I could think of these things,
Arrays.asList(byte[])convertsbyte[]toList<byte[]>,- looping through byte array and add each element to list
I was just wondering Is there any library function to do that?
6 Answers
Library Apache Commons Lang has ArrayUtils.toObject, which turns a primitive array to a typed object array:
int array[] = { 1, 2, 3 };
List<Integer> list = Arrays.asList(ArrayUtils.toObject(array));
1 Comment
jpmottin
For this answer above : if bytes is an arrays of byte (byte[] bytes), you can do this following :
List<Byte> byteList = Arrays.asList(ArrayUtils.toObject(bytes));As this post suggests: the guava Bytes class can help out:
byte[] bytes = ...
List<Byte> byteList = Bytes.asList(bytes);
Comments
For Byte[] instead of byte[] this would work:
Byte[] array = ....
List<Byte> list = Arrays.asList(array);
5 Comments
Eternal Noob
cannot convert from List<byte[]> to List<Byte>
chkal
Yeah, you are right. It only works with Byte[]. I modified the answer.
Eternal Noob
ohh k.. that's interesting... now can i convert byte[] to Byte[]?
chkal
IgorGanapolsky
This solution assumes that your array is of object Byte, not primitive byte!
Java 8 one-line byte[] to List<Byte> conversion, given array as input:
List<Byte> list = IntStream.range(0, array.length).mapToObj(i -> array[i]).collect(Collectors.toList());
Comments
I think the simplest pure Java way, without additional libraries, is this:
private static List<Byte> convertBytesToList(byte[] bytes) {
final List<Byte> list = new ArrayList<>();
for (byte b : bytes) {
list.add(b);
}
return list;
}
But better check twice if you really need to convert from byteto Byte.
1 Comment
Dr. Hans-Peter Störr
stackoverflow.com/questions/3770289/… contains some interesting Java 8 ways.
byte[] byteArray;
List<Byte> medianList=new ArrayList<>();
int median=0,count=0;
Path file=Paths.get("velocities.txt");
if(Files.exists(file)){
byteArray=Files.readAllBytes(file);
}
medianList.addAll(Arrays.asList(byteArray));
1 Comment
Stoica Mircea
Doesn't work, because you've declared the list with Byte and you are trying to add byte.
Arrays.asListnot a "library function"?