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Before we start, did you try solving the workbook yourself?

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If not, please click the link in the resources folder and follow the instructions for this workbook.

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Welcome to Workbook 7.6.

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Task one is to initialize the passport whenever a new object is created so we can say this passport

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is equal to a new array that can hold three elements.

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Task two is to add the getter get passport.

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So here we can say public.

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We're going to be returning an array of string values when an object calls.

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Gut passport.

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And we're going to return arrays dot copy of.

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We will return a copy of the passport array and we're going to copy over the full length of the passport

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array.

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And that should be on.

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Task number three is to add this print line function at the end of your main method.

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Simple enough, we just have to fill in the placeholders where necessary at the end.

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So we'll do it here.

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Fix up the spacing.

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So here we call.

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Person name or get name, I should say.

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Here we call.

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Person dot get nationality.

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Fix up the spacing again.

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Here we call.

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Person dot get date of birth.

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Person.

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Don't get seat number.

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And for the passport we need to print, it's two string.

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So arrays dot to string, person, dot, get passport.

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All right.

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Your output should appear as follows.

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Let's go ahead and visualize the runtime.

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I'm only going to put a breakpoint over here because we have visualized the other getters countless

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times before.

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Here, we're creating a new object of the person class.

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And because we are passing in four arguments, it's going to call the constructor that expects to receive

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four parameters.

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Here you can visualize the parameter values.

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This points to the current object that was just created.

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And here we set this name equal to the parameter.

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Here we set this nationality equal to the nationality parameter.

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Here.

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We set this date of birth equal to the date of birth that was passed in.

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And this passport does not require a parameter.

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H is going to be set equal to a new array that can hold three elements, and this seat number will be

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set equal to the seat number that was passed in.

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All right, The constructor is done updating the objects as fields, and at this point the person variable

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stores a reference to the object that we just created.

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We're not dealing with this right now.

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And you'll remember we have a breakpoint at person.

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Get passport.

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So let's just continue to it.

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And so the passport field, ultimately it stores a reference that points to the array.

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We don't want to return the same reference.

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26.

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If we were to say return passport, all it's going to do is return a reference to the same array.

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26.

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But in this case, we're returning a copy of the array.

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So here you can see get passport returns, another reference for 37 to a brand new array.

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But ultimately it's just a copy of this array.

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So null.

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Here.

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We printed all of the fields values, including the passport, which at the moment is just null.

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And so task number four is telling us our code contains a set or set password.

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Notice it doesn't have a parameter inside set passport.

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We set the passport equal to the name, nationality and date of birth fields.

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So here inside of set passport, you can do one of two things.

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You can say Passport at index zero is equal to the name.

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Passport and index one is equal to the nationality and passport at index two is equal to the date of

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birth.

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You could have also done this in a single line.

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It's totally up to you.

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So here you could have just set passport equal to a new string array that stores the name, nationality

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and date of birth.

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But I'm going to stick to what we have over here.

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And now we call the setter if the person gets approved for a passport.

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Otherwise, we just don't do anything.

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So if person got apply for passport is true, we are going to call person dot set passport.

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Okay, let us visualize the runtime.

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Here we create a new object of the person class calling in the constructor that expects to receive four

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values.

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The constructor gets called.

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It receives every single value as a parameter.

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We visualize the parameters over here.

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This point to the current object that was just created, the one that's calling this constructor.

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Here we set this name equal to the name value that we passed in.

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Here we set this nationality equal to the nationality that was passed in date of birth.

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We set passport equal to a new array that can store three elements, and here we set the seat number

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equal to five.

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All right, we're done.

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Initializing our object person stores a reference to that object.

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Here we apply for a passport.

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Let's hope the application returns true.

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It doesn't.

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So you know what?

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Let me just restart the runtime.

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Skip all this, we create a new object again, going inside of apply for passport.

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Does this return true again?

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It does not.

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So let me just skip ahead.

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Finally, now we accept their passport application, which means person not set passport is going to

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get called.

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We step inside of set passport.

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This points to the current object that called set passport.

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At the moment it has a bunch of null values.

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That's fine.

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We're going to set the element at index zero equal to the name.

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We're going to set the element that index one equal to the nationality and the element that index to

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equal to the date of birth.

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All right.

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Looking good.

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So now our person object has been fully updated.

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Their passport was accepted and updated accordingly.

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I'm just going to continue to the next breakpoint, get passport.

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And so in order to protect our field, instead of returning a reference to the same array.

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What we're going to do instead is return a copy of the array.

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So here you can see that the method got passport returns, a brand new reference to a copy of the array.

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And ultimately we're just printing all of the field values and we are golden.

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Upon getting approved for a passport, their passport gets initialized.

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All right.

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And in the event that their passport gets denied, we should get the following values.

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Let's just run it using Java C Main Java.

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Java Main.

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Once again, we get approved.

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Let's just keep running it until we get denied.

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In this case, this never gets called, which means we never update our passport field.

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It stays null and then gets printed.

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I hope you enjoyed this breakpoint session.