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 do i convert for an array, the below is not right but can anyone correct it?

long[] l_ar = (Long[])Object[]   

Answer 1

You could steal a solution based on ArrayUtils

Long[] longObjects = { 1L, 2L, 3L }; long[] longArray = ArrayUtils.toPrimitive(longObjects); 

Answer 2

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; }