How Java Program Works, Compiler, Interpreter | Java Tutorial

In this step by step java video tutorial for beginners you will learn how a java program works, what are compilers and interpreters in detail with example.
Get the source code for our tutorials at our website
www.LearningLad.com
LearningLad in social media
facebook / learninglad
twitter / learningladedu
Google+ www.google.com/+LearningLad

[@theshermantanker7043]

Here's a Tl;Dr for everyone: Java is normally first compiled to an intermediary language which is stored in a JAR File. This file is then run by the Java Virtual Machine. Initially the JVM interprets the bytecode but as time passes it slowly compiles the code to native machine language. So Java is in essence, both Interpreted and Compiled. (As a side effect of this Java is the only language that gets increasingly faster as time passes; While most other programs written in other languages will stay at the same speed throughout, Java programs tend to execute somewhat slowly when first starting up, but will speed up over time and can get as fast as even C/C++ programs are) I will mention that the official Java compiler has the option to compile Java directly to the target executable instead of JVM bytecode however

[@eikepru1485]

you mind further explaining why Java Compiling time increases as the program gets bigger?

[@edasaydan507]

The best explanation of the difference between a compiler and an interpreter, thanks a lot, keep up the good work!

[@danielpinto1628]

The sweet accent of "I'm gonna have this technology subject as well explained as I'd ever wish"

[@kkNari-fd9cw]

Nice Tutorial for beginners!. Simple and straight. Thanks guys.

[@dawidciezadlik6707]

This explanation is the masterpiece. Thanks sir.

[@angusquigley3713]

Awesome video. This not only coincides with the information on the java docs. But it clears up some problems I had. Thanks

[@LearningLad]

my pleasure :)

[@genehorecka504]

Awesome video, very easy to understand. Thanks for this

[@LearningLad]

+Gene Horecka pleasure man :)

[@nadiameftah1230]

thankkkkkkkkk u you saved me from a whole chapter reading

[@jonasmoyo9479]

simple and straight to the point. Thank you.

[@LearningLad]

my pleasure :)

[@mallikarjunaswamyb3765]

Very easy explanation ..Great work !

[@DaBBoSaH]

this is really good! Thanks

[@DanishShaikh-px7ye]

really great video bro, really helpfull.....thanks for it..!!

[@danielhj1994]

The best explanation available on KZbin

[@LearningLad]

thank you :)

[@drmikroskop]

EXTREMELY COMPLETELY HELPFUL VIDEO... THANK YOU.

[@LearningLad]

+MVN CHANNEL pleasure :)

[@vmvsairam436]

Hi, thanks for such a neat explanation. So this satisfies the platform independent concept of java.

[@LearningLad]

Vmv Sairam i'm glad that my video's are helping you :)

[@kko2537]

Thank you my friend!!!!!!!!!!!!!!

[@ashishpatil2059]

i have an request to you anil sir, can i use your video links,youtube links on my website. m asking you links ha..is it legal..?

[@user-sj3fp2xq2m]

So the whole process with Java compiler is more similar to a translator than the regular compiler since it executes the code line by line ?

[@tadassatafarra7503]

awesome video well explained!!! thanks a lot

[@YawningMoon]

I have a question that why we use both the compiler and interpreter in java to execute final programs. Why not only interpreter or a combination of compiler and executor?And which one would be better(faster/efficient)?

[@EditsBySuri]

Anurag Mittal that's the reason java is a platform independent. Convert whole HLL into one file and then convert then into m/c form and execute them... This idea is why Java is surviving.

[@hikikomori9387]

thank you... so the compiler converts the entire .java file into .class file (at once) which is the intermediate code...then that .class file is somehow passed to JVM(platform specific) which works as both interpreter and the executor...so the JVM interprets the .class code to MLL on line by line basis and further each of those lines are executed to produce the output... am i right?...correct me if im wrong

[@akhil6095]

Just got what I want.... Nice tutorial!!!

[@LearningLad]

thank you. Keep Learning :)

[@pawandeepsingh2155]

Thanks for the video, 1 question, I can compile and execute C++ file in any platform I want. So why Java is made so complicated of firstly compiling and then interpreting.

[@LearningLad]

pawandeep singh In c++, you need to write code and build applications for specific platforms. for example you can write a program and then, for windows you need to create the application of that program with windows specific codes. for linux you need to create the application of that program with linux specific codes and so on. you can't run the application you have created for windows in linux and vice versa. But with java you can take a jar file and then run it in any platforms. It is possible because the compiled java code will be interpreted by java virtual machines (we have platform specific java virtual machines) as needed for their platforms. So write once execute anywhere.

[@dhanushkaweera]

essential video. Thank you

[@LearningLad]

+Dhanushka Weerasinghe pleasure :)

[@danielsmith5032]

This was 100% excellent. Thank you

[@LearningLad]

You're welcome!

[@debarghyapodder3613]

it was brillant..... thanks for the wonderful explanation

[@LearningLad]

You are welcome!

[@puramjagadish6697]

Hello sir videos are good and explanation is superb.plz make videos for Advance Java sir...

[@LearningLad]

Sure. Thank you.

[@oliverbull1180]

Amazing! thank you :)

[@LearningLad]

Pleasure

[@venkat2830]

sir, what is the difference between java bytecode and result produced by JVM? compiler converts high level language to machine level language then what is the use of JVM.

[@ballobabouski3539]

I think that the Java Compilers and Interpreters , mostly , they are doing the same thing . so , we can use a compiler without an Interpreter ? or vice-versa ?

[@marvelousyouth4650]

thank you best java tutorial

[@LearningLad]

You're welcome!

