Week 5: Class hierarchies/13B. Equals method for class Movie [4 basic chks]

Class 'Movie' is defined in the following program.
Write the 'equals' method to the class using the examples in this page.

2 movies are equal, if ALL ATTRIBUTES have 'equal values'; 
hence, the name, director and length should be equal.




import java.util.Random;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        Movie m = new Movie("Java and Me", "James Javason", 93);       
        System.out.println("Movie: " + m);
        
        Movie m2 = new Movie("Java and Me", "Jane Javander", 93);        
        Movie m3 = new Movie("Java and Me", "James Javason", 94);        
        Movie m4 = new Movie("Python and me", "James Javason", 93);
        Movie m5 = new Movie("Java and Me", "James Javason", 93);
        
        ArrayList<Movie> movies = new ArrayList<>(Arrays.asList(new Movie[] {m2,m3,m4,m5,m,null}));
        Collections.shuffle(movies, r);
        
        movies.stream().forEach(mo -> compare(m, mo));
        
        System.out.println("Comparing to String \"Java and Me\"");
        System.out.println("equals: " + (m.equals("Java and Me")));
        
        
    }
    
    public static void compare(Movie m, Movie m2) {
        System.out.println("Comparing to movie " + m2);
        System.out.println("equals: " + (m.equals(m2)));
    }
}

class Movie {
    private String director;
    private String name;
    int length;
    
    public Movie(String director, String name, int length) {
        this.director = director;
        this.name = name;
        this.length = length;
    }
    
    public String toString() {
        return name + " (" + director + "), " + length + " min.";
    }



    @Override
    public boolean equals(Object m2) {
        // same object
        if (this == m2) {
            return true;
        }

        // not null
        if (m2 == null) {
            return false;
        }

        // not 'Movie' class
        if (m2.getClass() != Movie.class) {
            return false;
        }

        
        // convert into an object
        Movie other = (Movie) m2;
        // same values
        if (this.director.equals(other.director) && this.name.equals(other.name) && this.length == other.length) {
            return true;
        }
        else {
            return false;
        }
    }





}






Movie: James Javason (Java and Me), 93 min.
Comparing to movie James Javason (Python and me), 93 min.
equals: false
Comparing to movie James Javason (Java and Me), 93 min.
equals: true
Comparing to movie Jane Javander (Java and Me), 93 min.
equals: false
Comparing to movie James Javason (Java and Me), 94 min.
equals: false
Comparing to movie null
equals: false
Comparing to movie James Javason (Java and Me), 93 min.
equals: true
Comparing to String "Java and Me"
equals: false