Stream API: Intermediate & Terminal operations. Bengali-Ep:28
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Chapters ❤
0:00 Introduction
00:13 What is Stream, Intermediate and Terminal Operation
07:20 What is Filtering Operation
09:50 Filtering Operation Code Implementaion
25:38 What is Slicing Operation
26:26 What is Slicing Operation Code Implementaion
38:16 What is Mapping Opetaion
38:34 What is Mapping Code Implementaion
45:44 What is Matching Operation
46:30 What is Matching Code Implementaion
Note:
Java was developed by Sun Microsystems (which is now the subsidiary of Oracle) in the year 1995. James Gosling is known as the father of Java. Before Java, its name was Oak. Since Oak was already a registered company, James Gosling and his team changed the name from Oak to Java.
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Stream API .
Stream API was one of the major additions to Java 8. A Stream can be defined as a sequence of elements from a source that supports aggregate operations on them. The source can be collections or arrays that provide data to a stream.
Stream is not a data structure itself. It is a bunch of operations applied to a source. It has basically two types of operations :
Intermediate operations- These methods do not produce any results. They usually accept functional interfaces as parameters and always return a new stream. Some examples of intermediate operations are filter(), map(), etc.
Terminal operations- These methods produce some results, e.g., count(), collect() etc.
1. Filtering - The filtering operations filter the given stream and return a new stream, which contains only those elements that are required for the next operation. This is an intermediate operation.
2. Slicing- slicing operations are intermediate operations, and, as the name implies, they are used to slice a stream. It includes distinct() , limit(), skip().
3. Mapping- Mapping operations are those operations that transform the elements of a stream and return a new stream with transformed elements.Map() and flatMap() are the most commonly used methods.
4. Matching- Matching operations are terminal operations that are used to check if elements with certain criteria are present in the stream or not. Mostly three operations of matching are used : anyMatch(), allMatch(), noneMatch().
5. Finding- Finding operations are terminal operations that are used to get the matched element instead of just verifying if it is present or not. There are two basic finding operations in streams, i.e., findAny(), findFirst() .
7. Collect- It is a terminal method. We can create our own collector implementation or We can use the predefined implementations provided by the collectors class. Collectors has various methods like — toList(), toMap(), toSet(),CollectingAndThen() , groupingBy(), partitioningBy(), minBy(), maxBy() etc.