Implementation of Collection.stream()

Adit A. Pillai :

I have been working on JDK 1.8 for a few days now where I came across some piece of code which was similar to this:

List<Integer> list = Arrays.asList(1,2,3,4,5);
list.stream();

Now, easy and clean as it may appear to the people who have been working with streams (java.util.stream), I could not find the the actual class that implements the java.util.Collection.stream() method.

I have the following questions, when I say list.stream():

1. Where do I get the java.util.stream.Stream from?
2. How did they implement it without actually "disturbing" the existing collections?(assuming that they did not touch them)

I did try to look through the documentations of java.util.AbstractCollection and java.util.AbstractList but was unable to find it.

Jeremy Grand :

Java 8 allows the definition of default methods in interfaces.

Collection<E> then defines :

default Stream<E> stream() {
    return StreamSupport.stream(spliterator(), false);
}

That's how they added it.

Guess you like

Origin http://10.200.1.11:23101/article/api/json?id=430031&siteId=1

Implementation of Collection.stream()

Does Collection.stream() have internal synchronization?

Имеют ли Collection.stream () имеет внутреннюю синхронизацию?

Collection implementation class ArrayList

Implementation Architecture of ImmutableSet Collection

Implementation Architecture of HashSet Collection

Scala collection implementation WordCount code implementation

The underlying implementation principle of each implementation class of the collection

The underlying implementation principle of each implementation class of the collection

Stream flow implementation Fibonacci number

JAVASE collection (underlying HashMap implementation)

The implementation of java~collection grouping groupby

Vuex shopping cart collection implementation

Java uses buffered stream implementation file copy

Storm Stream Grouping writing custom grouping implementation

--Set Java collection interfaces, HashSet implementation class, TreeSet implementation class, LinkedHashSet implementation class

Collection of frequently used applications and implementation class summary

Visa personal collection program implementation principle autoxpay

Set the collection implementation class HashSet, TreeSet and LinkedHashSet

Java implementation LeetCode 645 error collection (violence)

Redis design and implementation_6. Integer collection

List interface and implementation class (collection continued)

Implementation of the hovering effect of the iOS collection header

Log collection system architecture design and development implementation

js implementation as the home page, add to the collection

Implementation of "Java Data Structure" ArraySet Collection

Java collection container ArrayList and LinkedList minimalist implementation

Common implementation classes under Collection and Map

Java basics - Set collection implementation class

Understand the implementation class of Collection (List, Set, Map)