In this recipe, you will learn how to create streams from different sources. You have different options, as the following:

• The parallelStream() method of the Collection interface
• The Supplier interface
• A predefined set of elements
• File and a directory
• An array
• A random number generator
• The concatenation of two different streams

You can create a Stream object from other sources (that will be described in the There's more section), but we think that these are the more useful.