1. Given the following stack class declaration, write the following methods using an array- based implementation public void push(E data) public E pop) public boolean isFullO . public boolean isEmpty0 Note: there is no cu rrentSize variable here. Do we need it? class Stack private int head: private int maxSize; private object stack: public Stack(int size) ( maxSize size; head =-1 ; stack new object (maxSize) public void push (E data) public E pop ) public boolean isFull) public boolean isEmpty )