code: private void getElements(final int from, final char[] a, final int offset, final int length) {
          CharArrays.ensureOffsetLength(a, offset, length);
          System.arraycopy(this.a, from, a, offset, length);
      }
docs: Copies element of this type-specific list into the given array using optimized system calls.
  
  @param from   the start index (inclusive).
  @param a      the destination array.
  @param offset the offset into the destination array where to store the first element copied.
  @param length the number of elements to be copied.