Why must dictionary keys be immutable in Python. How do I remedy "The breakpoint will not currently be hit. static is the key word is indicate in .net that, it can not be changed. Since C and C++ additionally have comparable principle way which serves as a passage point for program execution, taking after that convention will just help Java. pr is the object local to main method so you are not accessing the variable i directly but through the local object and "PR" is not static. You need an entry point into your program. Find centralized, trusted content and collaborate around the technologies you use most. Whenever a static keyword is applied, it signifies it doesnt require any instance to access the variable and function, it can be accessed directly by the class itself. Main method is always static because non-static members or methods should not be called with the class name directly. What is the use of main() in the program? In any Java program, the main () method is the starting point from where compiler starts program execution. If we make the main method non-static, JVM will have to create its object first and then call main . The others are quite wrong, for reasons highlighted. so the main entry point of application is fixed can not be changed as definition. So static things we could invoke without creating instance of that class. It's about a design decision. - Quora. Because the object is not required to call the static method. You are trying to use a double for the size. Developed by JavaTpoint. Why is the Main() method use in C# static? Coming soon, the Groundbreakers Developer Community will be migrating to Oracle Forums for a refreshed experience. Since the primary method is static Java VM can call it without making any instance of a class which contains the principle method. Why Java Does Not Support Multiple Inheritance? Static methods have access to class variables (static variables) without using the class's object (instance). I think both answers are correct, it is a design decision because they took into consideration what you said in your answer, IMHO, This is the (only!) In Java static is a keyword and it tells the compiler that particular entity belongs to a class and should be loaded once the JVM starts. So, it is required to define main() method public and if we define the main() method as non-public, it will throw the following error: The static is a keyword which we use in the main() method to define it as static. Why main method is static in Java Geeksforgeeks? Why is apparent power not measured in Watts? JVM will have to create its object first and then call main() method which. That's why main method is static in Java. Lets suppose we do not have main method as static. Why Main () method is Always static ? Static means that you can call the function without having to instantiate an object/instance of a class. We can't use new keyword because, when the class is loaded and compiled, the static keyword by default instantiates or creates an object of that class method, so that is why we directly call a static method. If a class named Test has a non-static method named show(), then how it would call an instance: Conceptually, it would be possible for a framework to specify that rather than using a particular static method to run a program, it will instead construct a default instance of some particular class and run some particular method thereon. Can we change the order of public static void main() to static public void main() in Java? What exactly does it mean for Main to be static? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Take a look at the C# language specification: Application startup occurs when the execution environment calls a designated method, which is referred to as the application's entry point. 3. void: The return type of the main method is void which means that it does not return a value to its caller. static When the Java program starts, there is no object of the class present. Points to note- main method in Java must be declared public, static and void if any of these are missing; java program will compile but at run time error will be thrown. Look at the below java program example, main () method is declared public static void in a class called Test. The main () method is static so that JVM can invoke it without instantiating the class. But at runtime, the JVM searches for the public, return type static, and array string as an argument if it would not found, then the error is shown at the runtime. 6.07 MB. And to that date, C and C++ languages consistently widespread in the world of computer science. 1. public: The public modifier makes it accessible from anywhere in the application. We create main() method with public access specifier to execute it by any program. rev2022.12.9.43105. Books that explain fundamental chess concepts. It can be invoked without creating the instance of the class. They are static because they must be available for execution without an object instance. Vote count: 16 JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. You also explained that the main method is the entry point of the program. The language designers chose this way. We declare the main method as static, which means that JVM can call the main function directly using the direct class name. why main() method is declared as public & static ????? Ready to optimize your JavaScript with Rust? one of the following signatures: As shown, the entry point can optionally But that doesn't mean that this decision was arbitrary. Because the object is not required to call the static method. A similar question was asked about java and I think the answers apply here too: It's not clear whether you're asking because you don't understand what, you can't instantiate an object before you're inside the program. Thats patently false. package Study; import java.util.Scanner; public class Methods { public static void main (String [] args) { Scanner scan = new Scanner (System.in); double x=scan.nextDouble (); double arr []= new double [x]; } } Array sizes have to be integers. The cost wouldn't be huge, but without any potential identifiable benefit there's not much point in accepting even a trivial cost. Penrose diagram of hypothetical astrophysical white hole. We create the main() method as static so that JVM can load the class into the main memory. //static variable declarationstatic int a; //static function declarationstatic void fun(){..