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Stack.java

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import java.util.EmptyStackException;

/**

* Стек: LIFO = Last Input First Output

*/

public class Stack<T> {

Element top = null;

int size = 0;

/**

* Добавить на вершину стека

*

* @param v значение

*/

public void push(T v) {

// TODO: реализовать

Element current = new Element(v);

if (top == null) {

current.next = null;

}

current.next = top;

top = current;

size ++;

}

/**

* Получить значение с вершины

*

* @return значение

*/

public T pop() throws EmptyStackException {

// TODO: реализовать

if (top == null) {

throw new EmptyStackException();

}

Element current = top;

top = top.next;

size--;

return current.value;

}

/**

* Элемент стека

*/

class Element {

T value;

Element next;

public Element(T value) {

this.value = value;

}

}

}