java-design-patterns/memento/src/main/java/com/iluwatar/App.java

package com.iluwatar;

import java.util.Stack;

/**
 * 
 * Memento pattern is for storing and restoring object
 * state. The object (Star) gives out a "memento" 
 * (StarMemento) that contains the state of the object. 
 * Later on the memento can be set back to the object 
 * restoring the state.
 *
 */
public class App 
{
    public static void main( String[] args )
    {
    	Stack<StarMemento> states = new Stack<>();
    	
    	Star star = new Star(StarType.SUN, 10000000, 500000);
    	System.out.println(star);
    	states.add(star.getMemento());
    	star.timePasses();
    	System.out.println(star);
    	states.add(star.getMemento());
    	star.timePasses();
    	System.out.println(star);
    	states.add(star.getMemento());
    	star.timePasses();
    	System.out.println(star);
    	states.add(star.getMemento());
    	star.timePasses();
    	System.out.println(star);
    	while (states.size() > 0) {
    		star.setMemento(states.pop());
        	System.out.println(star);
    	}
    }
}