7.16 How to use Static Block in Java Tutorial

Printing Something without any statement in Main Method.
Static Blocks are called before main Method.
Static Blocks are called as soon as your class is loaded in JVM.
Static block is a block of code which is preceded by the static keyword. Static block are also called
initialization block .It can be used to print something without any statement in Main Method.
Static Blocks are called before main Method.
Static Blocks are called as soon as your class is loaded in JVM.
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[@javadoctor101]

Lol..someone is doing pooja in the background..desi will relate..nice tuts btw..

[@thestarinthesky_]

Thank you Telusko. You have done a great job!I learned a lot.

[@karrinagasatyanarayanaredd1921]

sachin tendulkar: made batting look so easy .. navin reddy: made java look so easy

[@mayankmaheshwari6400]

Would be better if you can increase your pitch a bit. With my laptop volume full, still I am facing issues in hearing!

[@Sunny_sharma007]

Navin sir you r awesome😃😃😃😀apun ko programming smj arahi ha ab 😄😄Thank you so much

[@swaminathbera6407]

Does this mean static block is always called first, even before main(). It was interesting to know :)

[@prasadsardesai]

You made java very easy for me Thanks 🙏

[@tissuegameshow]

Great Tutorial !!

[@jww7663]

thank you, it is very helpful

[@sweatheart786]

we can initialize static variable in main method too.

[@user-cc4si1rp7w]

super helpful sir, thanks

[@deepaligupta9031]

But in the previous lecture 7.15 i.e. count number of object, constructor worked on static variable as it has increases the count of i. Please elaborate

[@Tali1562]

Thanks!

[@somsuvrochakraborty9853]

Thanku..a lot

[@hhhuhhh5692]

thanks a lot!

[@anirudhbhardwaj6834]

Thank you

[@pulkitsharma5792]

But we can initialize the static variable at the time of declaration itlself? Why we need stattic block

[@amitashah3711]

Simple question .first without writing any static string both static block executed 1st & then main,& after using static string first main get executed then static block why??

[@souvikpal6262]

@ 5:30 you said we cannot use constructor for manipulating static variables , but as constructor is non - static member method we can access a static variable within a non-static member function, isn't it ????????????????????????????

[@furyperry4374]

YES YOU CAN USE IT package Apple; public class banana { static String s= "hello world"; banana() { s="martha"; } public static void main(String[] args) { banana x=new banana(); System.out.println("the value of s is " +s); } } OUTPUT: the value of s is martha. although the creation of object was just to initialize the constructor , so that we could assign "martha" to the String s

[@thestarinthesky_]

It means that in general for initializing static variables, you don't have to use constructor, which is generally used to initialize instance variables. In this example, we don't have to create an object and then call constructor to initialize the static variable. We can simply do that by static block.

[@mohanishsaim6299]

@@thestarinthesky_ Thanks

[@abdelde8553]

Hello; I do really appreciate your tutorials but i have a short question In this video you said that constructors only works on instances variables but in the last video about counting number of objects we used a class variable to count number of objects ( static int i)

[@villagecoder]

If I understand you, you mean there was a code in the constructor that did counting or arithmetic. You should understand that constructor is a method, a special one, so you can execute any block of code within. This block of code will be executed while an instance of the class is created. You should understand that constructors do not only initialize fields when creating instances but they can even call methods to perform some operation in the course of creating an object. In the case of static blocks, they are also called static initializers because they only intialize static members. Constructors initialize all fields. Look at this example: public class Test{ int a, b, c; //Constructor public Test(int a, int b){ this.a=a; setB(b); //setB method called in a constructor c+=4; //arithmetic in constructor } public void setB(int num){ b= Math.abs(num); }

[@naoyoshino7014]

Is it compulsory to write main function? Because static is already writing hello world

[@TheSumit22]

so most of your examples can be executed in the static block itself, with a blank main method. what are the intended application of these static blocks?

[@aarushigupta1106]

thanks for this video but plzz tell can we not use static methods to give a value to static variables if yes whats need of static block

[@coolrudra2529]

you can correlate it to "the purpose of default constructor", like we have constructor to initializing the instance variable , likewise static block is there for initializing static variable to any particular value

[@Coalpot-Jollof]

Imagine the static block as an initializer of static fields. It can be used for different stuff as the programmer wishes

[@abhishek_sengupta]

Can't we directly initialize a static member without using static block?

[@sohampal759]

public class StaticBlock { static String s = "Hello world"; static { // System.out.println("Hello world"); } public static void main(String args[]){ System.out.println("the value for s "+s); } } this runs...

[@abhishekabhi732]

Then we can write out code in static only no sir? Why we can write in public static void main?

[@mohitmishra8100]

can we do multiplication like 10*5 without using any arithmetic operator?

