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Merge pull request mouredev#6934 from Josegs95/main
#7, #8 y #9 - Java
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‎Roadmap/07 - PILAS Y COLAS/java/Josegs95.java

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import java.util.*;
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public class Josegs95 {
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public static void main(String[] args) {
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//Pilas. En java existe una clase que representa una pila, la clase Stack.
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Stack<String> bag = new Stack<>();
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bag.push("Bola roja"); //Sirve para añadir un elemento al final de la pila
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bag.push("Bola negra");
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bag.push("Bola azul");
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System.out.println("La pila: " + bag); //Out: 'La pila: [Bola roja, Bola negra, Bola azul]'
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bag.pop(); //Sirve para sacar el último elemento de la pila
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System.out.println("La pila: " + bag); //Out: 'La pila: [Bola roja, Bola negra]'
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//Implementación de pila a través de un arrayList
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List<String> stack = new ArrayList<>();
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stack.add("Elemento 1");
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stack.add("Elemento 2");
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stack.add("Elemento 3");
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System.out.println("Mi stack: " + stack); //Out: 'Mi stack: [Elemento 1, Elemento 2, Elemento 3]'
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stack.remove(stack.size() - 1); //Borra y devuelve el último elemento, como si fuera una pila
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System.out.println("Mi stack: " + stack); //Out: 'Mi stack: [Elemento 1, Elemento 2]'
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//Colas. En java existe una clase que representa una pila, la clase Queue.
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Queue<String> processes = new LinkedList<>();
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processes.offer("Process 1"); //Añade un elemento
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processes.offer("Process 2");
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processes.offer("Process 3");
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System.out.println("La cola: " + processes); //Out: 'La cola: [Process 1, Process 2, Process 3]'
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processes.poll(); //Borra el primer elemento
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System.out.println("La cola: " + processes); //Out: 'La cola: [Process 2, Process 3]'
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//Implementación de cola a través de un arrayList
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List<String> queue = new ArrayList<>();
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queue.add("Elemento 1");
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queue.add("Elemento 2");
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queue.add("Elemento 3");
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System.out.println("Mi queue: " + queue); //Out: 'Mi queue: [Elemento 1, Elemento 2, Elemento 3]'
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queue.remove(0); //Borra y devuelve el primer elemento, como si fuera una cola
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System.out.println("Mi queue: " + queue); //Out: 'Mi queue: [Elemento 1, Elemento 2]'
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//Reto
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System.out.println("\n");
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retoFinalPila();
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retoFinalCola();
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}
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static Scanner sc;
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public static void retoFinalPila(){
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sc = new Scanner(System.in);
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int sitesSize;
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List<String> sites = new ArrayList<>();
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List<String> cachedSites = new ArrayList<>();
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sites.add("Inicio");
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app: while(true){
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sitesSize = sites.size();
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System.out.println("Página actual: " + sites.get(sites.size() - 1));
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System.out.print("Escribe el nombre de la web, Adelante/Atrás para moverte o Salir: ");
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String reply = sc.nextLine();
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switch (reply.toLowerCase()){
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case "adelante":
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if (cachedSites.size() > 0)
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sites.add(cachedSites.remove(cachedSites.size() - 1));
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break;
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case "atrás", "atras":
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if (sitesSize > 1)
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cachedSites.add(sites.remove(sites.size() - 1));
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break;
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case "salir":
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break app;
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default:
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sites.add(reply);
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cachedSites.removeAll(cachedSites);
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}
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}
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}
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public static void retoFinalCola(){
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sc = new Scanner(System.in);
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List<String> printer = new ArrayList<>();
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app: while(true){
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System.out.println("Documentos para imprimir: " + printer.size());
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System.out.print("Escribe el nombre de un documento, Imprimir o Salir: ");
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String reply = sc.nextLine();
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switch (reply.toLowerCase()){
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case "imprimir":
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if (printer.size() > 0)
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System.out.println("Imprimiendo: " + printer.remove(0));
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break;
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case "salir":
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break app;
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default:
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printer.add(reply);
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}
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}
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}
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}