[@SahilSingh-ge2wk]

Don't you think you missed something during the interpretation of byte code into object code because if only interpreter is used then java will lose one of its feature as in the time of looping JVM also use JIT when a looping structure occurs for fast execution ...

[@shorouqadel8806]

Thanks sir you answered on my all questions ❤️

[@LearningLad]

Always welcome

[@dirdhapawitra7445]

so helpful thank you

[@LearningLad]

my pleasure :)

[@nissymarcokondamudi1213]

Thank u sir its really good!

[@LearningLad]

NissyMarco Kondamudi pleasure man :)

[@durgaresortyamunotri8075]

Thanks

[@SealOSRS]

So that necessarily means java is a JIT language? And also, I wonder if there is a jvm version for Apple products such as iPhone?

[@LearningLad]

hi +XpaR, JIT is a property of the runtime, not the language and it is available in jvm. I think It is possible to run a JVM on a Mac, but Apple excludes JVM from running on any iPhones or iPads. I'm not 100% sure about this so feel free to ask others :)

[@HNK-ln7hq]

Good video but why is it when I write python code I can just execute the python code by writing the file name and .py at the end. Why do I have to compile first in Java?

[@anjanpandit1850]

Wonderful explaination

[@LearningLad]

Thank you :)

[@sarahcharlotte6681]

I can't thank u 🙏 enough air

[@LearningLad]

glad my video helped you :)

[@ananyach5023]

thank you soooooooooooo much cant thank u enough for dis...thank u so much SIR!

[@LearningLad]

+ananya chakraborty pleasure :)

[@ananyach5023]

SIR U DO NOT HAV ANY VIDEOS FOR SQL,DBMS?????????

[@ananyach5023]

I NEED AN URGENT RPLY SIR...PLZ

[@LearningLad]

+ananya chakraborty no we don't

[@ananyach5023]

plz add ...its an habit now to learn the staff from u...no other tutorial is ds much helpful

[@abhishekmaharishi6679]

Anil sir why can't you make video on java's spring framework and also on android tutorials from beginners to advance ?

[@vandanakumari7397]

Clear explanation

[@LearningLad]

Thank you :)

[@JoshFlorii]

Very good video. Thanks

[@LearningLad]

pleasure :)

[@THBeatZz]

thank youu!!

[@LearningLad]

my pleasure :)

[@sunitha6330]

very clearly explained

[@LearningLad]

Thank you :)

[@pranaysangeeth8789]

thanq

[@amrutamitti2596]

Informative content

[@LearningLad]

Thank you :)

[@karlomagnoguadalupe4843]

6:28 all I need to know. Great video though, thanks.

[@LearningLad]

Welcome :)

[@MUKESHKUMAR-yw8by]

Thanks you sir

[@LearningLad]

my pleasure :)

[@ekams5902]

will d code work if after making the output file ,the compiler is deleted.

[@lisasamaddar4160]

Ekam S no ...because The JDK contain JRE..JRE..contains of..Class libraries,other supporting files..so if..they are erased..the program will become..invalid..and will not show the..given output!!

[@PramodChamlingRai]

What is the java compiler ? Like c++ has gcc compiler.

[@LearningLad]

some major java compilers available are java compiler included in the Java Development Kit from Oracle Corporation (javac)GNU Compiler for Java (GCJ) Eclipse Compiler for Java (ECJ)

[@PramodChamlingRai]

Thanks for ur replying sir

[@shafaqshaikh3506]

nice Vedic thank you sir

[@LearningLad]

Pleasure. keep Learning :)

[@SureshKumar-cm8mx]

sir, please upload your full video

[@harinipriya6710]

thank u sir

[@LearningLad]

Welcome

[@imanebousekraoui5665]

good explication

[@LearningLad]

thank you :)

[@Codeshub2024]

Yes sir

[@rexroy4037]

Good one...

[@LearningLad]

Thank you :)

[@AliVallil]

Very nice explanation...as a beginner, i have one question, what software we can use to write a java program? And can we use the same software to compile the program or any other software? You explained how a program can be converted to executable format, okay, if we have executed format, Can we go back from the executable file to get the source code of that application?

[@lisasamaddar4160]

Muhammed Ali V you can use..Netbeans,eclipse as an IDE..

[@MaheshKumar-xd4xx]

Hi There, As a beginner it will be recommended to use Notepad or Notepad++ for good practice and good syntax knowledge.

[@umeshshelke578]

nice.....

[@LearningLad]

Thanks

[@krishnakumar4115]

super brother

[@LearningLad]

Thank you :)

[@jayshreesonar7817]

When interpreter use?

[@qwerrtypad7927]

what is intermediate code bro?

[@prateek4524]

🔥🔥

[@LearningLad]

thanks :)

[@priyaranjanmantri9332]

Why java file name same as class name

[@shando_tube]

V fire video brother

[@shehryar8776]

make tutorials for matlab

[@surajbhowmik7948]

Watching after 6yrs of upload 😷👀

[@talosanconsultingfirm5103]

who is watching 2019 is it used for 2019

[@1991deeps]

Where is JIT compiler?

[@furletov]

Thank you, this is very very helpful. Please improve your pronunciation and it'll be even more helpful :)

[@khanlakhno2757]

Я дольше минуты не смог прослушать, уши завяли от его акцента

[@alabed9393]

في عرب هنا هلا

[@sankalpbansal4]

that accent, also its 2014 so

[@IceJackal1984]

this guy eats while talking 😅

[@kyamasthailife8160]

First learn English language properly.. then make vdos on java.... Worst language mistakes made.. The caption should have been how to get 0/100 in language

[@ood9555]

why all indian gays in youtube about code??)

[@EditsBySuri]

Thanks