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Hi there.

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Welcome back on this is Molinaro.

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So now we are going to do the demo for bonded.

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OK.

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And a new motor car bonded while cars husband are just in the genetics to mock us.

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OK.

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So now let's go ahead and look at the code.

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So we are going to look at this method cardless display.

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We have seen it in the lecture but did we were using bookmark as the upper bone.

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But here it is number so that display at that is a harmless method.

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All it does is displays the elements of the booklets.

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OK that's what we're doing here.

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And the for loop we are adding to the list.

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We are displaying the element each element here.

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So we are using this excellence key what God gives us the flexibility to invoke it with either a list

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of number or list of any type of number like in this tough interger.

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OK so now because the bonus number we can also invoke one of the methods of it directly and we won't

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have any Schuss.

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So this is a harmless scenario and so we need to work cut on the invariant property and this gives us

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that flexibility.

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And this is a producer off the know that extends only produces data.

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So if we try to consume data then we get decomposition.

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You are limited in dentally uses the argument that uses the class level type parameter.

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So because of that we cannot do this.

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Only thing is we can argue we can pass a null value so we can do that.

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Now if I make this super It means that it can consume data.

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OK.

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You know with the uncommon this we won't have the compilation error anymore.

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So that is fine because it is consuming data.

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But here we are getting a compilation error on that because here the pipe is number OK it is fine if

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we pass a list off number but we know that this kind of super It can also be passed is supertype like

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a lost object.

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OK so that element would be object.

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So if we make this object here then we are good.

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But we we should not be come's producing that also could not produce data should only consume data as

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we have seen in that recommendation.

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So we should not be doing that.

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So here are two year back.

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So let me just go ahead and grandis go back.

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So we are looking at twice here once here passing a list on and dejour unwanted stuff.

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So if you run it.

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So its husbanding the end granules and then it is printing the double on use.

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Okay.

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So that's the nice thing.

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And one more thing is the scene Mattel can also be represented and this meant using a genetic method

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.

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Okay here is the genetic method.

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So it can be done in that we set it up as introductory.

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So here this is not a genetic matter it is just a bicarb type only a wild card type is being used because

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there is no type parameter here as we can see.

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But this one it just does the same thing here the type barometer extends a number and we are using a

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list of B and we are still in the aliments and it will give us the exact same book.

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You can try it out later when the thing is here we have a compilation error because this boater duplicate

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methods on thats because it is it at runtime but on time all this GeneDx examination will be will be

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removed.

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So all of this will be to more on both of them are the exact same methods so they are not there it's

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not method overloading were discarded earlier or.

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So I mean just common this out.

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The only thing is you might ask which of the two approaches should be used and that we will see later

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.

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But the main thing is if the type but amygdala is used only once here in the method declaration then

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this is before it but if it is used multiple times let's say once in the return type and once here or

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so only in the multiple times only in the matter parameterless then it would go for a genetic method

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.

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OK.

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Because you can reuse this so there is a dependency between in the in the matter declaration dependency

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across in the method declaration across the method parameters on that it and BYB are just the method

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parameters because it's being reused here.

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So that's why you want to do it but if it is used only once then this is not how but later at the end

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of the lecture we will also look at some brief notes on that.

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So that's not so let's go back to me on Coman this woman to come here.

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So here we are invoking this agregate with you momentarily.

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So basically I could get to be looked at the aggregate regarding the previous wissen.

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So here you're passing the list into list and a list.

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And we are also passing a nominalist which is declared here iron all the elements from both these lists

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are added into the nominalist so we're good at getting it.

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So if we go here to get with consumer on here is the aggregate method which we have seen earlier but

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there we used a genetic Mettler this was from the bottom of the previous demos.

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So we are using most wanted list on list.

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The only thing this year.

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Everything is off seemed.

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But here because.

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Because we are doing it this way we can how we can pass different types of elements.

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So L-1 for anyone we can pass a list of integer.

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And for that we can pass and this stuff double or whatever it is.

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So here it is a generic Mathare as you can see that is a pipe barometer.

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And this is an upper bonded wild card but the ball is either here or the bone is the iron.

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Here we are using.

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We are assuming that the torso we are using is super.

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Here are the stupid Amato's.

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It is excellence.

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Ken here we are adding the elements and do all three costarring L-1 elements than any two elements.

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By looking at all the material.

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So we are consuming data on how super is used here.

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So again I named it as agregate with concealer because if we do not do that then we get a duplicate

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both of them would be deep or duplicate.

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I just named this as aggregate.

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So let's go back and let's just run it around here that is the nominalist.

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So it has all the six elements.

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Now I'm in here you have the same method can also be expressed using genetic markers.

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So most of the methods can be exposed in this way.

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In this case we are using the tree which is this fun for the consumer and even is extending E3 and also

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is extending E3 but E3 is being used only once here.

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So I think this is portable.

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This is preferable about using the wild card.

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Does this approach is profitable.

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I know it is also much more clear because this is the exchange and this is excellence and this is super

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.

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So it is much more crowded also.

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So this is a profitable approach for this because that type element is not being used here is not being

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used more than once here and this is okay.

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So.

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So lets go back.

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So thats what that non-intellectual you also get some commonly used methods from collections.

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Let's look at some of them here.

