Stream never modifies the source data, it processes it and gives us the result without modifying the original data.
Java: Beginner Guide to Stream API
a thread...
Stream never modifies the source data, it processes it and gives us the result without modifying the original data.
1. Collection. stream()
2. Stream.of(T... values)
3. Arrays. stream()
4. Stream.builder()
Eg:️
1. Intermediate Operations(IO)
2. Terminal Operations(TO)
Here's what the stream pipeline looks like:
Source -> Intermediate Operations -> Terminal Operations
It returns another stream object, after this, we can either call another IO or TO.
Few methods in Stream API for Intermediate operations:
1. filter()
2. map()
3. sorted()
and many more...
filter() - filters out the data based on any boolean condition - below we're filtering elements starting with the letter a.
map() - performs some given operation on the whole data set - below we're converting every element to upper case.
It's the last operation done on stream that's why it's called terminal.
This operation returns the final result.
Few methods in Stream API for Terminal operations:
1. collect()
2. count()
3. forEach()
and many more...
collect() - collects the elements in the given collection as shown below in the first case it is returning data in the form of a list.
count() - counts the no of the element in the stream and returns in the form of long.