}, //static function callclass company:{static void fun(){. Static method of a class can be called by using the class name only without creating an object of a class. Why can't static method be abstract in Java? Probably it is an influence of other languages like C, C + + and Java. void indicates that the main () method is declared does not return a value. Static block is a block which is created to initialize static data members. As a result, object creation is bypassed because the main method is declared static. What he wants to know is why he must use a static method. Author: www.quora.com. Is Energy "equal" to the curvature of Space-Time? Can we declare main class as static? Every instance of a class has access to the method. Why can't we use the "super" keyword is in a static method in java? You can call a static method without creating any object, just by using its class name. Why main() method must be static in java? In this case a compiler option must be added telling the C# compiler to mark a different method as the entry point of the program. Need of static in main() method: Since main() method is the entry point of any Java application, hence making the main() method as static is mandatory due to following reasons: The static main() method makes it very clear for the JVM to call it for launching the Java Application. 1980s short story - disease of self absorption. So, the compiler needs to call the main() method. why main() method is declared as public & static ????? We cannot call a method without creating an instance of its class, and we already told you before that at the time of starting JVM, there is no object of a class. OR. I know the code works fine for public static void Main(). In the same way if you declare a method as static it will be call as static method or class level method. Because, the main method is the starting point of the java program and if we need an object of that class even before the main can be. 2. static: The static modifier makes it a class method so that it can be called using the class name without creating an object of the class. The name of the method is static and we cannot change it. Affordable solution to train a team and make them project ready. Declaring Main as static allows the execution environment to invoke Main without creating an instance of the class. The main reason to make Java language is to make application programs independent of the hardware system to which the program is running. What happens if I remove static from main method? Popularity 9/10 Helpfulness 5/10. Therefore main() needs to be static in order to allow it to be the entry to your program. How to execute a static block without main method in Java? While instantiating it has to call the constructor of that class, There will be ambiguity if the constructor of that class takes an argument. In the following Java program in the class Sample, we have a main method which is public, returns nothing (void), and accepts a String array as an argument. it does not make sense to create an object just to begin the execution of a program. When should a method be static Java? Why the main method has to be in a java class? Main() is the standard entry point to execution of a C# program. It must be static and declared inside a class or a struct. Only one copy of the variable is shared among all the instances of the class. so this is static. Only the static main method can do the job because there is a convention that defines this behavior. Asking for help, clarification, or responding to other answers. It could work differently, but doesn't. As the main() method is the starting point for the compiler to execute the program, therefore declaring the main() static is necessary for the following ways. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The main() method should be static because it is convenient for JDK (java development kit). A static method has two main purposes: For utility or helper methods that don't require any object state.Since there is no need to access instance variables, having static methods eliminates the need for the caller to instantiate the object just to call the method. YOUR ANSWER explains very well what is a static method. Since C and C++ also has similar main method which serves as entry point for program execution, and java was inspired from C, following that convention will only help Java. So, the compiler needs to call the main () method. Mail us on [emailprotected], to get more information about given services. While there is a declaration of instance in the program, it has to call the constructor of the class. Typesetting Malayalam in xelatex & lualatex gives error. Solve Error char cannot be dereferenced in Java, Solve Cannot make a static reference to the non-static method Error, The static main() method makes a path clear for. Learn more. Java main() method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. Any code which wants to use the latter approach would be perfectly free to use: There could be some potential benefits to having the system include its own static method which looked something like: where app.AllowNext() was a method to coordinate with other application instances launched at essentially the same time, to ensure that repeated attempts to launch an application in background would have their Start calls processed strictly sequentially. This entry point method is always named Main, and shall have Static members are shared with all instances of the classes. It will be difficult for various IDEs (integrated development environment) to identify the launchable classes in the project. If we do not define it as public and static or return something from the method, it will definitely throw an error. you may know that you need an object instance to invoke any method. Master Bot. The Java program, which is written on one device, can be executed on any device that supports JVM. What is the difference between String and string in C#? The main method is the entry point of the programit does not makes sense to create an object just for the sake of starting the execution of a program. create an object of the class just to access Main function. By doing that, JVM can load the class into the main memory and call the main () method. No symbols have been loaded for this document." But the questioner already knew that. The main method is static so that it can be called without the creation of an object or before the creation of an object of the class. MY ANSWER says that there is no fundamental cosmic reason. By defining main() method as static, JVM can invoke it without creating object for the enclosing class. 