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So one of them is at Ohlemacher iron.

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We know that at all amateur basically and the elements here in the collection and we're using super

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for that.

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So this is the method from the Collections class.

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So this is the all and we are passing through in Google use here and we are adding them into this other

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list off object.

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Marjorie Howard or it IX's the pipe is in the pipe in Ford is in danger.

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And here we are having the lower Bonner's integer and integer here.

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So that's sort it is so because lower bonus because the lower bar is integer we can pass a collection

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of integer or a collection of object.

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So that's what we are doing we are passing a list of object.

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So basically the the type argument are used is the most specific subtype across the type arguments.

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So this is object indeed on an Dejah.

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So because we are using super head smartly they used the integers as the argument against the pipe argument

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.

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So they use the most specific.

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Now copy as copies from the dhaba here from the second but go to source in this list.

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So copy would copy everything and this and get that image.

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So from the starting from zero to lament it would copy everything and go into the same index positions

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.

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And if this list happens to be a bigger slice then all the remaining elements after the elements are

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copied from here will be retained.

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OK they they will have the same values as this.

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Let's look at the matter here.

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OK so this is super because it's consuming data on sources externes we look at that.

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And once again it's a genetic McChord.

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So we go back Howard on it.

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So you're passing a double list on a list so that type in court isn't up and it's more specifics update

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.

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And here we are just simply printing the last of the copy operation.

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And the third one is that this joint operation which we have also seen.

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So we are passing disjoined both the Los Angeles on the list and it uses an unbonded Why not simply

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print and go to accrue if the if there are no common elements between the two options.

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It's an unwonted.

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Because we really don't care what the pipe is in here and disposed on here.

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In the past.

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So I me run this.

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So here we are after the copy operation all the elements are copied at the beginning.

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But the nominalist also had some double elements here.

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Okay.

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The last three elements.

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So they are retained as it is and they design and operation here as a dining group because one is an

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interest on one is a double list so you cannot have any common elements.

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So that's not and we also to replace Mathare if you recall now for the replacement there I end or just

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a simple replace method which is pretty much like the replace method and the replace all method in the

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collections.

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So all that is doing is go back.

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This is the matter Qurei bliss all this is a generic method but there is also a question here which

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uses the super but replace all book producing and consuming data.

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So it should be like this.

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OK.

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Now let's let's just serialist.

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So this in this list.

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So this is all value on this is the new value and the old values present we need to replace it.

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So let me just move back.

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So here is the list and we are saying or replace all the values of eleven point forty four.

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So there are two instances seven point eleven point five on here on it.

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It is printing again with 44.

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OK Art but replace all the math and I just want to show you that it can also be done in this way like

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using a wildcard type.

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OK with this thing a lot wanted card type but you shouldn't be doing this in this case it is fine because

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you are using only the equals method and the object.

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But if this happens to be something like a bookmark or a number then and if you using some methods specific

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to that lower bone then we can run into cross-current exceptions because it can also be passed a number

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.

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In this case it is fine because we're only using the term object.

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Equals is a matter Klym object.

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But as we said if we are both producing and consuming data then we need to use eques then we need to

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use equal match.

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Here we're producing the data on here using the segment that we are consuming data.

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So that's about that.

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And finally here is yet here I just wanted to show this.

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This is an idealist.

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So this is one way in which our eldest is using it.

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So this is a constructor and an idealist is taking this collection and copies all elements of this collection

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into the audience.

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We are using extents but e is actually the barometer of the cost the cost of that parameter.

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OK.

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So this again.

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So in this case because of that the the number is the class level type parameter.

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OK.

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But we can also pass a list of integer.

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OK a list of indigenes can be passed because here the matter is this extents number right.

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It says excellence member you could be number because a number is being passed as type argument.

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And if it is number which means that we can also invoke this constructor using a collection or number

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or any updates on that's what we are doing here.

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So I bonded wild card is helping us do that.

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So this is just an example.

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So that's about it for now.

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And this court is available in the resources section.

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Let me also just discuss a little bit about how when to use Spight type barometers versus who are you

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carps which we also discussed earlier.

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But you have to look at critically a bit more.

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So let's say there were some sites not okay like we discussed earlier many methods can be declared using

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just wild cards are using generic methods.

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So the question is which of the two approaches should we play for.

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We should go for genetic matter of the same type Hamacher appears multiple times in the method declaration

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but does dependency exist and long pipes off one or more Meklit parameters and are then you can.

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For instance in the automatic Collections class same type but I'm eager It appears more than once.

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Among the parameters.

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So far this genetic matter it is appropriate.

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Similarly here is another method from the collections class.

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She had also the same type parameter appears more than once.

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As part of the method return type and once as part of the motet parameter but of the same type parameter

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is not going great at multiple times then go forward.

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What else is there to Cinematheque which we have seen earlier under-equipped the best dirt using a white

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wildcard as a type parameter would have appeared only once.

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Finally this is a disappointment there from the collections class which we have seen earlier this also

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unbonded wild card is better.

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And this gives book collections can have different types of elements.

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So if we a person using a genetic method B would have to use different parameters put a beating on me

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once in them at the declaration.

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So wildcard is the way to go.

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So that's about it.

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I hope you enjoyed learning about Willcocks.

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It should help you to write better library code.

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Thank you.