?

Accepted Answer

A) When declaring a generic method,the type parameter section is placed before the return type of the method. 
B) Each type parameter section contains only one type parameter. 
C) A type parameter is an identifier that specifies a generic type name. 
D) Type parameters can represent only reference types. 
A) When declaring a generic method,the type parameter section is placed before the return type of the method. 
B) Each type parameter section contains only one type parameter. 
C) A type parameter is an identifier that specifies a generic type name. 
D) Type parameters can represent only reference types.

Question 9

Which statement is false?

Accepted Answer

A) Parameterized type ArrayList is a supertype of ArrayList. 
B) ArrayList implements a dynamically resizable,array-like data structure. 
C) A wildcard represents an "unknown type". 
D) Because the wildcard in a method's header does not specify a type parameter name,you cannot use it as a type name throughout the method's body. 
A) Parameterized type ArrayList is a supertype of ArrayList. 
B) ArrayList implements a dynamically resizable,array-like data structure. 
C) A wildcard represents an "unknown type". 
D) Because the wildcard in a method's header does not specify a type parameter name,you cannot use it as a type name throughout the method's body.

Question 10

When a generic class is instantiated without specifying a type argument,it is said to have a __________.

Accepted Answer

A) empty type. 
B) raw type. 
C) null type. 
D) abstract type. 
A) empty type. 
B) raw type. 
C) null type. 
D) abstract type.

Question 11

Generics provide __________ that allows programmers to catch invalid types at compile time.

Accepted Answer

A) compile-time type safety. 
B) compile-time exception handling. 
C) compile-time error checking. 
D) run-time type safety. 
A) compile-time type safety. 
B) compile-time exception handling. 
C) compile-time error checking. 
D) run-time type safety.

Question 12

When the compiler translates a generic method into Java bytecodes,it uses __________ to replace the type parameters with actual types.

Accepted Answer

A) erasure. 
B) compile-time type replacement. 
C) compile-time type checking. 
D) compile-time type safety. 
A) erasure. 
B) compile-time type replacement. 
C) compile-time type checking. 
D) compile-time type safety.

Question 13

A wildcard type argument is denoted by a(n)__________.

Accepted Answer

A) asterisk (*). 
B) underscore (_). 
C) question mark (?). 
D) caret (^). 
A) asterisk (*). 
B) underscore (_). 
C) question mark (?). 
D) caret (^).

Exam 21: Generic Classes and Methods

Suppose Stack is a generic class that has one type parameter.The following assignment Stack< Integer > integerStack = new Stack( 10 ); Is __________.

All generic method declarations have a type parameter section delimited by __________.

When compiling a generic class,the __________ option should be used to view the unchecked warning message.

Which statement is false?

__________ enable programmers to specify,with a single method declaration,a set of related methods.

Which statement is false?

__________ is the default upper bound of a type parameter.

Which statement is false?

Which statement is false?

When a generic class is instantiated without specifying a type argument,it is said to have a __________.

Generics provide __________ that allows programmers to catch invalid types at compile time.

When the compiler translates a generic method into Java bytecodes,it uses __________ to replace the type parameters with actual types.

A wildcard type argument is denoted by a(n)__________.

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Atm Case Study,part 1: Object-Oriented Design With the Uml

Atm Case Study,part 2: Implementing an Object-Oriented Design

Gui Components: Part 1

Graphics and Java 2d

Strings

Files,streams and Object Serialization

Recursion

Searching, Sorting and Big O

Generic Collections

Custom Generic Data Structures

Applets and Java Web Start

Multimedia: Applets and Applications

Gui, Part 2

Multithreading

Networking

Accessing Databases With Jdbc

Java Server Faces Web Applications

Ajax-Enabled Jsf Web Applications

Web Services

Filters