320 kbps. That's all about why the main method is declared public and static in Java. A static method can be called directly from the class, without having to create an instance of the class. To learn more, see our tips on writing great answers. Connect and share knowledge within a single location that is structured and easy to search. Why main() method must be static in java? We cannot modify the syntax of the main() method. Agree Main () is declared as static as it is directly call by the JVM without creating an object of the class in which the it is declared. This has been done to keep things simple because once the main method is finished executing, java program terminates. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main () method by the JVM. In Java, the main() method plays a vital role in program execution. Java program's main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. The main method is public in Java because it has to be invoked by the JVM. When we run a .class file JVM searches for the main method and executes the contents of it line by line. . So, it is an entry point of a program. correct answer. 32 Java Program | Why main ( ) method is static in each program of java | by Sanjay Gupta. If we need to call a method without instantiation it should be static. JVM introduces the Java program by requesting the main() function. warning? The public static void main(String ar[]) method is the entry point of the execution in Java. The reason main method is static in Java is, so that you can call the main method without the need to create an object of the class in which main method resides. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. On executing, this program generates the following error , Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The ambition to make Java is to build familiarity, security, and portability of data. how long does memory loss last after a concussion why it is Static because apps need a single start point to execute the programme other wise it will confuse which method to start and and any instance of the main program should access only opne entry point. 4:25 min. And, it should be loaded into the memory along with the class and be available for execution. If calling a static method is "easier" than constructing a new object instance and calling a method thereon, however, there isn't really much benefit to requiring that a framework use the more expensive course of action. In this case, main must be declared as public , since it must be called by code outside of its class when the . What is the use of static keyword in main ()? Why is main method static? The Java main() method doesn't return anything, and its return type is void. only one Main method is allowed. Java When the main method is non-static How does the Chameleon's Arcane/Divine focus interact with magic item crafting? The JVM needs to instantiate the class if the main() method is allowed to be non-static. did anything serious ever run on the speccy? Why do we need static methods in Java? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. It's worth looking into static (class) methods vs instance methods, and knowing the difference can be useful at times. The main should be static that it loads first and become your entry point to your program so it's crucial for the main to be static. In Java programming, the main motivation for making a method static is convenience. A main method is static because it is available to run when your program starts and as it is the entry point of the program it runs without creating an instance of the class. Why "this" keyword cannot be used in the main method of java class? Absent such a coordination scheme, however, there's not really much benefit to requiring that the framework construct an application object before running it. If we try to change the name of the method(), it will throw the following error: The Java main() method takes a single argument of type String array as a parameter also referred to as a command-line argument. but we can change its implements. c# why does methods in main need to be static? return an int value. Where does the idea of selling dragon parts come from? Java main method doesn't return anything, that's why it's return type is void. A static method can be called without instantiating an object. Java main () method is static, so that compiler called it without the creation of object or before the creation of an object of the class. But, at the time of execution JVM does not consider this new method (without static) as the entry point of the program. Why main method in java is declared as static? The main() method must contain the public, static, and return types. Thats why the main should be static. No need to declare an instance to call the functions. The main method has to be static so that the JVM can load the class into memory and call the main method without creating an instance of the class first. