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When collecting a java.util.stream.Stream, why is not its method void close() called ?
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Java provides a new additional package in Java 8 called java. util. stream. This package consists of classes, interfaces and enum to allows functional-style operations on the elements.
This functionality – java. util. stream – supports functional-style operations on streams of elements, such as map-reduce transformations on collections. Let's now dive into few simple examples of stream creation and usage – before getting into terminology and core concepts.
Introduced in Java 8, the Stream API is used to process collections of objects. A stream is a sequence of objects that supports various methods which can be pipelined to produce the desired result.
Java provides three predefined stream objects: in, out, and err, defined in the System class of the java.
Per the Stream javadoc,
Streams have a BaseStream.close() method and implement AutoCloseable, but nearly all stream instances do not actually need to be closed after use. Generally, only streams whose source is an IO channel (such as those returned by Files.lines(Path, Charset)) will require closing. Most streams are backed by collections, arrays, or generating functions, which require no special resource management. (If a stream does require closing, it can be declared as a resource in a try-with-resources statement.)
So, it sounds like you need to use a try-with-resources Statement.
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