Question 1

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 2

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. A

Question 3

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. B

Question 4

Class Number is ________ of both Integer and Double.

Accepted Answer

A)  the subclass 
B)  composed 
C)  a descendent 
D)  the superclass 
A)  the subclass 
B)  composed 
C)  a descendent 
D)  the superclass

Question 5

Which of the following statements is false?

Accepted Answer

A)  Wildcard type arguments enable you to specify method parameters, return values, variables, and so on, that act as supertypes of parameterized types. 
B)  A wildcard-type argument is denoted by ?, which represents an "unknown type." 
C)  Because a wildcard is a type-parameter name, you can use it as a type name throughout a method's body. 
D)  If a wildcard is specified without an upper bound, then only the methods of type Object can be invoked on values of the wildcard type. 
A)  Wildcard type arguments enable you to specify method parameters, return values, variables, and so on, that act as supertypes of parameterized types. 
B)  A wildcard-type argument is denoted by ?, which represents an "unknown type." 
C)  Because a wildcard is a type-parameter name, you can use it as a type name throughout a method's body. 
D)  If a wildcard is specified without an upper bound, then only the methods of type Object can be invoked on values of the wildcard type.

Question 6

__________ 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 7

Which of the following statements is true?

Accepted Answer

A)  Overloaded methods are often used to perform similar operations on different types of data. 
B)  When the compiler encounters a method call, it attempts to locate a method declaration with a name and parameters that are compatible with the argument types in the method call. 
C)  Both a and b are true. 
D)  Neither a nor b is true. 
A)  Overloaded methods are often used to perform similar operations on different types of data. 
B)  When the compiler encounters a method call, it attempts to locate a method declaration with a name and parameters that are compatible with the argument types in the method call. 
C)  Both a and b are true. 
D)  Neither a nor b is true.

Question 8

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

Accepted Answer

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

Question 9

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 10

__________ 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 11

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 12

One generic Stack class could be the basis for creating many Stack classes,

Accepted Answer

A) subclasses. B) generic subclasses. C) concrete classes. D) parameterized classes. E) g., Stack, Stack and Stack. These classes are known as __________. A) subclasses. B) generic subclasses. C) concrete classes. D) parameterized classes. E) g., Stack, Stack and Stack. These classes are known as __________.

Question 13

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.

Question 14

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 (^).

Question 15

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.

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

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

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

Class Number is ________ of both Integer and Double.

Which of the following statements is false?

__________ is the default upper bound of a type parameter.

Which of the following statements is true?

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

Which statement is false?

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

Which statement is false?

One generic Stack class could be the basis for creating many Stack classes,

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

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

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

Introduction to Computers and Java

Introduction to Java Applications

Control Statements

Control Statements

Methods

Arrays and Arraylists

Introduction to Classes and Objects

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components

Graphics and Java 2D

Fundamentals of Characters and Strings

Files, Streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Custom Generic Data Structures

GUI

Concurrency

Accessing Databases With JDBC

JavaFX

Filters

Exam 20: Generic Classes and Methods

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

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

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

Class Number is ________ of both Integer and Double.

Which of the following statements is false?

__________ is the default upper bound of a type parameter.

Which of the following statements is true?

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

Which statement is false?

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

Which statement is false?

One generic Stack class could be the basis for creating many Stack classes,

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

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

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

Introduction to Computers and Java

Introduction to Java Applications

Control Statements

Control Statements

Methods

Arrays and Arraylists

Introduction to Classes and Objects

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components

Graphics and Java 2D

Fundamentals of Characters and Strings

Files, Streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Custom Generic Data Structures

GUI

Concurrency

Accessing Databases With JDBC

JavaFX

Filters