There is a trick to make the Stream
implementation calling close()
after the terminal operation:
List<String> rows = Stream.of(Files.lines(inputFilePath)).flatMap(s->s)
.collect(Collectors.toList());
It simply creates a stream encapsulating the stream of lines as a single item and uses flatMap
with an identity function (Function.identity()
would work as well) to turn it into a stream of lines again.
The interesting point is a property of Stream.flatMap(…)
:
Each mapped stream is closed after its contents have been placed into this stream.
So the code above will close the stream of lines. While it looks more concise it has the disadvantage over try with resources that current implementation of flatMap
lacks lazy evaluation which is not relevant here as you are collecting all lines into a list anyway. But it’s something to keep in mind when using this trick in other scenarios.
For the question’s code as-is there is an even simpler solution:
List<String> rows = Files.readAllLines(inputFilePath);
Reads all lines and closes all resources…
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…