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Only the static main method can do the job because there is a convention that defines this behavior. A small bolt/nut came off my mtn bike while washing it, can someone help me identify it? If the main () is allowed to be non-static, then while calling the main () method JVM has to instantiate its class. Can We declare main() method as Non-Static in java? Therefore, the main method should be static. Main() is the first point where from compiler start executing the program. How to smoothen the round border of a created buffer to make it look more natural? in a more detailed discussion on Programmers.SE. So if you need a method, which you want to call directly by class name, make that method static. In reference to static void Main(string[] args), we already discussed static. When would I give a checkpoint to my D&D party that they can return to if they die? While JVM tries to execute the Java programs it doesn't know how to create instances of the main class as there is no standard constructor is defined for the main class. There is not another reason. In addition to that, the name Main can be changed to something else. It is an access modifier of the main() method. All rights reserved. Summary: Public because jvm has to see outside from package. Low rated: 3. Java came into existence in 1995. Whenever there is a static keyword besides a variable or function, it belongs to the class itself. If one had a framework which implemented static methods by having them be instance members of a compiler-initialized singleton instance, such an approach might be entirely reasonable, since the framework would have to generate a new object instance before calling the main function in any case. widener university certificate programs. Main () isdeclared as static as it is . What this also means is that you can access this method without having an instance of the class.. There will be a rise in ambiguity(which constructor should be call) in the program when the constructor of the particular class takes the argument. As discussed above, the main() method should be public, static, and have a return type void. Method Main is typically declared with the header: but also can be declared with the header: You can declare Main with return type int (instead of void)this can be useful if an app is executed by another app and needs to return an indication of success or failure to that other app. There is no object of the class available at the time of starting java runtime, and because of that, we have to define the main () method as static. With the execution of the main() function in the program, the RAM is allocated to the task. Java main() method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. The question would . The key point is: the language is defined not to instantiate an object, then call Main on it. What are the criteria for a protest to be a strong incentivizing factor for policy change in China? This return value is used in application Consider a case when static is not mandatory for main (). Java main () method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. 3.If it is allowed for the main () function to be non-static, the JVM must instantiate the class. Why can't static method be abstract in Java? The optional argument string[] args receives the optional "command line" parameters that the program was run with. Whenever Java bytecode is running, JVM cataloging provides the runtime time environment for the Java bytecode. During app startup, when no objects of the class have been created, the Main method must be called to begin program execution. By using this website, you agree with our Cookies Policy. The main method is the one used in the class. Why main method is static in java It's just a convention. What is the Eclipse keyboard shortcut for "public static void main(String[] args) " in Java? In Java whenever we need to call an (instance) method we should instantiate the class (containing it) and call it. Please mail your requirement at [emailprotected] Duration: 1 week to 2 week. while main is key word to indicate the main portion of application from where application is started. Can we call static method in non-static method? In the following example code, the main method is missing the static modifier: Test.java The main method is void in Java because it doesn't return anything to the caller . In both C and Java, memory for arrays is allocated before . It can be declared as a public, private, protected, or internal access modifier. When java runtime starts,there is no object of class present. Static is good for memory management, as it gets memory only once at the time of class loading. Therefore, the main method should be static. Java why it is Static because apps need a single start point to execute the programme other wise it will confuse which method to start and and any instance of the main program should access only opne entry point. Does integrating PDOS give total charge of a system? The main() method is required because the compiler starts executing a program from this entry point. 7,956 views May 8, 2018 68 Dislike Share Save KK JavaTutorials 38.5K subscribers In this video you will talk about Why main Method is static in Java in detail. There is not another reason. The program will be terminated after executing the main() method, and returning anything from the main() method is worthless because JVM will be done nothing for the returned object. I tried to create public void Main() in C#; it says no static void Main found. A static variable is initialized at the commencing of the program, and only a one-time declaration is required. please answer as soon as possible. As David says, you can just add the keyword static to the function definition to change it. So you cannot begin execution of a class without its object if the main method was not static. Moreover, static methods are loaded into the memory along with the class. JVM can call the static methods easily without creating an instance of the class by using the class name only. The main method is static in Java so that it can be called without creating any instance. Should 'using' directives be inside or outside the namespace? Because the object is not required to call the static method. public class Test { public static void main (String . The remainder is void Main(string[] args). Therefore, it is the