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Pila.java
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Pila.java
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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author abel
*/
import java.io.Serializable;
import java.util.Enumeration;
public class Pila implements Serializable{
Nodo1 ultimo;
int total;
public Pila(){ total=0; }
public boolean vacia(){return (total==0);}
public int total(){return total;}
public void push(Object x){
if (vacia()) ultimo=new Nodo1(x,null);
else ultimo=new Nodo1(x,ultimo);
total++;
}
public Object tope() throws Exception{
if (!vacia()) {return ultimo.valor;}
else throw new Exception("pila Vacia");
}
public void pop() throws Exception{
if (!vacia()) {ultimo=ultimo.enlace;}
else throw new Exception("Cola Vacia");
total--;
}
}