01. Introduction to Stream api in java
Introduced in Java 8, the Stream API is used to process collections of objects. A stream is a sequence of objects that supports various methods which can be pipelined to produce the desired result.
Stream() method in stream apiin java
A sequence of elements supporting sequential and parallel aggregate
operations. The following example illustrates an aggregate operation using stream
Filter() method in java
Returns a stream consisting of the elements of this stream that match the given predicate.
This is an intermediate operation param predicate a non-interfering stateless
predicate to apply to each element to determine if it should be included return the new stream
Reduce() method in stream api:
Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an describing the reduced value,if any.
Sorted() method in Sream api in java
Returns a stream consisting of the elements of this stream, sorted according to natural order. If the elements of this stream are not
Comparable may be thrown when the terminal operation is executed.For ordered streams, the sort is stable. For unordered streams, no stability guarantees are made.
This is a stateful intermediate operation.
Map() method in stream api in java
Returns a stream consisting of the results of applying the given function to the elements of this stream.This is an intermediate operation The element type of the new stream mapper a non-interfering, stateless function to apply to each element return the new stream
Limit() method in Stream api in java
Returns a stream consisting of the elements of this stream, truncated to be no longer than maxSize in length.
Skip() method in stream api in java
Returns a stream consisting of the remaining elements of this stream, after discarding the first {@code n} elements of the stream.If this stream contains fewer than n elements then an empty stream will be returned.
Peek() method in stream api
Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.
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