convert Long[] to long[] (primitive) java

Question

How do i convert Long[] to long[]? For example i know how to convert if it is not array as below.

long ll = (Long)Object[1].longValue()

But how

Answer 1

There are no standard API method for doing that (how would null-elements be handled?) so you would need to create such a method yourself.

Something like this (will throw NullPointerException on any object beeing null):

public static long[] toPrimitives(Long... objects) {

    long[] primitives = new long[objects.length];
    for (int i = 0; i < objects.length; i++)
         primitives[i] = objects[i];

    return primitives;
}