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/*
Author: Walter Alleyz
Date: 2022-03-29
Objective: Show the main patterns widely used in the object oriented programming scenario.
Patterns: Strategy, Chain Of Resposability, Template Method, Observer, Adapter, Decorator, Composite, Proxy and Facade.
*/

import java.util.Optional;

class Main {  

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class RevistaInformatica extends Observable {

	private int edicao;

	public void setNovaEdicao(int novaEdicao) {
		this.edicao = novaEdicao;

		setChanged();
		notifyObservers();
	}

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class No {
    protected int chave;
    No esquerdo, direito;
 
    public No(int chave) {
        this.chave = chave;
        esquerdo = null;
        direito = null;
    }
 

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class Numero implements Operador {

    private int numero;

    public Numero(int numero) {
        this.numero = numero;
    }
  
    @Override
    public int interpretar() {

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interface Desconto {
 
    BigDecimal calcular(Pedido pedido);
 
    void setProximo(Desconto proximo);
}

class DescontoPorItens implements Desconto {
        
    private Desconto proximo;

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abstract class Command {
    public Editor editor;
    private String backup;

    Command(Editor editor) {
        this.editor = editor;
    }

    void backup() {
        backup = editor.textField.getText();

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class Editor extends JComponent {
    private Canvas canvas;
    private CompoundShape allShapes = new CompoundShape();
    private History history;

    public Editor() {
        canvas = new Canvas(this);
        history = new History();
    }

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interface ProfileIterator {
    boolean hasNext();

    Profile getNext();

    void reset();
}

class FacebookIterator implements ProfileIterator {
    private Facebook facebook;

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interface Component {
    void setMediator(Mediator mediator);
    String getName();
}

class AddButton extends JButton implements Component {
    private Mediator mediator;

    public AddButton() {
        super("Add");

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abstract class State {
    Player player;

    /**
     * Context passes itself through the state constructor. This may help a
     * state to fetch some useful context data if needed.
     */
    State(Player player) {
        this.player = player;
    }