Exam 17: Lambdas and Streams

The basic generic functional interface ________ in package java.util.function contains method test that takes a T argument and returns a boolean. Tests whether the T argument satisfies a condition.

Stream reduction operation ________ uses the elements of a collection to produce a single value using an associative accumulation function (e.g., a lambda that adds two elements).

A lambda expression represents a(n) ________ method-a shorthand notation for implementing a functional interface.

Which of the following statements is false?

________ is s method reference for a static method of a class. It creates a one-parameter lambda in which the lambda's argument is passed to the specified a static method and the lambda returns the method's result.

________ is a method reference for an instance method that should be called on a specific object. It creates a one-parameter lambda that invokes the instance method on the specified object-passing the lambda's argument to the instance method-and returns the method's result.

Class Arrays provides ________ stream methods for creating IntStreams, LongStreams and DoubleStreams from int, long and double arrays or from ranges of elements in the arrays.

Which of the following statements is false?

Stream mutable reduction operation ________ creates a new collection of elements containing the results of the stream's prior operations.

Which of the following statements is false?

An________ (package java.util.stream) is a stream that manipulates int values.

What is the meaning of ( ) in the following lambda? () -> System.out.println("Welcome to lambdas!")

________ is a constructor reference. It creates a lambda that invokes the no-argument constructor of the specified class to create and initialize a new object of that class.

Method reduce's first argument is formally called a(n) ________ value-a value that, when combined with any stream element using the IntBinaryOperator produces that element's original value.

Which of the following statements is false?

Intermediate Stream operation ________ results in a stream in which each element of the original stream is mapped to a new value (possibly of a different type)-e.g., mapping numeric values to the squares of the numeric values. The new stream has the same number of elements as the original stream.

The basic generic functional interface ________ in package java.util.function contains method apply that takes a T argument and returns a value of type R. Calls a method on the T argument and returns that method's result.

The basic generic functional interface ________ in package java.util.function contains method accept that takes a T argument and returns void. Performs a task with its T argument, such as outputting the object, invoking a method of the object, etc.

Interface Stream (package java.util.stream) is a generic interface for performing stream operations on objects. The types of objects that are processed are determined by the Stream's ________.

IntStream method ________ performs the count, min, max, sum and average operations in one pass of an IntStream's elements and returns the results as an IntSummaryStatistics object (package java.util).