Tweet.java

class Tweet extends RealmObject {
  String text;
  Date createAt;
  String userName;
  
  public Tweet(){}
  public Tweet(String text, Date createAt, String userName){
  	this.text = text;
  	this.createAt = createAt;
  	this.userName = userName;
  }
}

class Tweet implements Content {
  String text;
  Date createAt;
  String userName;
  // RealmTweet extends RealmObject
  public Tweet(RealmTweet obj){
  	this.text = obj.getText();
  	this.createAt = obj.getCreateAt();
  	this.userName = obj.getUserName();
  }
}