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Channel: 남궁성의 정석코딩

[자바의 정석 - 기초편] ch11-15~18 Stack과 Queue

[자바의 정석 - 기초편] ch11-15~18 Stack과 Queue

Channel: 남궁성의 정석코딩

자바

자바의정석

java

자바의정석기초편

자바기초

자바기초강의

자바강의

남궁성

자바강좌

java강좌

코딩

00:00:03

Hello, this is Tree Forest. In this lesson, we

00:00:07

will learn about Hyeon-gyeong of the cine dict type and removal of the season liquid type.

00:00:14

Hyeon-gyeong 1 between the cine dict type and the raw type is not desirable. For

00:00:20

example, this is like this.

00:00:23

This is a reference variable of the direct type.

00:00:27

I wrote a reference to the type and

00:00:32

this type is

00:00:34

box

00:00:36

butt 4. I didn't know that.

00:00:41

Why is changing it to a box not matching the type?

00:00:45

It is possible, but now a warning occurs.

00:00:49

On the contrary,

00:00:51

this is a box type. The box is this

00:00:54

type and the requirement is of the type. Box

00:00:59

Object Second 5

00:01:02

Also, the tie didn't fit, so I adjusted the type inside the bottle. It's

00:01:07

fine. Sell the warning here as well.

00:01:10

Like this, it's possible to do a raw pipe and a straw neck type in the hospital, but

00:01:17

now that the wind is blowing,

00:01:20

writing an OST LP is actually in itself.

00:01:24

I came to see that jdk. It has been around since jdk 1.5. Since

00:01:33

then, the wash time for teaching the essence class is not good. Yes, the

00:01:40

box is in

00:01:42

ruins as a class Lux t, so you should not use the box without a type table.

00:01:55

Let's try our first practice.

00:01:59

Example 11 Again, there is a box in the 3rd Street weekly off-duty, so I'll

00:02:05

delete this here. I'm developing martial arts. 9

00:02:09

There's a beep in the box. I'll teach you 5.

00:02:13

And what's in the box?

00:02:16

I'll call it a string. 4 is in it. I'm going to play like this. It's you, but it's called

00:02:25

brothers on the 1st string.

00:02:30

This type is a box, so

00:02:33

there's no warning for the 1st band produced by the box-shaped drum. Gyeongbuk

00:02:37

4 Dongeo appears, and on the contrary,

00:02:40

2nd Arlo Pippi loses the box. Clap the

00:02:44

o type with my string. Yes, like this.

00:02:48

I will convert it.

00:02:51

It is possible. What this means is that the

00:02:55

box steam type

00:02:58

has been changed. Yes, it has been changed to a box. The requirement is to

00:03:04

change the box to

00:03:26

It's not very brown Kaz. It's possible, but in

00:03:31

fact, it's possible. This means the shape is 1 in New Boxing. It's

00:03:47

possible to point to an object in the Ichi neck type string with that primitive type.

00:03:52

Even if it's originally white,

00:03:55

yes 2 is preferable. However, it is

00:03:59

possible to use the wash type without using the request. What this means is that the

00:04:03

place is now like this. This has been omitted.

00:04:09

But what happens if you do this? 2.8 Please

00:04:14

give me a hint. 100 This is

00:04:17

over 100. This warning appears, but it is not an error.

00:04:23

Now, this is a box string box, and the interior is used in it. A

00:04:29

warning appears here, but it is not an error. Why is this reference variable said to be a primitive type? It is not

00:04:36

here. The involved type is

00:04:39

all included when

00:04:42

we proceed. What happens if I exceed the string?

00:04:49

Ah, it changed to an error right away. The warning is

00:04:52

given like this. Yes,

00:04:56

so because of this, you can't mix it now, and you ca

00:04:59

n't mix the raw Thai wave and the essence tab, and you definitely

00:05:05

encounter an error like this manually, but it

00:05:08

only gives a warning, but you still need to use it.

00:05:15

Please make sure to use the knowledge base instead of mixing raw types like this. I will tell you that it is possible.

00:05:24

Come back again. After that,

00:05:27

[Music]

00:05:29

2 different types are used, but

00:05:32

type conversion between 4 Centipede Recta apps is not possible.

00:05:36

Yes, both are not possible.

00:05:39

That's why this sentence doesn't work. When I use this clap

00:05:43

string

00:05:46

bei, 4 5 5

00:05:51

box

00:05:53

object le, why doesn't this work? Because the

00:05:55

name

00:05:59

type wall type doesn't match, because it's not a type, you

00:06:08

can match it with the type conversion box string like this. If so,

00:06:12

this means that the error is just a type conversion.

00:06:17

[Music]

00:06:19

So, you can view this in the same context.

00:06:24

6 Object Box Office 3D Box is not declared like this.

00:06:32

Yes, and the

00:06:36

essence type with the wild card used. Type conversion is possible.

00:06:39

Yes, I'll delete it. As

00:06:45

I just said, this box string is

00:06:50

referenced in the box object type. If it points to it, an error will be given.

00:06:54

This will cause a revolution. No, no, will appear. Yes, so, and this

00:06:59

is different, but

00:07:02

this box string is 2 wild Card Systems Converting the type to an object is

00:07:09

ok. We saw that this is possible. We do

00:07:14

n't know about wildcards.

00:07:17

Objects.

00:07:26

Then, the string is a descendant of the object, so it's ok.

00:07:31

But in fact, this is omitted, so we omit it. The

00:07:35

type is different here, too. This is a little box string and

00:07:40

this is a box wild card

00:08:03

Yes, it should be entered, but that was omitted. So,

00:08:09

all 2-box strings are convertible.

00:08:13

A Wildcard Extend Object, meaning that the type can be converted to a changed scale

00:08:19

lesion 1.

00:08:22

Open your eyes as much as possible. This sentence itself is a big

00:08:27

color, so just like you learned in the journal.

00:08:30

Here's an example of the Wild Extend program, and

00:08:34

Apple both said OK by using the reference variable.

00:08:39

2 Both of them are convertible, so

00:08:43

Apple is using Box

00:08:47

x10

00:08:50

Pro on its own.

00:09:01

Yo

00:09:04

Bor box

00:09:07

object,

00:09:12

Fururup box,

00:09:15

okay, this works. Well, the members also have a floating

00:09:20

3rd profit and loss proposal, so it can't work. What happens in May? I have to do it in

00:09:26

Porto, so it does

00:09:30

n't work because I didn't do anything. It has to be done like this,

00:09:34

right? And Plus,

00:09:42

Apple, yes, you have to do it like this.

00:09:45

Pangpang. This is

00:09:49

just the name of the reference variable.

00:09:52

Let's make it an anvil f box, and now we'll do the requirements. It's an

00:09:56

Apple box, so yes, it's normal for it to match like that.

00:10:04

But I've seen all of this, and Wild

00:10:08

Street also used it.

00:10:10

World Car The E-sten has to be brute. This is the

00:10:16

same.

00:10:21

This story is omitted here and means something like this.

00:10:25

Yes, type conversion 2.

00:10:33

How about understanding and understanding?

00:10:45

So what happens then? The type needs to be

00:10:48

converted. It needs to be changed.

00:10:54

So originally, it has to be done like this. It has to be entered like this. Yes, but

00:11:02

this has been omitted. It has been omitted. This has been omitted. Originally, this has to be entered. Yes. Why is the type not accepted? The types, such as the amount of the assignment operator on both sides, do

00:11:08

not match. So this has to be included. It's a

00:11:13

WonLan network, but now omission is allowed, so I omitted it.

00:11:21

On the contrary, can I also do it?

00:11:24

On the contrary, what is it? I

00:11:29

don't know what this is right now. I did it here.