[@rahulpradhan5585]

Yes With the help of recursion a=10; b=5; Int product=0; for(int i=1; i10+10+10+10+10=10*5 I hope u get the point

[@avineshtripathi7458]

@@rahulpradhan5585 exactly u used to the arithmetic operator so try using increment operator by logic that a method favorable for ur situation

[@unmeshchougule5666]

Your explanations are very good but we need more practical examples apart from demo and hello world 😃

[@tanmaykumar6856]

sir the volume in the video is a bit on the lower side

[@harisankarl6292]

nice

[@krishnadaram1568]

Could you explain non static block.. Sir!!

[@krishnapritampaladhi7509]

you made me a programmer

[@i_karank]

cant we initialize static variable s with "hello world" during its declaration?

[@sayanmukherjee8563]

Yes, we can.I have run the code initializing s while declaration.No error found, works fine.

[@snehayannam6872]

sir, here 1st the static block will be exectued, then main block will be executed no sir so the output has to be hello world the value of s: hello world

[@swarnaraha7166]

+sneha yannam i also have the same confusion

[@arveersingh9728]

its because we declared the value of s but we didn't print it out in the first place.

[@gauravpande]

I like your confidence :)

[@furyperry4374]

This would have been the case if we would have Printed the value of the static variable s in the static block, but we are just assigning it a value . i.e firstly s is assigned the value : hello world and then when main method is executed , it prints outs the value

[@daakshayaniallu2277]

shouldnot we assign the value for s =helloworld without using staticblock

[@krishaengineer9754]

same question

[@coolrudra2529]

you can correlate it to "the purpose of default constructor", like we have constructor to initializing the instance variable , likewise static block is there for initializing static variable to any particular value

[@lh6845]

What happens if a class extends a parent class? Does the parents class get loaded what if the parent extends another class? What if that class has static and init methods?? In what order will it execute?

[@unmeshchougule5666]

Just try it yourself, its easy 😉

[@mohamedthoufiqm8108]

❤️

[@senurachamuth]

public class A { static int x; A() { System.out.println("Constructor"); } static { x = 7; System.out.println("Static 1");} {x = 8; System.out.println("Static 2");} public static void main(String[] args) { System.out.println(x); A a = new A(); System.out.println(x); } } how this happnd

[@JP-yf2kp]

constructor only works on instance variable is wrong buddy. constructor also works on static variable.we can do it without static block using constructor.

[@md.adittorehan6389]

Yes. But I think we have to make object of that class in another class to do that.

[@maxkaraev7306]

You need to keep your voice level constant! buddy. I tried to watch this but couldnt.

[@geethamadhurivasa5779]

whats the output public class Main { static String s=""; static{ s="hello world"; } public static void main(String[] args) { System.out.println(s); } static{ s=""; } static{ s="abcd"; } static { s="efgh"; } } first guess and try it in compiler

[@SunilKumar-cu8wm]

I think there'll be no simpler way to understand use of static block...

[@Coalpot-Jollof]

There is a way to understand. DONT BE LAZY

[@sapnavats9105]

We can also initialize a static variable without using static block in a normal fashion. So what is the requirement of static block?

[@Coalpot-Jollof]

If you need to execute some code before the creation of an object then use the static block

[@ashishsaini2765]

Static block is used to initialize static variable dynamically

[@vipulshah7091]

Sir can you please explain that why do we use a static block?

[@yashroushan5543]

4:22

[@indiagood3667]

somebody is ringing bell.

[@Chandrikareddyy]

what happens if i say my class as static? as we do in the abstraction of class ? can it turn all the methods of class into static?? A static{ m(){ print("say y or no ") } } i tried but showing a error saying you already declared static ???

[@gauravpande]

I don't think you can make your class static, but can make an inner class static

[@thilinsmsnoj]

why are u doing static in your class , what is the reason ?

[@susobhandas6143]

why you make videos with bad sound

[@susobhandas6143]

bad sound in this particular video

[@ieftnrightasmr9662]

lol someones doing puja

[@pranabroy8218]

My whole programming life was a lie.

[@Draven1334]

dislike for the annoying sound in the background

[@sasmalpayal]

Can we create a method within a static block?

[@varunaggarwal1995]

No you cannot, but you can call a static method from static block and can initialize a static variable. you cannot access non-static content from static block

[@sasmalpayal]

Hmm thank you

[@mhlengimanqele4496]

Exactly what I was asking myself... thank you!!!

[@geethamadhurivasa5779]

whats the output public class Main { static String s=""; static{ s="hello world"; } public static void main(String[] args) { System.out.println(s); } static{ s=""; } static{ s="abcd"; } static { s="efgh"; } } first guess and try it in compiler