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

__________ 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. D

Question 3

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. C

Question 4

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 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

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 7

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 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

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 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

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 12

One generic Stack class could be the basis for creating many Stack classes,e.g.,Stack,Stack and Stack.These classes are known as __________.

Accepted Answer

A) subclasses. 
B) generic subclasses. 
C) concrete classes. 
D) parameterized classes. 
A) subclasses. 
B) generic subclasses. 
C) concrete classes. 
D) parameterized classes.

Question 13

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 14

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 15

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 (^).

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

__________ is the default upper bound of a type parameter.

Which of the following statements is false?

Which of the following statements is true?

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

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

Which statement is false?

Which statement is false?

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

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

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

One generic Stack class could be the basis for creating many Stack classes,e.g.,Stack<Double>,Stack<Integer> and Stack<Employee>.These classes are known as __________.

Class Number is ________ of both Integer and Double.

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)__________.

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

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters

Exam 20: Generic Classes and Methods

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

__________ is the default upper bound of a type parameter.

Which of the following statements is false?

Which of the following statements is true?

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

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

Which statement is false?

Which statement is false?

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

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

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

One generic Stack class could be the basis for creating many Stack classes,e.g.,Stack<Double>,Stack<Integer> and Stack<Employee>.These classes are known as __________.

Class Number is ________ of both Integer and Double.

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)__________.

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

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters