PersonRelationship.java

    // 將每個相同 Relationship 集中存入到 ArrayList 中，因為一個 Node 可能會有多個關係
    @Relationship(type="CRUSH_ON")
    ArrayList<Crush_On> crush_Ons = new ArrayList<Crush_On>();

    @Relationship(type="HATE")
    ArrayList<Hate> hates = new ArrayList<Hate>();

    @Relationship(type="LIKE")
    ArrayList<Like> likes = new ArrayList<Like>();

    public void addCrushOnRelationship(Person personA, Person personB) {
        Crush_On crush_On = new Crush_On(personA, personB);
        crush_Ons.add(crush_On);
    }

    public void addHateRelationship(Person personA, Person personB) {
        Hate hate = new Hate(personA, personB);
        hates.add(hate);
    }

    public void addLikeRelationship(Person personA, Person personB) {
        Like like = new Like(personA, personB);
        likes.add(like);
    }