how to buffer readings from very big files like over 20 MB

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task completed but i have not figured out yet how to buffer readings from very big files. i have used

fileInputStream.read()

to read from file but for length of above 20 MB it is very slow. if i will use

fileInputStream.read(chunkArray)

then i could not add this chunk arrays into ArrayList because chunkArray holds byte items but ArrayList can hold only Byte data. i wonder if there is a solution or maybe we should avoid to store such large amounts of data in RAM

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WIDMO

Level 41 , Gdańsk, Poland

16 September 2020, 12:54

solution

I guess that depends on size of file and RAM, but the the easiest way is to use temporary files to manage that. You should check class Files ( to be more precise Files.createTempFile() )

Sela

Level 20 , Poland

17 September 2020, 12:36

i came to conclusion that for medium files we can use also ArrryList of byte[] arrays like

ArrayList<byte[]> sourceData = new ArrayList<>();

where each byte[] array is a chunk of data read from stream

fileInputStream.read(chunk = new byte[chunkLength])