00:11:35

Box Apple 2.

00:11:37

I didn't know this.

00:11:41

Pro Box or Cardo x10 I

00:11:45

changed my clothes. Yes, the opposite. How can I

00:11:54

change it like this?

00:11:58

4 This is why. Should I do this?

00:12:03

Should I do it? Let's give

00:12:06

it a try. How can I do it?

00:12:12

Proof box

00:12:33

With this, it does

00:12:40

n't go out. There is a warning, but there is no error.

00:12:47

Dong-gu

00:12:52

4 will come.

00:12:55

Since box f is a wild card, this stamp loop c can be used as a taped black box,

00:13:01

and vice versa. Yes, a

00:13:08

warning is generated for the corner,

00:13:12

because it is gathered. Is there a wild card in it? The

00:13:16

type is not correct, so I'm trying

00:13:19

to change it to a clear five, so I need this.

00:13:26

Well, you don't need to worry too much about it. You can always add something in the type conversion, but you

00:13:33

can omit something that matches it. I don't really pay attention to that. Everyone, memorize it

00:13:38

and don't write anything. Ugh, please

00:13:40

use the type conversion. You can write it.

00:13:43

Yes, I thought it was possible to interpret without errors, but the

00:13:47

error was staged. You think so, you

00:13:51

know. Yes,

00:13:53

this is possible again. Yes, I know that it is possible. I already have

00:13:59

liver

00:14:01

cancer. You know it, and vice versa.

00:14:07

Yes, you know. I'll skip it this time. You have to use Buddhism.

00:14:12

For now, you just need to know that it's possible.

00:14:16

But yes,

00:14:21

now we'll learn about removing the type.

00:14:27

The compiler removes the essence type.

00:14:31

Throw it away. What is the necktie? It only exists until the computer is sold. Why is the compiler

00:14:38

trying to remove it? Are you

00:14:40

talking about the table?

00:14:44

How do you change the original code?

00:14:49

Why is the compiler changing it like this?

00:14:52

Remove all the director's mouths. Put the injured face and the appropriate par mouth in the

00:14:59

original. What do you think of Nuri's turn? Instead of object, type

00:15:04

toilet t is used.

00:15:08

But if you

00:15:11

compile it, it will only be Tigger Mall. The

00:15:15

object will go in. Parsi is the

00:15:17

original. The reason is

00:15:22

because of backward compatibility. Sub is completed.

00:15:30

What is Hwawoo's complaint? It

00:15:35

has been 16 years since jdk 1.5 was released to make it compatible. 11

00:15:42

4 It

00:15:45

has been 16 years since it came out in 2004, but now that this has been released, the

00:15:56

decision has been made to remove the type to make it run without problems by extending the previous version 1.5. If you do

00:16:01

that, there is no difference from before x was introduced.

00:16:08

So, x only exists at compile time. This

00:16:14

Java attaches great importance to backward compatibility, and

00:16:19

backward compatibility has some advantages, bringing stability. I mean,

00:16:25

Java is still being used a lot, and there are too many 0s being used, so I

00:16:32

can't help but look at this backward compatibility.

00:16:37

And here again, value is relayed, and

00:16:41

this is also a characteristic of Java.

00:16:43

So Java is now stuck with backward compatibility.

00:16:48

There are many parts that have not been developed quickly.

00:16:50

There are many more advantages if this essence type is not removed. For

00:16:55

example, I do not do c shop. You

00:17:13

can check the true type of the degree, and there

00:17:17

are various advantages such as performance issues.

00:17:22

But Java doesn't do it because it doesn't know about it, but it

00:17:28

places more value on backward compatibility. The city's business focuses on performance rather than backward compatibility.

00:17:33

I will pay more attention to the development side, and

00:17:38

as Java is used a lot in Java, it will have more advantages in backward compatibility. I have a

00:17:44

9 o'clock job in Sapa before, and my aunt is doing it,

00:17:50

but I wish I didn't do it. In fact, technically, almost everyone is doing it. They

00:17:56

are all in very high positions, but each language has its pros and cons depending on which side you put more emphasis on.

