82 lines
1.7 KiB
Java
82 lines
1.7 KiB
Java
package stack;
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import exceptions.EmptyStackException;
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import stack.utility.Node;
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/**
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* Created with MONSTER.
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* User: xgiovio
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* Date: 05/03/14
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* Time: 0.12
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*/
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//Copyright (c) 2003 Brown University, Providence, RI
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//Additional modifications and methods by xgiovio
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public class NodeStack<E> implements Stack<E> {
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@Override
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public void push(E element) {
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Node<E> temp = new Node<E>(element,stack);
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stack = temp;
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++number_of_elements;
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}
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@Override
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public E top() throws EmptyStackException {
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if (isEmpty())
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throw new EmptyStackException();
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return stack.getElement();
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}
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@Override
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public E pop() throws EmptyStackException {
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Node<E> to_return;
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if (isEmpty()) {
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throw new EmptyStackException();
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}else{
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to_return = stack;
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stack = stack.getNext();
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--number_of_elements;
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return to_return.getElement();
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}
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}
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@Override
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public boolean isEmpty() {
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if (size() < 1)
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return true;
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return false;
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}
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@Override
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public int size() {
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return number_of_elements;
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}
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@Override
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public String toString() {
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String to_return = "";
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to_return = to_return + "[";
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for ( Node<E> temp = stack; temp != null ; temp = temp.getNext()){
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if ( temp.getNext() == null){
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to_return+=(temp.getElement().toString());
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}else{
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to_return+=( temp.getElement().toString() + ",");
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}
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}
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to_return = to_return + "]";
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return to_return;
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}
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private Node<E> stack = null;
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private int number_of_elements = 0;
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}
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