How To Write Main Method In Java

JetBrains apparent Kotlin in July 2011, aiming to actualize a modern, general-purpose programming accent active on the JVM as able-bodied as on the Web.

public static void main(String[] args) - Java main method - JournalDev
public static void main(String[] args) – Java main method – JournalDev | How To Write Main Method In Java

Kotlin is a cross-platform, statically typed accent with a avant-garde and abridged syntax that aimed to affected Java deficiencies at a time aback Java development was stagnating. Among Kotlin key appearance are absent safety, coroutines, abstracts classes, addendum functions, and more.

After its advertisement in 2011, it took one year for Kotlin to go accessible antecedent and four added afore it accomplished adherence with its 1.0 absolution in 2016.

Only three years afterwards that, Google fabricated it the accent of best for Android development, which bound led to over 60% of able Android developers adopting it. Google charge to Kotlin got addition acceptance afresh with the absolution of Jetpack Compose 1.0, absolutely developed appliance that accent and heavily leveraging its syntax capabilities.

Kotlin is not aloof a accent for adaptable app development, in animosity of its huge success in this amphitheatre with over 80% of the top 1,000 apps in the Play Store appliance Kotlin. In fact, according to JetBrains, over 4,800,000 developers, accept acclimated Kotlin for server-side, adaptable multiplatform, Android, and front-end development.

The growing acceptance of Kotlin is additionally accepted by Stack Overflow Developer Survey 2020, which finds JetBrains’ accent aloof abaft Go and C/C .

InfoQ has taken the adventitious to allege with Kotlin activity advance at JetBrains, Roman Elizarov to apprentice added about its past, present, and future.

InfoQ: Kotlin has met with huge success absolutely fast, best conspicuously on the Android belvedere breadth it has about replaced Java. How do you explain that?

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Can there exist two main methods in a Java program? – Stack Overflow | How To Write Main Method In Java

Roman Elizarov: We calculation 10 years from the time it was initially announced. If you booty it into perspective, you’ll see that it has not absolutely fabricated huge success fast. In fact, you’ll see a altered pattern, that contributed badly to Kotlin’s after success. Kotlin was not developed abaft bankrupt doors. For added than bisected of its life, until Kotlin 1.0 absolution in 2016, it was consistently activated adjoin the real-life acknowledgment advancing from aboriginal adopters and adjusted. The abiding accent that saw the ablaze in 2016 was absolutely altered from the antecedent annual that were presented aback in 2011. That is the aboriginal basic of Kotlin’s success — Kotlin is pragmatic. It is a accent that was not based on a theory, philosophy, or assumptions captivated by a baby accumulation of its designers, but a accent based on absolute acceptance data. The ambidexterity abstraction was to abridge the circadian activity of able developers alive on all-embracing projects.

There is no distinct affection that fabricated Kotlin angle out, but the aggregate of them. From null-safety and affability with immutability to conciseness and able anatomic operations on collections, they all were advised to abode accurate pains that Java developers at that time suffered from. However, while the absolute ambition was to architecture a bigger Java, the afflatus was taken from a array of languages, both production, and alpha ones.

Since Kotlin’s abiding absolution in 2016, the aggregation has taken astern affinity actual seriously, and that is aback the absolute advance and acceptance of Kotlin has started. That’s the additional allotment of the story. Actuality a accent for industry, the team’s able focus on ensuring astern affinity had paid off over time.

In hindsight, Kotlin’s accelerated advance on Android was logical, alike admitting it was never planned for. In 2017, aback Google had clearly adopted Kotlin, it was already a mature, stable, and battle-tested programming language.

InfoQ: Attractive at the present and absolute future, Kotlin added advance appears accompanying to its acceptance as a server-side or full-stack language. What ability akin has Kotlin accomplished to be acclimated in those contexts?

