$/**$ Appends value at the end of the AList, increasing size by $1.$

$*$ Grows the array if needed to fit the appended value $*/$

public void append$($T value$)\{$

$\}$

$/**$ Removes and returns the value at the end of the AList.

$*$ this $*$does$*$ modify size and cannot modify capacity.

$*$ @throws NoSuchElementException if size $==0*/$

public T pop$()\{$

$//$ TODO $4$b

throw new UnsupportedOperationException$()$; $//$ delete this once implemented!

$\}$