public class Stack<E>{

private E[] elements;

private int top;

@SuppressWarnings("unchecked")

Stack(int size){

if(size < 2){

throw new IllegalArgumentException(" " + size);

}

elements = (E[])new Object[size];

top = -1;

}

void push (E element) throws StackFullException{

if (top == elements.length - 1){

throw new StackFullException();

}

elements[++top] = element;

}

E pop() throws StackEmptyException{

if(isEmpty()){

throw new StackEmptyException();

}

return elements[top--];

}

boolean isEmpty(){

return top == -1;

}

public static void main(String[] args) throws StackFullException, StackEmptyException{

Stack<String> stack = new Stack<String>(5);

assert stack.isEmpty();

stack.push("A");

stack.push("B");

stack.push("C");

stack.push("D");

stack.push("E");

// Simulate a exception occurance

//stack.push("F");

while(!stack.isEmpty()){

System.out.println(stack.pop());

}

// Simulate to cause a StackEmptyException.

stack.pop();

assert stack.isEmpty();

}

}

class StackEmptyException extends Exception{}

class StackFullException extends Exception{}