Because that is what is known as the "entry point" and if it is private, your program will not be able to run. }, "I am main class which contains Given below are the examples mentioned: Now we see a coding example in which the public access modifier is used, and then it is used to add two numbers. The public keyword is an access specifier, which allows the programmer to control the visibility of class members. So just think about it in real world scenarios. Java main method doesn't return anything, that's why it's return type is void. In Java, JVM (Java Virtual Machine) will always look for a specific method signature to start running an application, and that would be the public static void main (String args []). The main method is void in Java because it doesn't return anything to the caller which is JVM. Do NOT follow this link or you will be banned from the site. The main method in java doesn't return anything and has return type void while the main method is C and ++ return int. So that is reason main method is public, it can be accessible everywhere and to every object which may desire to use it for launching the application. What does it mean to invoke static in Java? A public is any group that has an actual or potential interest in or impact on an organization's ability to achieve its objectives. It must be static and it should not be public. If I remember till JDK 1.3 it was not mandatory from developers perspective. 1. JVM launches the java program by invoking the main () method. Why Main Method Is Public And Static In Java? why main() method is declared as public & static ????? Sed based on 2 words, then replace whole line with variable. Thats all about why the main method is declared public and static in Java. public is a key word in Java. Hi Javin, just wanted to thank you for responding to questions from 2016 to 2020 and, I hope, even till now.Good explanation for myself in my opinion.For those who still are not clear on the main method part:Maybe I am oversimplifying things in my head, however the way I see it everything needs to start somewhere and it just so happens for Java that is defined to be at main with the argument specifically being String[]. We are sorry that this post was not useful for you! So, if main () is not public in Java, the JVM won't call it. Because the JLS, Section 12.1.4, says so: The method main must be declared public, static, and void. Connect and share knowledge within a single location that is structured and easy to search. When you declare a method public then it is accessible outside the class (By any other class) 2. when you declare a method private it means that method is visible/accessible only. public static void main(String args[]){ Why Java main method is void specify a formal parameter (8.4.1) whose declared type is array of 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. Are there breakers which can be triggered by an external signal and have to be reset by hand? Does the collective noun "parliament of owls" originate in "parliament of fowls"? Asking for help, clarification, or responding to other answers. If you continue to use this site we will assume that you are happy with it. Teams. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. Iran's attorney general said the country had disbanded its so-called morality police and is considering altering the requirement that women cover their heads in public. Why main method is void in Java? How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? If method is private, JVM wont be able to call it. The Latest Innovations That Are Driving The Vehicle Industry Forward. The main () method represents the entry point of Java programs, and knowing how to use it correctly is very important. Sudo update-grub does not work (single boot Ubuntu 22.04). i.e. In this case, main must be declared as public , since it must be called by code outside of its class when the . Where does the idea of selling dragon parts come from? However, some programmers point out that putting the main() method into its own class can help make the Java components you are creating reusable. We cannot modify the syntax of the main () method. The JVM (Java Virtual Machine) starts its execution by invoking the main method of the specified class, and main() will subsequently invoke all the other methods required by the program. 1. Enforcing the law and preventing criminal activities. There is more information on the initialization and execution of Java programs available in the Java Language Specification. private, protected, and public. Why is the Java main method static keyword? The main method then calls all the other methods required to run your application. In any Java program, the main () method is the starting point from where compiler starts program execution. public static void main(String arg[ ] ) in java is it fixed? As the default access specifier for any method in a class is "private", the above declaration would make the entry point function "Main" as a private method. In Java a function or variable in class in unaccessible untill an Object is created from the class, but the 'main' function is supposed to run at startup(without Object initiation) by JVM. We use cookies to ensure that we give you the best experience on our website. Why main () is declared public and static in Java? static: To call a method we require an object. . You are trying to use a double for the size. Here are few reasons which make sense to me to think of why main is public, static, and void in java. Ready to optimize your JavaScript with Rust? Though ever java programmer uses main method not every one is familiar with reason why main is static or why main is public in Java. Main method is always static because non-static members or methods should not be called with the class name directly i.e. It is the identifier that the JVM looks for as the starting point of the java program. This website uses cookies. Main must be static. Answer (1 of 6): Let discuss access modifiers private and public in context of any method not just main() method. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Why does eclipse require an actual method called 'main'? How to Market Your Business with Webinars? Why the main method is void in Java Why is main method public in Java? Name of a play about the morality of prostitution (kind of). The main method must be declared public, static and void in Java otherwise, JVM will not able to run Java program. The Latest Innovations That Are Driving The Vehicle Industry Forward. If we omit static keyword before main Java program will successfully compile but it won't execute. 