‎Roadmap/08 - CLASES/java/Josegs95.java

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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.List;
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public class Josegs95 {
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public static void main(String[] args) {
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//Clases
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Persona p1 = new Persona("Jose", 29); //Crea un objeto 'p1' de la clase persona
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Persona p2 = new Persona("María", 27);
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Persona p3 = new Persona("Alberto", 41);
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System.out.println("p1: " + p1); //Out: 'p1: Nombre: Jose, edad: 29 años.'
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System.out.println("p2: " + p2); //Out: 'p2: Nombre: María, edad: 27 años.'
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System.out.println("p3: " + p3); //Out: 'p3: Nombre: Alberto, edad: 41 años.'
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p3.setName("Juan Alberto");
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System.out.println("p3: " + p3); //Out: 'p3: Nombre: Juan Alberto, edad: 41 años.'
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//Reto
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System.out.println("\n");
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retoFinal();
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}
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public static void retoFinal(){
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//Pila
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My_Stack<String> stack = new My_Stack<>();
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System.out.println(stack); //Out: 'Stack: []'
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stack.push("Element 1");
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stack.push("Element 2");
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stack.push("Element 3");
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stack.print(); //Out: '[Element 3] [Element 2] [Element 1]'
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System.out.println(stack); //Out: 'Stack: [Element 1, Element 2, Element 3]'
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System.out.println(stack.pop()); //Out: 'Element 3'
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stack.print(); //Out: '[Element 2] [Element 1]'
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System.out.println(stack); //Out: 'Stack: [Element 1, Element 2]'
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System.out.println("\n\n");
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//Cola
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My_Queue<String> queue = new My_Queue<>();
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System.out.println(queue); //Out: 'Queue: []'
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queue.add("Element 1");
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queue.add("Element 2");
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queue.add("Element 3");
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queue.print(); //Out: '[Element 1] [Element 2] [Element 3]'
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System.out.println(queue); //Out: 'Queue: [Element 1, Element 2, Element 3]'
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System.out.println(queue.poll()); //Out: 'Element 1'
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queue.print(); //Out: '[Element 2] [Element 3]'
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System.out.println(queue); //Out: 'Queue: [Element 2, Element 3]'
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}
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public static class Persona{
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private String name;
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private int age;
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Persona(String name, int age){
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public String toString(){
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return "Nombre: " + name + ", edad: " + age + " años.";
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}
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}
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//Reto
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public static class My_Stack<E>{
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List<E> elements;
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public My_Stack(Collection<E> collection){
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if (collection == null)
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elements = new ArrayList<>();
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else
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elements = new ArrayList<>(collection);
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}
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public My_Stack(){
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this(null);
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}
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public E push(E element){
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elements.add(element);
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return element;
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}
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public E pop(){
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if (size() == 0)
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return null;
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return elements.remove(size() - 1);
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}
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public int size(){
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return elements.size();
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}
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public void print(){
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List<E> cloneList = new ArrayList<>(elements);
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Collections.reverse(cloneList);
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for (E element : cloneList)
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System.out.print("[" + element + "] ");
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System.out.println();
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}
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@Override
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public String toString() {
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return "Stack: " + elements.toString();
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}
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}
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public static class My_Queue<E>{
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List<E> elements;
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public My_Queue(Collection<E> collection){
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if (collection == null)
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elements = new ArrayList<>();
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else
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elements = new ArrayList<>(collection);
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}
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public My_Queue(){
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this(null);
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}
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public E add(E element){
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elements.add(element);
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return element;
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}
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public E poll(){
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if (size() == 0)
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return null;
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return elements.remove(0);
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}
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public int size(){
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return elements.size();
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}
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public void print(){
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for (E element : elements)
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System.out.print("[" + element + "] ");
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System.out.println();
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}
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@Override
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public String toString() {
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return "Queue: " + elements.toString();
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}
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}
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}

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