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Lambda expressions are a way of representing
functions , and Java 8 introduces a number of prebuilt
function building blocks as well as a set of function
composition methods. Although lambda expressions are not
quite real functions, they are close enough for most
purposes, and have very succinct syntax that looks like
anonymous functions from Scala (minus the type
declarations) and are even moderately similar to
jаvascript anonymous functions

Streams are wrappers around arrays, collections, or
other data sources that use lambdas pervasively. They
support many convenient and high-performance operations
that use lambdas, including "map", "reduce", "filter"
and "forEach". They also support lazy evaluation, so if
you map firstName over a Stream of Employees, filter the
ones that start with "P", then choose the first, it
really only maps and filters until the first match
Streams can also be made parallel automatically, so that
the operations are done in parallel without having to
write any explicit multithreading code

Lambdas don't exactly turn Java into Lisp, and streams
don't exactly turn Java SE into Hadoop. Nevertheless
they provide significant new capabilities to Java, and
taken together, lambdas and streams result in by far the
biggest change in Java programming style since at least
2004, when generics and annotations were added to the
language

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