Convert an array of primitive longs into a List of Longs
Since Java 8 you can now use streams for that:
long[] arr = { 1, 2, 3, 4 };List<Long> list = Arrays.stream(arr).boxed().collect(Collectors.toList());
I found it convenient to do using apache commons lang ArrayUtils (JavaDoc, Maven dependency)
import org.apache.commons.lang3.ArrayUtils;...long[] input = someAPI.getSomeLongs();Long[] inputBoxed = ArrayUtils.toObject(input);List<Long> inputAsList = Arrays.asList(inputBoxed);it also has the reverse API
long[] backToPrimitive = ArrayUtils.toPrimitive(objectArray);EDIT: updated to provide a complete conversion to a list as suggested by comments and other fixes.
import java.util.Arrays;import org.apache.commons.lang.ArrayUtils;List<Long> longs = Arrays.asList(ArrayUtils.toObject(new long[] {1,2,3,4}));