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Let's get started with our project implementation we'll begin with creating entities which correspond

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to database tables.

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Let's create a new project that's named after leo.

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So we have two projects now one is for the demo and the other is for the real project which is trillion

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.

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Now let's just go ahead and create a new package

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.

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So it's called camarade semantics squared are truly ordered entities and we will have all our entities

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within this package.

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So let's create the user entity so that the user class.

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So just going to new

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Unix are some instance variables.

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First is the ID field.

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I will soon explain why Id feel has this type long instead of.

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And let's add all other variables.

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Last word

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last name.

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Last name.

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Let's have gender roles in.

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It's also include a user type.

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So this is like a screen and we will also discuss it and embed.

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So we how all these instance variables to begin with.

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So let's just go ahead and create getters and setters.

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So let's just go here and do source and it's just our bhajan read them.

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So that's how you come here and select all.

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And let's head.

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OK.

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Now we how all our getters and setters let's just do a control shift.

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Just to make sure that everything is formatted right.

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So that's the new class and all getters and setters are not created so let's just discuss a little bit

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about our ID field.

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So the available time for ID field is long instead of.

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And the reason for this is in the database we mean how millions of users.

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So this malady that I play and may not be able to represent all these users there is a whole range of

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and may not be large enough to represent all users.

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So using a larger data type like long is definitely preferred now coming to user pipe freed.

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It's basically a McAfee that is it identifies a user as either a regular user or some kind of a staff

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member like editor or chief editor.

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You may recall one of the effective doll items item 20 which said preferred class hierarchies but not

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others.

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So in this case we are violating that advice that is we are not maintaining separate classes for staff

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members like editor and chief editor.

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This also means that if we're looking at database tables we would have one table card user and that's

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about it.

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And it would have a column called user type although we are violating that advice from effective Java

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.

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It is fine in this case and there are a couple of reasons for this.

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The main reason is we are treating this product as a web application.

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And as mentioned earlier some of the implementation would be done differently from what was discussed

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initially while introducing the concepts.

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For example probably a probably new and rigid Proview type of methods will be part of some managers

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as opposed to creating a class like editor and including these methods as part of them as we discussed

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.

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Well my learning inheritance Another reason is except for some additional privileges that staff members

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have like approving a review or making a bookmark marking a bookmark as kid friendly.

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They don't seem to have any additional unique features compared to a regular user that is there differ

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only in user type value and all other fields are common to regular user and a staff member.

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Next we will write bookmark classes and did it make sense to maintain separate classes for the different

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bookmark types.

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That is we would have a class hierarchy and not get back to us individual bookmark types like movie

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and book have of that are unique to them.

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In fact we used book market book and movie as an example to illustrate why we should use class hierarchies

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are not classes.

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While discussing that particular effect of Daleiden so it makes sense to have separate classes and even

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indeed as we would have separate tables for movie book and bing.

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OK.

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So let's just go ahead and Corno it bookmarklet across us now.

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OK so we are creating bookmark is now.

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OK let's just create the bookmark class in the same package

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not it's create three variables here

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ID for you which is wrong as in the case of user class

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.

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So by do on the last one is profile you are in.

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So once again let's create getters and setters select all

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control shift have.

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So that's the bookmark class.

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So later we'll be making this an abstract class as we discussed in our lessons earlier.

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That's because we want to introduce the kid friendly related methods and for that we need to make this

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move more process abstract.

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So we'll do that later.

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Next let's add the movie class movie class.

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We're extending the book Class this soon to me just say finish.

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Now let's add this extends bookmark.

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Save it now that's ired.

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Some instance variables

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say the first one is really easy either so.

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And the more we the ear when the movies are released.

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So it's it would be in type.

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Next letter I cast so cast you how money to put our names.

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So how does a string already

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Next let's our directors.

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So once again you mean how more than one director.

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So let's go with string theory.

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Next let's go to John Johnny.

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You can Howard as a string.

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Finally let's I'd reading.

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Let's call it as I am rating just in gets If you don't know what I'm D-B is I'm D-B has website related

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to movies and you can find ratings of movies over there.

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So let's just have that reading as type as an honorable and once again or two generic gendered getters

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and setters all.

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So that's the movie and goodie.

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Let's go had an our book and now

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book also extends book mark.

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You know that now let's ired publication either which can be and

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I the publishers string

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.

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Now let's add authors since can have more than one author Bill Hobert does a string.

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Next.

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John Ray.

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Now let's also have a rating for book.

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Just like for a movie let's call it as Amazon rating so we will get the rating from Amazon.

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Let's just assume that we have the rating from Amazon.

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So once again it would be double counted as Amazon reading because there might be a separate wording

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just within Trejos system also.

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So in its name and let's keep it as clear as possible.

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OK so that's a book.

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Now let's create

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a weblink

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which also extends bookmark

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and Webling to just how only two variables you Orlan host both of them strings

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.

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So that over blank glass now.

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Good friendly status.

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There's a fee for that.

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And that way will later.

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Finally let's create a user bookmark entity which would maintain the relationship between user and bookmark

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.

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That is if a user bookmarks a particular bookmark then that information is stored in this class.

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So if we have a database then there will be a separate table made in just for this entity.

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OK so there will be a table for user bookmark entity.

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So let's just go ahead and create the user bookmark class

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.

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So it's just an independent class not extending any other class.

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So it could have only two variables private user user.

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And we also need a bookmark

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is it after the user was the last one holes after bookmark

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so that the user bookmark last.

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I need food maintain the relationship between user and a bookmark.

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So those are the entity classes that we have.

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And next most likely we will implement the managed process