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Streams in general perform input and output of data. Java 8 added a package called java.util.stream to stream the output and the input of functions. That means that functions can be piped together.

A stream can be created by calling the method stream():

	Stream<String> s = myArrayList.stream();

It can also be created by using Stream.of() on a series of objects:

	Stream s = Stream.of("a","b");

Here's a code example that uses streams:

	Stream.of(5,4,8,1)
		.map(n -> 2 * n)
		.sorted()
		.filter(s -> s < 10)
		.forEach(System.out::println);	

Operations are either intermediate or terminal, where the last operation is always terminal.