What is Stream in Java8

• Java 8 Streams concept is based on converting Collections to a Stream, processing the elements in parallel and then gathering the resulting elements into a Collection
• functional-style operations on streams of elements, such as map-reduce transformations on collections
• streams are wrappers around a data source, allowing us to operate with that data source and making bulk processing convenient and fast
• A stream pipeline consists of a stream source, followed by zero or more intermediate operations, and a terminal operation

• Operations on Streams

  ```java List names = students.stream() .map(Student::getName) .filter(name->name.startsWith("A")) .collect(Collectors.toList());

//This is equvelent to List names =newArrayList<>(); for(Student student : students){ if(student.getName().startsWith("A")){ names.add(student.getName()); } }

### Intermediate Operation
### Terminal Operation


## Creating a Stream
- Number Streams using ***IntStream, DobuleStream,LongStream***
```java
IntStream.rangeClosed(1, 10).forEach(num -> System.out.print(num)); // ->12345678910
IntStream.range(1, 10).forEach(num -> System.out.print(num)); // ->123456789

• Creating Stream of hardcoded Strings and printing each String

  Stream.of("This", "is", "Java8", "Stream").forEach(System.out::println);
  

• Creating stream of arrays

  String[] stringArray = new String[]{"Streams", "can", "be", "created", "from", "arrays"};
  Arrays.stream(stringArray).forEach(System.out::println);
  

• Creating BufferedReader for a file

  BufferedReader reader = Files.newBufferedReader(Paths.get("File.txt"), standardCharsets.UTF_8);
  //BufferedReader's lines methods returns a stream of all lines
  reader.lines().forEach(System.out::println);