JAVA 8 STREAM API FILTER METHOD DEMO | Explain Java Stream API Filter Demo | InterviewDOT

Publicado em: 09 Setembro 2017
no canal de: Interview DOT

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Click here - / @interviewdot to get notifications. Java 8 Stream API:
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"map, filter, foreach"

Input - Filter a collection for a given Predicate instance.

Output - filter() method returns a Stream instance which consists only filtered element on the basis of given Predicate.

Syntax :

filter(Predicate predicate)

Predicate is functional interface :

Examples :
1) Find all kids borned after a particular date.
2) Cake ordered at specific time.
3) Students greater than certain age.

https://github.com/net-vinothkumar/le...

Stream filter() in Java with examples
Stream filter(Predicate predicate) returns a stream consisting of the elements of this stream that match the given predicate. This is an intermediate operation. These operations are always lazy i.e, executing an intermediate operation such as filter() does not actually perform any filtering, but instead creates a new stream that, when traversed, contains the elements of the initial stream that match the given predicate.

The filter method is available for Java 8 streams. With the filter method, objects in the stream can be checked according to one or more criteria. If the check returns a true result, then the object remains in the stream. If false, it is not accepted and is no longer available for further processing

Streams of the interface java.util.stream.StreamT , not to be confused with the input and output streams of the package java.io, are streams of references that allow chained operations on these references to be performed sequentially or in parallel. The data represented by the references are not changed by the stream itself.
The interface and the interfaces derived from it only provide a variety of methods, which are divided into two main categories and are usually given lambda expressions as arguments:

intermediate operations ( intermediate operations ) in turn provide Stream, which can be further processed (eg filter(), map(), distinct(), sorted(), etc.).
terminal operations ( terminal operations ) in turn lead operations on the references of the stream from ( forEach(), reduce(), toArray(), etc.). You can supply a value and stop the electricity. Once a stream is closed, no further operations can be performed on it.

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