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. Not sure if it was just me or something she sent to the whole team. The main method in the Java language is similar to the main function in C and C++. So, a fix was made in subsequent version to enforce rule stated by JLS. String. The main method is static in Java, so the JVM can directly invoke it without instantiating the classs object. This method has been applied to nominal redistricting problems but it generally has less public interest than other types of redistricting reforms. The role of adding static before any entity is to make that entity a class entity. Why Java main method is public static and also has one argument? In fact till JDK 1.3 developer could actually write private main. So the 'main' is declared public as well as static so that it can be accessed outside class & without even an Object is created. Learn Java and Programming through articles, code examples, and tutorials for developers of all levels. The main method in Java is public so that it's visible to every other class, even which are not part of its package. To learn more, see our tips on writing great answers. It means that adding static before methods and variables make them class methods and class variables respectively, instead of instance methods and instance variables. Then we declare that method as static. As Jvm starts execution from main method in java. We know that the main method which serves as an entry point for the application. The only thing I can think of is that to keep it obvious and non-confusing for developers. 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. But, can anyone can explain why it is declared public always? This is very precise explanation. That's all about why the main method is declared public and static in Java. Received a 'behavior reminder' from manager. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? But overall, the main areas for the need for support was indicated, included preparation of effective business plans, sales and marketing techniques and other business networking issues. Fastest way to determine if an integer's square root is an integer. Now, the point is why JLS writer enforced this rule at first place I really have no idea. What ispublic classin the Java language? Why main method is public and static in Java? Why is it so much harder to run on a treadmill when not holding the handlebars? The most common entry point of a C# program is static void Main () or static void Main (String []args). public : "public" is an access specifier which can be used outside the class. Share Improve this answer Which aspect of main() method is not clear? Then we declare that method as static. void : void return type is used when a method does'nt return any value. is not explicitly declared as "public" . The main method is a method which will be called when the program starts. We know that JVM cant instantiate a Java class without calling a constructor method. JVM calls the main() method without creating object by declaring keyword static. 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, if main() is not public in Java, the JVM wont call it. Here is small example of little java class with main method : [code]public class A //The class name is in you control { public A(int param1, int param2) //. System.out.println("I am main class which No votes so far! Richard Frankel (Massachusetts Institute of Psychoanalysis [MIP]) and Victor J. Krebs (Pontificia Universidad Catlica del Per [PUCP]) and VJK Curaduria Filosofica) Human virtuality and digital life: Philosophical and psychoanalytic investigations This book is a psychoanalytic and philosophical exploration of how the digital is transforming our perception of the world and our understanding . This method will be executed when the application starts. Refer: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why can't I define a static method in a Java interface? How to round a number to n decimal places in Java. We should use a public keyword before the main () method so that JVM can identify the execution point of the program. According to an answer on stackoverflow, It is declared as static, "The method is static because otherwise there would be ambiguity: which constructor should be called?". 3. Should I give a brutally honest feedback on course evaluations? I think you can find more info here: Why main method is public. 2. static : To call a method we require object. In both C and Java, memory for arrays is allocated before . But it's not only for Java. The main method is public in Java because it has to be invoked by the JVM. 4 What does it mean to invoke static in Java? main: It is the name of Java main method. Examples of frauds discovered because someone tried to mimic a random sequence. One is the main () in which we create an object of Addition (), and then we call the other class through two numbers. This line declares a class named Main , which is public , that means that any other class can access it. What is the difference between public, protected, package-private and private in Java? So the 'main' is declared public as well as static so that it can be accessed outside class & without even an Object is created. The main method is static so that it can be called without being created. Thanks for contributing an answer to Stack Overflow! What does "Could not find or load main class" mean? @drorb what if we do not make it public? Static is a keyword. The main method is static in Java so that it can be called without creating any instance. @OliCharlesworth What is the reason by the way? Here are 25 ways police officers serve their communities: Responding to calls for police service. We use cookies to ensure that we give you the best experience on our website. If such a method is not found, a run time error is generated. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Static is a keyword. That's all about why the main method is declared public and static in Java. If it is not public JVM classes will not be able to access it. You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. Can we run main method without static? If you continue to use this site we will assume that you are happy with it. The Java compiler or JVM looks for the main method when it starts executing a Java program. There can only be one entry point in a C# program. Main method in Java is public so that JVM can easily access it, as JVM needs to load the class and call the main method of the class. Why don't Java's +=, -=, *=, /= compound assignment operators require casting? Still . The JVM executes the main method using native API and java visibility concept does not apply here. Why main method is public and static in Java? rev2022.12.9.43105. Q&A for work. Enter your email address to subscribe to new posts. What is static in public static void main in Java? Investigating crimes. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? contains the main method"); Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? void: In Java, every method has the return type. A method is package-private if it has no access-modifier specified. Therefore, it is the convention to making the entry method main . Hello @Anonymous, that's sad, how can I help you? Sometimes it may be required to call a method without the help of object. Public - Access modifier is public so that main method is visible to every other class, same package or other. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Coming soon, the Groundbreakers Developer Community will be migrating to Oracle Forums for a refreshed experience. 1 Answer Sorted by: 45 public - The main method is called by the JVM to run the method which is outside the scope of the project therefore the access specifier has to be public to permit a call from anywhere outside the application. A small bolt/nut came off my mtn bike while washing it, can someone help me identify it? - On Secret Hunt 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 a standard method and has a pre-specified signature if you change the signature of the main method JVM will not be able to locate the main method will throw Exception at runtime as shown in the above example. Why is the main method always public and static? It must This has been done to keep things simple because once the main method is finished executing, java program terminates. However, it is briefly written in the answer. static: You can make a method static by using the keyword static. This post will discuss why the main method is declared as public and static in Java. So, it is an entry point of a program. I believe, the rational behind enforcing main as public is more to do with the language specification rather than whether something could be achieved or not. Yes the standards say so that main method should be public in Java. http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.1.4. This has been done to keep things simple because once the main method is finished executing, java program terminates. main() method does'nt return any value, so main() is declared as void. why main() method is declared as public & static ????? An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. Maintaining public order. The main method is required to be declared at the start of the code. The syntax of the main () method is: public: It is an access specifier. why main method can't be of default scope? To make Java a little less verbose than it already is, the main method is static in Java. An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. The syntax of the main () method is as follows: public static void main (String [] args) { } Then we declare that method as static. Summary: 1. For example, the design below creates a separate class for the main() method, thus allowing the class ServerFoo to be called by other programs or methods: Elements of the Main Method. When the Java interpreter executes an application (by being invoked upon the application's controlling class), it starts by calling the class's main method. Why this rule not applicable for main() method (public static void main(String a )). Java visibility concept does not apply to JVM - As JVM can access any method irrespective to its access level defined. if its not public JVM classes might not able to access it. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Mediating disputes. Got other things but can you explain the reason why was the need to make the main method parametric with a single dimension String array. JVM calls the main() method without creating object by declaring keyword static. 1 Why main method is public and static in Java? We know that anyone can access/invoke a method having public access specifier. Popular Search Warning Apt Does Not Have A Stable Cli Interface Use With Caution In Scripts Water Jug Problem Python Was Preloaded Using Link Preload But Not Used Within A Few Seconds From The Windows Load Event Please Make Sure It Has An Appropriate As Value And It Is Preloaded Intentionally Worst Fit Memory Allocation Program In C Write A Function Class Solution Public . Declaring this method as public allows the JVM to start the code execution. 5 What ispublic classin the Java language? Problems with this method arise when minor parties are shut-out of the process which will reinforce the two-party . The Main method can be declared with or without a string [] parameter . But I found that it was reported as a bug by developers across world: Please refer: http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4155575. Main can either have a void or int return type. If the main() is allowed to be non-static, then while calling the main() method JVM has to instantiate its class. So, if main() is not public in Java, the JVM wont call it. We can identify seven types ofpublics. Is there a verb meaning depthify (getting more depth)? Though every java programmer uses the main method not everyone is familiar with the reason why the main is static or why the main is public in Java. Hello @Unknown, can you post your code, it may be possible that your main method has wrong syntax and that's why Java compiler is complaining. Can you please let me know, I'll try to make it clear. if it's not public JVM classes might not able to access it. Why is processing a sorted array faster than processing an unsorted array? (Libraries and services do not require a Main method as an entry point.) The first word in the statement, public, means that any object can use the main method.The first word could also be static, but public static is the standard way. Protecting victims. The only thing which we can change is the name of the String array argument. The application may be Console Application or Windows Application. 