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In this video, we'll create the bank class, so we'll start by setting up inside Bank Java and the

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bank is going to be in charge of managing accounts and transactions.

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So here I'll create an array list.

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Type accounts called accounts, and I'll create another ArrayList.

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Not a ray array list of type transaction.

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Called transactions.

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Now we'll add a constructor that receives no parameters, public bank.

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And here we can initialize the area list.

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This accounts is equal to a new object of the ArrayList class.

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That can store account objects.

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Seems like going after import accounts, OK?

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Then we'll set this that transactions equal to a new object of the ArrayList class that can store transaction

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objects.

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OK, now we need methods that we can use to add account objects to the account surrealist and transaction

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object to the transactions ArrayList.

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We're going to start with ad account.

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So we'll see public void ad accounts.

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This method receives an account object.

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And to the Arab, the state accounts, we're going to add a new copy of the account object.

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But wait, a second account is an abstract class.

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So it doesn't matter if this is a checking savings or loan object.

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We can't create a new account object.

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And that's why we need a clone method, a clone method.

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What it does is it returns a copy of the object that calls it so inside account counter Java.

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We're going to force.

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We're going to force every child the class to override Clone, so we'll say public abstract account

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clone.

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OK.

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And now back here, we can say this state accounts don't add account cyclone.

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And what that's going to do is return a copy of the object that calls it.

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So if this object is checking, it's going to call the clone method from the checking class.

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If this object is savings, it's going to call the clone method from the savings class.

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If this object is loan, it's going to call the clone method wherever it is from the loan class.

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And ultimately, Clone will return a copy of that object.

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But right now, we still have to override the clone methods and each child.

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So we'll start with checking.

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I like to define my clone method right after the copy constructor.

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So here I'll override Clone.

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OK, now inside Clone, we're going to create a new checking object.

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And the object we're creating, it's going to get all of its values from the current object that's calling

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this method, which would be this.

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We'll do the same thing inside savings.

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We'll put a clone method right after the copy constructor in here, I will say return new savings.

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This.

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Put a clone method inside Lone.

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Return a new loan object that's going to get all of its values from the current object, that's calling

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this method.

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All right, now, we're going to test our clone methods, so go back to the article and copy over these

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objects inside mean we can remove the following?

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We don't need any more.

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An ad for break points.

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We're getting a bunch of errors.

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Not sure why.

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Oh, we got to import the account class.

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OK.

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Let's visualize the runtime.

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Here it creates a new object of the chucking class.

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And now in this line, Clone is supposed to return a copy of this object.

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How does it do it?

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Well, let's step inside.

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So Clone returns a new checking object passing in the current object as the source the copy values from.

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So ultimately, that's going to call the copy constructor.

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OK.

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So that new object we just created that became the current object and the one that originally called

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this method, that is now the source object that we're copying values from.

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Here, the copper constructor is updating its ID, its name and its balance.

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And now Clone returns a new copy of that object.

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Perfect.

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Same thing for savings.

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This one is pretty simple, we're just creating a new savings object, passing in three values into

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the constructor.

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Nothing interesting here, but here Savings Cyclone Clone is returning a new copy of the object that

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calls it so we'll step inside.

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Clone creates a new savings object, passing in the current object as the source the copy values from.

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So ultimately, this is calling the copy constructor.

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The object we just created becomes the current object, and the object that originally called the clone

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method becomes the source object to copy values from.

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And here we're copying every value from the source object into the current one.

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Clone returns the new object.

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And we're good.