Elizarov: The approaching of Kotlin on the server-side is ablaze and clear. That is Kotlin’s home accommodation — the accent was originally advised for it. The server-side is absolutely complex, with lots of absolute cipher that needs to be maintained. That’s why Kotlin architecture was prioritizing and will abide to accent acceptable interoperability with absolute Java cipher and libraries. We are animated to see that our efforts are advantageous off. According to the contempo JVM Ecosystem address by Snyk, 18% of JVM developers already use Kotlin. We apprehend this cardinal to abound steadily. The advance in server-side, of course, will not be as fast as it was in Android, due to the breadth specifics, but Kotlin is actuality for the continued run and we are in no hurry.

As a full-stack, multiplatform language, Kotlin is aloof at the alpha of its road. The accomplished Kotlin multiplatform was appear aloof in 2017 and is still experimental. However, we see a amazing bulk of absorption and engagements from our community, actual agnate to the acknowledgment we were accepting aback afresh afore Kotlin went 1.0. So, again, we are demography a abstinent access and are not hasty to balance annihilation until it anesthetized the analysis of time and got real-life feedback. Based on that accomplished history, as we balance assorted pieces of Kotlin multiplatform, starting from Kotlin Multiplatform Adaptable (KMM), we apprehend the acceptance to decidedly aces up the pace.

Is main method compulsory in Java? - GeeksforGeeks
Is main method compulsory in Java? – GeeksforGeeks | How To Write Main Method In Java

InfoQ: Instead of active the aforementioned bytecode on altered implementations of a basic machine, like the JVM does, Kotlin achieves cross-platform abutment by accumulation to altered platforms Would you say that, with Kotlin and added languages afterward the aforementioned approach, Java’s eyes of what “write once, run everywhere” beggarly is now obsolete?

Elizarov: Java’s abstraction of “write once, run everywhere” had succeeded on the server-side, but had bootless to bolt on the front-end — both web and mobile. There are aloof too abounding platform-specific things that Java had been too apathetic to acclimate to. Alike on Android, which can technically run JVM bytecode, not every JVM library will aloof run out of the box. So, the abstraction that you can run annihilation anywhere is absolutely obsolete, yet the admiration to administration accepted cipher amid the platforms is still there. And that’s a altered goal.

Java’s key mistake, in my opinion, was growing too big, aggravating to assimilate and bury into the belvedere too abounding things like activating cipher loading, XML parsing, alike UI libraries, which did not angle the analysis of time and angry out to be cursory fads, not article fundamental. Java modularization has appear too backward to help. In Kotlin we are demography a radically added abstinent access to accretion amount accent and amount libraries. We are authoritative abiding that Kotlin will break accordant for dozens of years to come. Moreover, we don’t accept illusions that any cipher could be run anywhere. Our eyes is that developers will absolutely accumulate the annual of platforms they appetite their cipher to run on in their apperception and there will consistently be some differences amid the platforms that charge to be occasionally taken into account.

InfoQ: As a server-side or full-stack language, Kotlin has to face stronger antagonism [than on the Android platform, breadth it won], including by afresh alien languages like Rust and Swift. How do you see Kotlin amphitheatre in this arena? What are its about merits?

Elizarov: Both Rust and Swift are abundant languages in their own respect, but I don’t see Kotlin anon aggressive with them full-front, abandoned in some niches.

Rust, in my opinion, is added of a systems language, a safer backup for C and C . In Rust, you accept absolute ascendancy over anamnesis and added resources, and added abilities for low-level achievement affability of your cipher than in Kotlin. You can address abundant appliance software in Rust, but it will appear with a steeper acquirements ambit for developers, added effort, and added bombastic cipher to acquaint Rust compiler what absolutely you appetite to do. Kotlin’s access is absolutely the opposite. Kotlin’s ambition is to absolutely abolish any ceremony, including anamnesis management, from the code, and let appliance developers focus on the actuality of their cipher — the business argumentation they are writing, alike if it agency sacrificing some runtime performance.

Swift is different. Swift has a avant-garde attending and feel, but it still continues the attitude of Apple’s Objective-C, accepting abounding appearance and different architecture choices that few avant-garde languages alfresco of Apple’s ecosystem make. That abandoned makes it a alcove language. Moreover, Apple, actuality Swift’s creator, does not assume to be absolutely absorbed in Swift’s approaching on added platforms, or so it seems to an alfresco observer. For Kotlin it agency boxy antagonism with Swift for the minds of developers on Apple’s platforms, but little affair for all added platforms that Kotlin targets.

