#60 Wrapper Class in Java

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In this lecture we are discussing about wrapper class:
if you want to store integer value you store in int
java provide primitive data type
thats why java is 99.9 % object oriented programming
primitive data types helps us to improve the performance
but certain feature are work only when we work with objects
for collection framework -- we need non primitive type data as input
byte -Byte
int - Integer
long -Long
char- Character
double -Double
float -Float
boolean -Boolean
Boxing:It is manual method to convert primitive type data into non-primitive type .
e.g
int num=7;
Integer num1=new Integer(8); //boxing
UnBoxing: It is manual method to convert non-primitive data type to primitive type.
e.g
int num2=num1.intValue(); //unboxing
AutoBoxing:It is automatic conversion of primitive type data into non-primitive data type.
int num3=5;
Integer num4=num3; //autoboxing
AutoUnBoxing:It is automatic conversion of non primitive type data into primitive data type.
int num5=num4; //autounboxing
int num=7;
how to store data as Object
Integer num1=new Integer(8); //this syntax is depreciated
Integer num1=Integer.valueOf(8); //Now we use this syntax
Integer num1=8; //autoboxing
int num2=num1.intValue();//unboxing
int num3=num1; //autounboxing
--convert string into int type using parseInt
String str="12";
int num4=Integer.parseInt(str);
--Convert number into String
String str1=Integer.toString(23); //convert number into string
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[@Sedeerah]

This is gold. Thank you!

[@Wisdomizer]

It can help us understand, the important question in the interview - Difference between primitive type variable and a wrapper class for ex. int and Integer.

[@user-wz8vw4bl3r]

so, how can you differentiate in one single line?

[@zomssingh8744]

​@@user-wz8vw4bl3ra class who wrap primitives into objects form Or Predefined class of java which contains primitive data type

[@gowthamivallabhadasu2523]

@@user-wz8vw4bl3r As per my understanding, if you want to store simple values, use primitive. But when you want to leverage OOPS or take advantage of OOPS, use wrapper classes. The memory usage of primitive is smaller. for example int is 4 bytes. but Integer is an object so it occupies some good amount of space in the heap memory. You must use Wrapper classes when working with collections.

[@nikhilagrawal9217]

Thank you this is very helpful for the interview.

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hello sir, i need to learn spring from scratch, then go to spring boot, what is the path?

[@zr0724]

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ofcourse

[@anonymous.reddy0]

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[@bijenadhikari]

My one and only programming teacher in the world. Love from Nepal

[@PipsMastery]

Sir how did you get that Integer file containing all the infomartion about it on vs code?

[@yashuy3279]

Thank you, Sir.

[@sravanit2002]

Thank you it's very helpful

[@ahmadabadi_jainil]

Thank you so much sir ❤❤

[@ritwikdurga3855]

Sir are these tutorials different from the ones previously(3yrs ago) tutorial playlist bcuz I am watching them

[@anudeepthodupunoori7115]

I asked chatGPT to suggest good youtube channel to learn python and it shows your channel in top 5 .. 👏👏 But i already learned python from ur channel 😂

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i got the joke

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[@immortal_here]

Bruh, thanks a lot , day after tomorrow is my cs examination in ICSE 10 and I was confused in this wrapper class . This helped me a lot

[@basudevpaul8417]

ParseInt wala achha laga : ).

[@unemployedcse3514]

awesome ❤

[@monishzeek5862]

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[@user-ll5qj9tj5c]

when i taken as integer as string and printing directly without converting its working fine how

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I want spring boot update I can’t wait to see ya content

[@rayananaresh3125]

Bro what platform are you using to write the code Pls tell and share with me

[@salmanrizwan9076]

Visual Studio Code is the IDE he's using

[@randomperson-yj1xo]

Thank you, can you do a video with programming questions? so that children can have revision?

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Which ide is this

[@gujjushanmukhasaipavankuma8983]

Visual Studio code

[@jaisuriya9552]

Integer b = (Integer) a ; what about it sir :>

[@susobhandas18]

Sir, Why do we initialize object?

[@SaiErukulla]

To access the value by passing object reference variable in sout

[@jagadeeshsadam9990]

Sir please upload C# video also .

[@Bdbdjdidnbwk]

and now, we can't use new Integer anymore :)

[@xurdeor3247]

similarly // Converting Integer to String Integer myInt = 456; String str = myInt.toString();

[@MoeMoe-qr7od]

I think , better use String.valueof();

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[@Pavankumar-xl4ov]

oh why you are teaching the same topic again, is it just for the money or we will get anything extra from this video

[@subhanishaik7745]

durga sir having good teaching skills and less technical skills

[@subhanishaik7745]

u have very good technical skills and less teaching skills.

[@prabinlamsal74]

But what is wrapper class? lol

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Lund

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[@AravStark]

int num = 7; // normal assignment Integer num1 = new Integer(num); // boxing Integer num11 = num; // auto-boxing int num2 = num11.intValue(); // unboxing int num2 = num11; // auto-unboxing

[@sravanit2002]

Thank you it's very helpful