Question 1

Which of the following statements is false?

Accepted Answer

A)  Stream method sort orders a stream's elements into ascending order by default. Actually, Stream method sorted orders a stream's elements into ascending order by default. 
B)  To create a collection containing a stream pipeline's results, you can use Stream method collect (a terminal operation). As the stream pipeline is processed, method collect performs a mutable reduction operation that places the results into an object, such as a List, Map or Set. 
C)  Method collect with one argument receives an object that implements interface Collector (package java.util.stream), which specifies how to perform a mutable reduction. 
D)  Class Collectors (package java.util.stream) provides static methods that return predefined Collector implementations. 
A)  Stream method sort orders a stream's elements into ascending order by default. Actually, Stream method sorted orders a stream's elements into ascending order by default. 
B)  To create a collection containing a stream pipeline's results, you can use Stream method collect (a terminal operation). As the stream pipeline is processed, method collect performs a mutable reduction operation that places the results into an object, such as a List, Map or Set. 
C)  Method collect with one argument receives an object that implements interface Collector (package java.util.stream), which specifies how to perform a mutable reduction. 
D)  Class Collectors (package java.util.stream) provides static methods that return predefined Collector implementations.

Question 2

Class IntStream provides terminal operations for common stream ________-count returns the number of elements, min returns the smallest int, max returns the largest int, sum returns the sum of all the ints and average returns an OptionalDouble (package java.util) containing the average of the ints as a value of type double.

Accepted Answer

A)  consolidations 
B)  deductions 
C)  reductions 
D)  trims 
A)  consolidations 
B)  deductions 
C)  reductions 
D)  trims

Question 3

A nice performance feature of lazy evaluation is the ability to perform________ evaluation, that is, to stop processing the stream pipeline as soon as the desired result is available.

Accepted Answer

A)  premature 
B)  short circuit 
C)  terminal 
D)  intermediate 
A)  premature 
B)  short circuit 
C)  terminal 
D)  intermediate

Question 4

Terminal Stream operation ________ performs processing on every element in a stream (e.g., display each element).

Accepted Answer

A)  forNext 
B)  for 
C)  forAll 
D)  forEach 
A)  forNext 
B)  for 
C)  forAll 
D)  forEach

Question 5

Which of the following statements is true?

Accepted Answer

A)  Stream method filter receives a Predicate and results in a stream of objects that match the Predicate. 
B)  Predicate method test returns a boolean indicating whether the argument satisfies a condition. 
C)  Interface Predicate also has methods and, negate and or. 
D)  Each of these statements is true. 
A)  Stream method filter receives a Predicate and results in a stream of objects that match the Predicate. 
B)  Predicate method test returns a boolean indicating whether the argument satisfies a condition. 
C)  Interface Predicate also has methods and, negate and or. 
D)  Each of these statements is true.

Question 6

The basic generic functional interface ________ in package java.util.function contains method apply that takes two T arguments, performs an operation on them (such as a calculation) and returns a value of type T.

Accepted Answer

A) Consumer B) Function C) Supplier D) BinaryOperator A) Consumer B) Function C) Supplier D) BinaryOperator

Question 7

Functional interface BiConsumer's accept method has two parameters. For Maps, the first represents the ________ and the second the corresponding ________.

Accepted Answer

A)  key, variable 
B)  lambda, value 
C)  lambda, variable 
D)  key, value 
A)  key, variable 
B)  lambda, value 
C)  lambda, variable 
D)  key, value

Which of the following statements is false?

A nice performance feature of lazy evaluation is the ability to perform________ evaluation, that is, to stop processing the stream pipeline as soon as the desired result is available.

Terminal Stream operation ________ performs processing on every element in a stream (e.g., display each element).

Which of the following statements is true?

The basic generic functional interface ________ in package java.util.function contains method apply that takes two T arguments, performs an operation on them (such as a calculation) and returns a value of type T.

Functional interface BiConsumer's accept method has two parameters. For Maps, the first represents the and the second the corresponding .

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters

Exam 17: Lambdas and Streams

Which of the following statements is false?

A nice performance feature of lazy evaluation is the ability to perform________ evaluation, that is, to stop processing the stream pipeline as soon as the desired result is available.

Terminal Stream operation ________ performs processing on every element in a stream (e.g., display each element).

Which of the following statements is true?

The basic generic functional interface ________ in package java.util.function contains method apply that takes two T arguments, performs an operation on them (such as a calculation) and returns a value of type T.

Functional interface BiConsumer's accept method has two parameters. For Maps, the first represents the ________ and the second the corresponding ________.

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters

Functional interface BiConsumer's accept method has two parameters. For Maps, the first represents the and the second the corresponding .