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. What are the expressed powers of the president quizlet? The main method is public in Java because it has to be invoked by the JVM. 2. Having an access modifier as public means method can be accessed from classes in the same package and from other packages too. Hence, it is one of the most important methods of Java and having a proper understanding of it is very important. But, at the time of execution JVM does not consider this new method (without static) as the entry point of the program. Making statements based on opinion; back them up with references or personal experience. In any Java program, the main () method is the starting point from where compiler starts program execution. void : void return type is used when a method does'nt return any value . We should call the main () method without creating an object. Since the main method in Java is not supposed to return any value, its made void which simply means main is not returning anything. Public - main method is called by JVM to run the method which is outside the scope of project therefore the access specifier has to be public to permit call from anywhere outside the application. When the application is started, the Main method is the first method that is invoked.. The I-cut-you-choose concept was popularized by the board game Berrymandering. The class that contains the main method can have any name, although typically you can just call the class Main. So, the compiler needs to call the main () method. Main is declared inside a class or struct. So there is no point in returning anything, there is nothing that can be done for the returned object by JVM. There are ways to call a private method as well (eg by using Reflection), but that is not a standard way to do things. Your badges and posts will all move over, and all . 1. Answer (1 of 60): As you already must have figured out by now is that the 'main' method you are talking about is entry point of your code. The main method is static in Java so that it can be called without creating any instance. Therefore, either of the following declarations is acceptable: Java uses JNI launch java application will never have any issue in calling a private main but this is more like jail-brake (like another jail-brake, where reflection API let you access private method) and definitely not in spirit of java specification. The main () is the starting point for JVM to start execution of a Java program. 'Must Override a Superclass Method' Errors after importing a project into Eclipse. Why is char[] preferred over String for passwords? My question is , if the "Main" method is private how is the runtime going to invoke this static function ?? If the main method is non-static, then JVM needs to create an instance of the class, and there would be ambiguity if the constructor of that class takes an argument which constructor should be called by JVM and what parameters should be passed? See my answer below for details. When main method is declared public it means it can be used outside class. 3 Why main () is declared public and static in Java? The enclosing class or struct is not required to be static. For example: public class Main { public static void main (String args []) { // your . If we omit static keyword before main Java program will successfully compile but it won't execute. Why main () is declared public and static in Java? I know we can use it as a CLA and save space of an extra variable, but why it was so necessary to put it there? main method in Java is public so that its visible to every other class, even which are not part of its package. The main () method is the first method that encounters first during execution. these can be called after creating the object whereas main method can be called directly using the class name. Financial publics influence the company's ability to obtain funds. We are forced to write main method as public. 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. Here we'll talk about the main method and the necessity to mark main method as static in Java. So there is no point in returning anything, there is nothing that can be done for the returned object by JVM. By using this site, you agree to the use of cookies, our policies, copyright terms and other conditions. February 8, 2022 JBT 76 Comments. public class Test { public static void main (String . Java programs 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. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? And static so that It can be accessed without creating the instance of the class in which Main method has been defined. Why Java main method is marked public. :(. Hello @Unknown, what is your doubt? The main method in Java is public so that it's visible to every other class, even which are not part of its package. There are two classes. 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. please answer as soon as possible. JVM calls the main() method without creating object by declaring keyword static. So, the compiler needs to call the main() method. When the main () method is declared public it means it can be used outside the class. 6 Can a class contain the main method in Java? It must specify a formal parameter (8.4.1) whose declared type is array of String. If you have a specific doubt we may be able to explain you better. Coming to main method signature it is easy to see that main method is-. The Main method is the entry point of a C# application. The main () method should be static because it is convenient for JDK (java development kit). If it's not public, then it won't be found; you'll get. On Main () and Command Line Arguments (C# Programming Guide) , there is a statement: It (the Main method) is declared inside a class or struct. even a private main was being accepted by JRE. Why is the main method in Java qualified as public static and void? I have a question that why main method is marked as public? Feel free to comment, ask questions if you have any doubt. Thank you @Emtiaz, glad that you find these questions and explanations useful. Consider a case when static is not mandatory for main (). This is one of the most important fundamentals of the Java programming language and every Java programmer should be familiar with it. Thats all about why the main method is declared public and static in Java. Learn more about Teams Static methods are the method which invokes without creating the objects, so we do not need any object to call the main () method. However even for C#, main must be public. Though, it was not inline with JLS 1.3. We know that anyone can access/invoke a method having public access specifier. Other barriers they encountered were competition, bureaucratic procedures, recognition of qualifications, individual expectations, communications and . The method main must be declared public, static, and void. Connect and share knowledge within a single location that is structured and easy to search. In this article. Then we declare that method as static. I wish i read that before the interview i gave yesterday. Public and Static Methods. Did neanderthals need vitamin C from the diet? The main method is public in Java because it has to be invoked by the JVM. Before the main method is called, no objects are instantiated. Sometimes it may be required to call a method without the help of object. Which is an example of public access in Java? By making any variable, methods or class as public ( by prefixing it ), you make that thing available/accessible to others programs/softwares , outside the Java source code in which it lies/belongs. It will be difficult for various IDEs (integrated development environment) to identify the launchable classes in the project. Its not a keyword. The main method is public, static, and void and accepts a String[] as an argument and from Java 5 onwards it can also accept. 