#STREAMS IN JAVA HOW TO#
#STREAMS IN JAVA CODE#

This is a terminal stream operation.Дefinition of noneMatch() Method вЂ“ The Stream.noneMatch() method has the following signature вЂ“ The moment this method finds the first element satisfying the predicate, it skips the testing of the remaining elements using the concept of short-circuit evaluation and returns false as the result.

If one (or more) of the elements match the predicate condition then the method returns false. Stream.noneMatch() method returns true if none of the elements of the stream match the provided predicate condition.

Since, there are 2 employees of age greater than 40 years, the predicate is satisfied and the anyMatch() method returns true.

This predicate condition states that the EmployeeвЂ™s age should be greater than 40 years.

On the stream of Employees we call the anyMatch() method with the Predicate instance being specified as its equivalent lambda expression вЂ“ emp -> emp.getAge() > 40.

#STREAMS IN JAVA CODE#

This is a terminal stream operation.ДЄny employee is above 40:true Explanation of the code The moment this method finds the first element satisfying the predicate, it skips the testing of the remaining elements using the concept of short-circuit evaluation and returns true as the result. If none of the elements match the predicate condition then the method returns false. Stream.anyMatch() method returns true if at least 1 of the elements of the stream match the provided predicate condition.

Since, all the employees are of age greater than 21 years, so the Predicate is satisfied for all the Employees, and the allMatch() method returns true.

This predicate condition states that the EmployeeвЂ™s age should be greater than 21 years.

On the stream of Employees we call the allMatch() method with the Predicate instance being specified as its equivalent lambda expression Click to read tutorial on Java 8 Lambda Expressions вЂ“ emp -> emp.getAge() > 21.

In the main() method we create a Stream of Employees using the stream() method of List interface.

employeeList is a static list of 5 Employees.

It has two main attributes вЂ“ name and age.

Employee is the class of which we will be creating a Stream.

Java 8 provides such declarative matching with predicate conditions using three methods defined on the Streams API which are вЂ“ allMatch(), anyMatch() and noneMatch().ДЄll employees are above 21:true Explanation of the code once you define the condition using a Predicate instance, and provide this Predicate as an input to the matching methods, then Java 8 processes the matching function internally and provides you with the result whether a match for the condition was found or not. Instead of writing logic for iterating over the stream elements and checking each object whether it matches the criteria (which is more of an imperative rather than functional Click to understand the difference between the two programming styles style of programming), Java 8 Streams allow declarative matching of objects in the stream. Given a stream of objects, many-a-times we need to check whether object(s) in the given stream match a specific criteria. What is вЂmatchingвЂ™ in the context of Streams This tutorial assumes that you are familiar with basics of Java 8 Streams API Read Basics of Java 8 Streams API.

#STREAMS IN JAVA HOW TO#

Introduction вЂ“ Java 8 Matching with Streams tutorial explains how to match elements in a stream using the allMatch(), anyMatch() and noneMatch() methods provided by the Streams API with examples to show their usage.

Streams in java