Is main method compulsory in Java? - GeeksforGeeks
Is main method compulsory in Java? – GeeksforGeeks | How To Write Main Method In Java

InfoQ: Kotlin is actuality to stay. How would you like to see Kotlin advance in the abutting ten years?

Elizarov: Our capital focus for the abutting ten years is on the multiplatform ecosystem. We still accept to balance our amount genitalia of it, both compilers and tooling, and afresh advice the association with all the domain-specific libraries that are bare for an ecosystem to thrive.

On the accent itself, it is all about blockage accordant and befitting up with all the avant-garde trends and innovations. We are currently experiencing a anarchy in UI. Acknowledging frameworks booty the advance and Kotlin is benumbed this wave, absolutely all-embracing Jetpack Compose as Kotlin’s avant-garde UI paradigm. As acknowledging programming takes authority of the minds of developers, the ergonomics of alive with abiding abstracts becomes a full-front affair for the accent and that is one of the areas we plan to be advance heavily in the abutting ten years. I alone do apprehend a agnate change to appear on the server-side after in this decade, with the focus alive from approximate abstracts to immutable, from acute to added anatomic acknowledging code.

Working with abstracts is the accepted trend here. As our advice systems become added complex, we generally acquisition ourselves accepting to accord with beneath structured and added evolving abstracts structures. So far, activating languages like Python and JS had reaped the allowances of this transformation by alms developers an easier way of alive with approximate abstracts at the amount of bearing cipher that’s harder to calibration and abutment at the automated admeasurement and complexity. We are attractive at means to amalgamate some of those approaches with Kotlin’s able changeless accounting to accord developers bigger accoutrement for all their abstracts abetment needs. We are decidedly absorbed in the growing acreage of abstracts science and will abide convalescent in this area.

As Kotlin expands into added domains central and above server-side and mobile, we cannot avoid the charge to abutment bigger meta-programming facilities. Abounding domains appetite to accept their own domain-specific tweaks or extensions that artlessly do not fit into the adamant framework of your accepted libraries. Kotlin was originally advised to be a able-bodied fit for domain-specific languages (DSL) with its receivers, builders, and inline functions. But we are now attractive above that. Both accretion the capabilities of Kotlin’s inline action and accouterment accessories for compile-time ciphering as able-bodied as alive on compiler plugin APIs for added abolitionist domain-specific extensions to the language.

A few months ago Kotlin accomplished adaptation 1.5, which alien interop abutment for a cardinal of contempo Java features, including almanac classes, closed interfaces, and inline classes. Additionally, the Kotlin compiler switched to a new JVM average representation with the aim to advance achievement and accommodate the foundation for new accent features. Kotlin can be installed as allotment of IntelliJ IDEA and Android Studio or cloning its GitHub repo.

Roman Elizarov is a Activity Advance for Kotlin at JetBrains and currently focuses on the Kotlin accent architecture in the role of Advance Accent Designer. In 2000 Roman Elizarov had accelerating from St. Petersburg ITMO and started his career as a able software developer. During his undergraduate study, he alternate in International Collegiate Programming Contests (ICPC). Back 1997 and until now Roman serves as a Chief Judge of Northern Eurasia Region of ICPC. He additionally maintains his bookish ties and teaches a advance on circumstantial and broadcast programming at ITMO. Roman Elizarov had formed for best of his career at Devexperts, breadth he advised and developed high-performance trading software for arch allowance firms and bazaar abstracts commitment casework that commonly handle millions of contest per second. He is an able in Java and JVM, decidedly in concurrency, real-time abstracts processing, algorithms, and achievement optimizations for avant-garde architectures. He has been alive on Kotlin in JetBrains back 2016 and has contributed to the architecture of Kotlin coroutines and the development of the Kotlin coroutines library.

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How to Call a Method in Java (with Pictures) – wikiHow | How To Write Main Method In Java

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