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. The main () method is public, static, and void in java because: public: "public" is an access specifier which can be used outside the class. In Java programs, the point from where the program starts its execution or simply the entry point of Java programs is the main () method. (In the example above it receives the default access of private.) Main has been declared as Public as it can be accessed globally. void indicates that the main () method is declared does not return a value. The main method can contain code to execute or call other methods, and it can be placed in any class that's part of a program. When we run a .class file JVM searches for the main method and executes the contents of it line by line. I tried searching JLS 1.3 for a reference, but could not get a link. So, if main() is not public in Java, the JVM wont call it. If you come from C and C++ programming language then you know what is the main method as both of these programs also use main() as an entry point for program execution but the main method in. In this case, main must be declared as public , since it must be called by code outside of its class when the program is started. Is it appropriate to ignore emails from a student asking obvious questions? The main method is public in Java because it has to be invoked by the JVM. Having the static keyword means the method can be called without creating any objects first. How to Market Your Business with Webinars? This is a very famous core Java interview question and appeared on many fresher and experience level interviews. { 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. C# applications have an entry point called Main Method. Why is main method public and static in java? 2. In Java a function or variable in class in unaccessible untill an Object is created from the class, but the 'main' function is supposed to run at startup (without Object initiation) by JVM. Main method not found in class Student, please define the main method as: public static void main(String[] args)or a JavaFX application class must extend javafx.application.Application. . When main method is declared public it means it can be used outside class. In contrast, the main method of Java MUST be public. static: To call a method we require object. Following points explain what is static in the main () method: main () method: The main () method, in Java, is the entry point for the JVM (Java Virtual Machine) into the java program. Also, the class must not be abstract; otherwise, the JVM could not instantiate it. The main method in Java is public so that it's visible to every other class, even which are not part of its package. 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. Since the main method is public in Java, JVM can easily access and execute it. Conducting patrols. Why main () is declared public and static in java public - The main method is called by the JVM to run the method which is outside the scope of the project therefore the access specifier has to be public to permit a call from anywhere outside the application. 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. Why main method is public? Main door is the only publicly available access point. the main method". One also understands the structure of . The public static void main (String ar []) method is the entry point of the execution in Java. Sometimes it may be required to call a method without the help of object. Because the main method should be accessed by JVM without any restrictions from any where. When the code is executed, a JVM will be created and that will act as a container for the code we are trying to execute. JVM calls the main() method without creating object by declaring keyword static. Be the first to rate this post. Main () isdeclared as static as it is . The method contains the code that is used to run the program. Java main method doesnt return anything, thats why its return type is void. 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 method or variable which is declared public in Java can be accessed from outside of that class. We know that anyone can access/invoke a method having public access specifier. please answer as soon as possible. The initialization software that starts your program must be able to see main so that it can call it. Why static? More complex programs usually have a class that contains only the main method. Can a class contain the main method in Java? Directing traffic. Look at the below java program example, main () method is declared public static void in a class called Test. Read our. So, if main () is not public in Java, the JVM won't call it. you want to enter your room, but you should enter your home main door first (given room is inside the houseand no other means to enter the house). if it's not public JVM classes might not able to access it. E.g. We can agree upon a default constructor, but thats extra overhead. Without the main () method, JVM will not execute the program. The main method is static in Java so that it can be called without creating any instance. public class Main { In Java, every line of code that can actually run needs to be inside a class. Why the main method is public in Java Java specifies several access modifiers e.g. It is the first method which gets invoked whenever an application started and it is present in every C# executable file. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Understanding static in public static void main in Java. Find centralized, trusted content and collaborate around the technologies you use most. if it's not public JVM classes might not able to access it. Why is main method public in Java? The main method is public in Java because it has to be invoked by the JVM. Rate this post This question is answered in detail in the video. http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.1.4, http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4155575. 2. Why is subtracting these two times (in 1927) giving a strange result? JVM launches the java program by invoking the main () method. Why main() method is public static void main(String[] args) in Java? The Main method is the entry point of an .exe program; it is where the program control starts and ends. 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