Pila en Java - WordPress.com

package pila;
import java.io.*;
public class pila{
public static BufferedReader entrada = new BufferedReader(new
InputStreamReader(System.in));
public static final int MAX_LENGTH = 5;
public static String Pila[] = new String[MAX_LENGTH];
public static int cima = -1;
public static void main(String args[])throws IOException{
Menu();
}
public static void Menu()throws IOException{
System.out.println("\n\n\t\t\t=========Menu Manejo Pila=============");
System.out.println("\t\t\t=
=");
System.out.println("\t\t\t= 1- Insertar elemento
=");
System.out.println("\t\t\t= 2- Eliminar elemento
=");
System.out.println("\t\t\t= 3- Buscar elemento
=");
System.out.println("\t\t\t= 4- Imprimir pila
=");
System.out.println("\t\t\t= 5- Actualizar valor en pila
=");
System.out.println("\t\t\t= 6- Salir
=");
System.out.println("\t\t\t======================================");
System.out.print("\t\t\tOpcion: ");
int op = Integer.parseInt(entrada.readLine());
Opciones(op);
}
public static void Opciones(int op)throws IOException{
switch(op){
case 1: Insertar();
break;
case 2: Eliminar();
break;
case 3: Buscar();
break;
case 4: Imprimir();
break;
case 5: Actualizar();
break;
case 6: System.exit(1);
break;
default:Menu();
break;
}
}
public static void Insertar()throws IOException{
System.out.print("\nDigite algo para la pila: ");
String dato = entrada.readLine();
Crear(dato);
}
public static void Crear(String dato)throws IOException{
if ((Pila.length-1)==cima){
System.out.println("Capacidad de la pila al limite\n\n\n");
Imprimir();
}else{
++cima;
}
Agregar(dato);
}
public static void Agregar(String dato)throws IOException{
Pila[cima]=dato;
Menu();
}
public static void Imprimir()throws IOException{
for(int i=Pila.length-1;i>=0;i--){
System.out.println(Pila[i]);
}
Menu();
}
public static void Eliminar()throws IOException{
if(cima== -1){
System.out.println("\n\n\nNo se puede eliminar, pila vacia !!!" );
}else{
Pila[cima] = null;
--cima;
}
Menu();
}
public static void Buscar()throws IOException{
System.out.println("\n\n\nDigite la cadena a buscar: ");
String cad = entrada.readLine();
for(int i=0;i<Pila.length-1;i++){
if(cad.equals(Pila[i])){
System.out.println("Elemento encontrado,posicion "+i);
break;
}else{
System.out.println("Elemento no encontrado :(");
}
}
Menu();
}
public static void Actualizar()throws IOException{
System.out.print("Digite el nombre del valor que desea actualizar: ");
String actual = entrada.readLine();
System.out.print("Digite el nombre del nuevo valor: ");
String nuevo = entrada.readLine();
for(int i=0;i<Pila.length-1;i++){
if(actual.equals(Pila[i])){
Pila[i]=nuevo;
break;
}else{
System.out.println("Elemento no encontrado :(");
}
}
Menu();
}
}