所有 stream 源的列表以及它们是有序的还是无序的

Question

Does anyone have, or know of, a list of all possible stream sources, eg collections (including specific types), arrays, functions, I/O, etc, and whether they produce an ordered or unordered stream?

For example, Arrays.stream in the API does not specify whether the stream returned is ordered or unordered? Also, what about the CharSequence chars() method, and data structures such as TreeSet?

Answer 1

Streams are implemented sanely according to the principle of least surprise in all sources by the JDK.

This means that if a stream source has any sort of sensical order, then the stream is correspondingly sensically ordered. The only major sources of unordered streams in the JDK, therefore, are from HashSet s, HashMap views, and Random .

Every other stream that "should" be ordered is ordered: CharStream.chars() , LinkedHashSet.stream() , Files.lines , and so on.

Answer 2

I found this list [here][1] I think it can help answering your question:

 <table> <thead> <tr> <th align="left"></th> <th align="center"><code>ORDERED</code></th> <th align="center"><code>DISTINCT</code></th> <th align="center"><code>SORTED</code></th> <th align="center"><code>SIZED</code></th> <th align="center"><code>NONULL</code></th> <th align="center"><code>IMMUTABLE</code></th> <th align="center"><code>CONCURRENT</code></th> <th align="center"><code>SUBSIZED</code></th> </tr> </thead> <tbody> <tr> <td align="left"><code>Stream.of</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>Arrays.asList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>HashSet</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> </tr> <tr> <td align="left"><code>ArrayList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>ArrayDeque</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>ArrayBlockingQueue</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>ArrayDeque</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>ConcurrentLinkedDeque</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>ConcurrentLinkedQueue</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>DelayQueue</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>CopyOnWriteArraySet</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>CopyOnWriteArrayList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>ConcurrentSkipListSet</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>LinkedBlockingDeque</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>LinkedBlockingQueue</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>LinkedHashSet</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>LinkedList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>Stack</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>RoleUnresolvedList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>RoleList</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>PriorityQueue</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>PriorityBlockingQueue</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>LinkedTransferQueue</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> </tr> <tr> <td align="left"><code>SynchronousQueue</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> <tr> <td align="left"><code>TreeSet</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> </tr> <tr> <td align="left"><code>Vector</code></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center"><code>I</code></td> </tr> </tbody> </table>

I - Injects.

• this the html code of the table. I couldn't copy and paste it as a table in the post editor. you can run it then copy and paste it or, you can check the source website. [1]: https://github.com/stavalfi/lectures/tree/master/Java%20Streams%20-%20Series