convention to making the entry method main() static. Why does my setter method say there is no arguments being passed to it (NullPointerException)?,class gamedata { String name; int score; } public class Main { public static void main (String[] args) { gamedata[] data = new gamedata[10]; int userscore = 5; String user. But, not static. However, it is briefly written in the answer. If we make the main method non-static, JVM will have to create its object first and then call main() method which will lead to the extra memory allocation. Why the main method has to be in a java class? In this article, we will answer why main method is static in Java. The current edition is worded differently. How many transistors at minimum do you need to build a general-purpose computer? Can we change the order of public static void main() to static public void main() in Java? It searches for the main method which is public, static, with return type void, and a String array as an argument. In any Java program, the main () method is the starting point from where compiler starts program execution. company.fun() // Class name can directly access the static function. If such a method is not found, a run time error is generated. Let's take an example and understand how the command-line argument works. This is why the main method is static in Java, allowing you to call it without the need to create an object of the class in which it resides. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Which method must be implemented by all threads in Java? It is defined to call a static function. Main method is always static because non-static members or methods should not be called with the class name directly i.e. Static If you declare a method, subclass, block, or a variable static it is loaded along with the class. The Main () method is an entry point of an executable program where the program execution begins and ends. Considering the program security and portability, the word static and final are in use in Java programming. Why the main () method in Java is always static? Main method is static in java because This is just a convention. Making statements based on opinion; back them up with references or personal experience. What are static variables and static functions? We make use of First and third party cookies to improve our user experience. Why is the federal judiciary of the United States divided into circuits? Static is a keyword. Save my name, email, and website in this browser for the next time I comment. Why final variable doesn't require initialization in main method in java? A static method can call only other static methods; it cannot call a non-static method. Why is the Main() method use in C# static? answered Nov 19, 2020 by Editorial Staff (55.8k points) Why is the main method static? In the case of the main method, it is invoked by the JVM directly, so it is not possible to call it by instantiating its class. The main() method is the first method that encounters first during execution. Java main () method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. The language implicates WORA (Write once run anywhere). Why is the main method static? Can virent/viret mean "green" in an adjectival sense? Can we overload static method? CGAC2022 Day 10: Help Santa sort presents! Your email address will not be published. public keyword means public to all which means outside all classes can be accessed. How to execute a static block without main method in Java? You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. It will be difficult for various IDEs (integrated development environment) to identify the launchable classes in the project. Java main () method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. So, if main () is not public in Java, the JVM won't call it. Why main method is static? The runtime instantiates lots of objects before. Why static? 2. Because the object is not required to call the static method. Java program's main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. JavaTpoint offers too many high quality services. The entry point of any Java programme is the main () function. Note: The above is quoted from the 4th edition, now labeled "historical". And, it should be loaded into the memory along with the class and be available for execution. The only thing which we can change is the name of the String array argument. The main () method should be static because it is convenient for JDK (java development kit). By doing that, JVM can load the class into the main memory and call the main() method. There is no object of the class available at the time of starting java runtime, and because of that, we have to define the main() method as static. So there is no point in returning anything, there is nothing that can be done for the returned object by JVM. The Java language designers could have easily decided that you must designate a class to be instantiated, making its constructor the main method. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main() method by the JVM. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? In the context of Java, the static keyword means that the main method is a class method. So, the compiler needs to call the main () method. If any of the following terms are missing, the compilation would take place. so, the compiler needs to call the main () method. A Computer Science portal for geeks. One of the well-establish and most common programming languages is Java. The main method is the entry point of the program. Yes, in .NET, an executable can have only one entry point i.e. To call a non-static method, we have to instantiate or create an object of the class method to call the method (function) of the class using the keyword new. Void in the main method returns nothing. Connecting three parallel LED strips to the same power supply. We make use of First and third party cookies to improve our user experience. Copyright 2011-2021 www.javatpoint.com. Main is sometimes called the apps entry point. these can be called after creating the object whereas main method can be called directly using the class name. The main() method doesn't return anything to make things simple. (TA) Is it appropriate to ignore emails from a student asking obvious questions? Required fields are marked *. If we make the main method non-static, JVM will have to create its object first and then call main () method which will lead to the extra memory allocation. Why main method is static? The main() method is static so that JVM can invoke it without instantiating the class. The main() method is the entry point of each and every Java program. termination (10.2). Tiempo. please answer as soon as possible . But calling a static method is just as effective and doesn't require a class to be instantiated first. It cannot be any other name. Why the main () method in Java is always static? Static It is a keyword that is when associated with a method, making it a class-related method. 