write content in a byte array to a file and read the byte from file back to byte array

Question

How can write content in a byte array to a file and read the byte from file back to byte array without changing the content written before. in java

Just open the file in append mode. use this constructor FileWriter(String fileName, boolean append) — AJ.
– AJ., Commented Apr 8, 2015 at 7:20
@EddieB if you don't know the answer then pointing someone to the wrong documentation is very unhelpful. — Boris the Spider
– Boris the Spider, Commented Apr 8, 2015 at 7:24
@Abhishek no. The File API is ancient and should be avoided. See my answer. — Boris the Spider
– Boris the Spider, Commented Apr 8, 2015 at 7:25

Boris the Spider · Accepted Answer · 2015-04-08 07:40:05Z

1

There are two methods for exactly this, in Files

final Path path myFile = Paths.get("path","to","file");
final byte[] toWrite = ...

Files.write(myFile, toWrite, StandardOpenOption.CREATE_NEW);

final byte[] read = Files.readAllBytes(myFile);

assert Arrays.equals(toWrite, read);

edited Apr 8, 2015 at 7:40

answered Apr 8, 2015 at 7:23

Boris the Spider

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