00:18:02

I've been holding it for a long time, but I don't even say that Saba is the best. I have

00:18:10

no idea about other languages, and Oden is the developer and the

00:18:14

language we need. I just choose to use it. Well, I

00:18:18

can do it as a hobby if I want to, but no matter how much I use it, I have no choice but to do it because the company will catch me. Is

00:18:23

that good or bad? We

00:18:29

don't need to talk about this. Especially the

00:18:31

copper solid color. Why is this happening? It's like this. What's the best in the shop?

00:18:36

Java is the best. I think it's a bit of a problem to say that. Yes, but

00:18:40

among the languages that are widely used, they all have their pros and cons and you just

00:18:45

have to choose and use them accordingly. Which is the best? 4

00:18:49

We developers are developers, and I, a Java developer, have been conscious of this for a lifetime.

00:18:55

I don't think that's what we've been used to. Just choose the language you need according to the situation and use it. I

00:19:01

think it's an unnecessary fight to argue about which is best.

00:19:06

Anyway, here it is. I'll explain it a little more.

00:19:09

Yes, if you

00:19:11

jump in and use this, it will

00:19:16

change to a mole if it's wrong. It will change to this object. Turn it back to its original state. This

00:19:22

would have become an object.

00:19:23

Yes,

00:19:24

but I don't know where I am right now. I used Yeti's Stenz Plus.

00:19:30

It's tnt, but now it's Prou 3rd. It has to be a hand. This is ours.

00:19:35

So this is not an object, but secretly outside.

00:19:37

Yes, it changes to Bruce.

00:19:40

Basically, the type t changes back to an object.

00:19:45

But in this limited case, it changes to a mall. It changes to a limited type, not 500 t.

00:19:53

So, Marado Countryside then.

00:19:57

Well, what's the advantage of Bells? It's that you can omit the type change. That's why you

00:20:01

can't tell here.

00:20:02

The type conversion is omitted. Ugh, it's

00:20:05

not the average to some type t. But this type secretly changes.

00:20:12

Yes, it changes to a conservative. It

00:20:16

changes like this, but when that happens. Since the

00:20:20

semicircle tile is now an object,

00:20:23

type conversion is necessary. Just because we think of garlic as a type does not mean that we do not need to do type conversion. Please

00:20:36

add a compiler. It will be convenient for us instead. We need a conversion. So, add the compiler and the original like this. Yes

00:20:43

and o. Even if a wild card is included, it

00:20:47

changes appropriately. Yes,

00:20:58

what can come in here can be made by a professional. Yes, it is assumed that there is something in the box. Pull up the horn and see that there is money in it.

00:21:02

So delete this and

00:21:05

yes, you know here. It's a

00:21:08

charity. What's in here?

00:21:11

Lotto

00:21:14

can be like this because the descendant heard. Yes, you

00:21:19

can use pro flo. Let's see. Because the descendant is

00:21:24

there. But here, the wildcard disappears, so you can't use it like that. The

00:21:28

code becomes a lot more complicated, and uh, type conversion. You need this. Do you

00:21:38

know if this is an imitation of the type you fell in love with? Uh, the

00:21:41

most important thing is that the j ha b disappears at compile time. So when we

00:21:50

introduced jx, we changed the object to a type variable t.

00:21:56

What happens after compiling? Afterwards, in Sword 8 and 9,

00:22:02

Pi test is changed to an object again. It is not necessarily an object, but

00:22:07

is changed to an appropriate type. We thought about changing the type thanks to Genex, but now

00:22:13

the type conversion is added. Just

00:22:16

know that.

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ch12-15,16 지네릭형변환, 지네릭 타입의 제거에 대한 강의입니다. http://www.codechobo.com/

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