7.What is role of 'public static void main (String [] args)' in Java . Take a look at the C# language specification: Application startup occurs when the execution environment calls a What is the term static Signify? Calidad. Learn more. although you can have multiple main m,ethod for which you have to tell compiler which main method is default one while compiling Manish Sati If we omit static keyword before main Java program will successfully compile but it won't execute. Why do people use static methods? If we return something from the main() method, it will throw the following error: It is the name of the main() method. 4. Thanks for contributing an answer to Stack Overflow! There are two types of method within a class: To call a static method (function), we don't need to instantiate or create an object of that method. If we make the main method non-static, 3. designated method, which is referred to as the application's entry The main () method is made static to allow the JVM to load the class into main memory. A Computer Science portal for geeks. In any Java program, the main() method is the starting point from where compiler starts program execution. At run time interpreter is given the class file which has main method, thus main method is entry point for any java program. FAQ related to this article Can we have more than one main method in a class? JVM (Java virtual machine) comes under the category of Abstract machine. Your email address will not be published. 3. I see you did not understand what I said! In fact, even the name main (), and the arguments passed in are purely convention. More Details. Highest rating: 3. . A static method in Java is a method that is part of a class rather than an instance of that class. Your badges and posts will all move over, and . Rate this post Average rating 4.31 /5. Since the static method refers to the class, the syntax to call or refer to a static method is . Why main Method is static in Java? Can We declare main() method as Non-Static in java? We know that anyone can access/invoke a method having public access specifier. In Java, the main() is the entry point for JVM in the program. Only static data may be accessed by a static method. So, the compiler needs to call the main () method. Peso. Subido. Can I add extension methods to an existing static class? Void because it does not . 1. The method name must be Main (). Why can't Java generics be used for static methods? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 4. will lead to the extra memory allocation. The role of adding static before any entity is to make that entity a class entity. 2. The syntax of the main() method is as follows: Let's divide the syntax of the main() method into several parts and understand each one of them: It is not so complicated to understand. Answer: Java main method is static, so that compiler can call it without creation of object or before creation of an object of the class. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Solve Error Could not reserve enough space for object heap. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. In the case of the main method, it is invoked by the JVM directly, so it is not possible to call it by instantiating its class. Why is main method void in Java? The main () method is necessary since this is where the compiler initiates programme execution. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, C# class works without initialization (or call), Why C# has static Main () but C++ has no static main. Consider a case when static is not mandatory for main(). Why would Henry want to close the breach? It means that adding static before methods and variables make them class methods and class variables respectively, instead of instance methods and instance variables. Not the answer you're looking for? Why main method is void in Java? Forget it, @ThomasClayson language designers could have well decided to create an instance of Program and call Main on it. Now, to call any method you need an instance of it. Why main () is declared public and static in Java? Answer (1 of 2): That was just decided as such. void is a data type which returns nothing. In any java program, the main () method is the starting point from where compiler starts program execution. Agree The static is a keyword which we use in the main () method to define it as static. If the main() method wasn't always static, that means that it could be an instance method, which means that it could require an instance of the main class, to be called on. It's a bit "chicken and egg" you can't instantiate an object before you're inside the program. Create Generic method constraining T to an Enum. Why "this" keyword cannot be used in the main method of java class? 4. So, if we define main() method as non-static method, JVM would not be able to call it and throws the following error: As we know that, each method provides some return type such as String, Boolean, Integer etc. Why final variable doesn't require initialization in main method in java? point. By using this website, you agree with our Cookies Policy. Thats why main method has to be static,so JVM can load the class into memory and call the main method. 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