How do I create an empty Stream in Java?

JavaJava StreamEnumerable

Java Problem Overview

In C# I would use Enumerable.Empty(), but how do I create an empty Stream in Java?

Java Solutions

Solution 1 - Java

As simple as this: Stream.empty()

Solution 2 - Java

Stream<String> emptyStr = Stream.of();

emptyStr.count() returns 0 (zero).


In addition:

  • For a primitive stream like IntStream, IntStream.of() works in similar way (also the empty method). IntStream.of(new int[]{}) also returns an empty stream.
  • The Arrays class has stream creation methods which accept an array of primitives or an object type. This can be used to create an empty stream; e.g.,: System.out.println(Arrays.stream(new int[]{}).count()); prints zero.
  • Any stream created from a collection (like a List or Set) with zero elements can return an empty stream; for example: new ArrayList<Integer>().stream() returns an empty stream of type Integer.
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