a) To determine the difference between two Instants, use class Duration’s static method
difference, which returns a Duration object containing the time difference.
b) Streams are easy to parallelize, enabling programs to benefit from enhanced performance
on multi-core systems.
c) Interface Supplier, like interface Callable, is a functional interface with a single method
that receives no arguments and returns a result.
d) CompletableFuture static method runAsync asynchronously executes a Supplier task
that returns a value.
e) CompletableFuture static method supplyAsync asynchronously executes a Runnable
task that does not return a result.
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