Design Patterns and Best Practices in Java

The from operator

Converting from an arrays, futures, or other objects and data structures can be done by calling one of the following methods:

• fromArray: Converts an array to an Observable
• fromCallable: Converts a callable that supplies a value to an Observable
• fromFuture: Converts a future provided value to an Observable
• fromIterable: Converts an iterable to an Observable
• fromPublisher: Converts a reactive publisher stream to an Observable
• just: Converts a given object to an Observable

The following example creates an Observable out of a list of letters (abc):

The entire array of a, b, and c is consumed and printed to the console by the ...