Simple Ciclic Data

gistfile1.java

import tester.Tester;

class Star {
	String name;
	Movie movie;
	Star(String name){
		this.name = name;
	}
	Star(String name, Movie movie){
		this.name = name;
		this.movie = movie;
		this.movie.addStar(this);
	}
	
	public void addMovie(Movie movie){
		this.movie = movie;
	}
}

class Movie {
	String title;
	Star star;
	Movie(String title){
		this.title = title;
	}
	Movie(String title, Star star){
		this.title = title;
		this.star = star;
		this.star.addMovie(this);
	}
	
	public void addStar(Star star){
		this.star = star;
	}
}

class Examples {
	Movie m = new Movie("Harry Potter");
	Star s = new Star("Harry", m);
	
	public boolean testThis(Tester t){
		return t.checkExpect(s.name, "Harry")
		    && t.checkExpect(s.movie, m)
		    && t.checkExpect(m.title, "Harry Potter")
			&& t.checkExpect(m.star, s);	 
	}
	
	Star s2 = new Star("Mike");
	Movie m2 = new Movie("Callout", s2);
	
	public boolean testThis2(Tester t){
		return t.checkExpect(s2.name, "Mike")
		    && t.checkExpect(s2.movie, m2)
		    && t.checkExpect(m2.title, "Callout")
			&& t.checkExpect(m2.star, s2);	 
	}
	
}