The method is static because otherwise there would be ambiguity: which constructor should be called? If the main() method is not found, it gives error.A program that does not have the main() method gives an error at run time.We can interchange public and static and write it as follows:We can also use the different name for the String type array and write it as:A program that has no main() method, but compile and runs successfully.We can also overload the main() method. © Copyright 2011-2018 www.javatpoint.com. À partir de la version 5 de Java ces blocs sont exécutés lors de la première instanciation de la classe Capitaine. Also, if by convention we use @Namratha: Yes, you're missing something. I actually would have preferred an answer from one of the people originally involved – but that was a very far shot. In the usual This is the best answer here. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. As the entry point into a program, the main() method has an important place, but programmers do not all agree on what it should contain and to what degree it should be integrated with other functionality. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesJava is deliberately designed to look familiar to a C programmer. Developed by JavaTpoint. Here is how we can create objects in Java: className object = new className(); Here, we are using the constructor className() to create the object. is often used for better organization of classes (one class has all the attributes and methods, while the other class holds the Remember that the name of the java file should match the class name. "Instance" is an isolated, living and breathing autonomous generation of that class.It is just a convention. The main() is the starting point for JVM to start execution of a Java program. This I think the best you will get is "That's how they wanted it". But object is constructed rather than invocation as a result we use the static key word in the main method. Having it static also lets it be loaded and executable into the JVM at runtime. methods. Using Multiple Classes. You, as the developer, turn the application into an object-oriented solution by creating instances of your objects and depending upon the code compiled within.Object-oriented is great for millions of obvious reasons. This causes the specified class to be loaded (§2.17.2), linked (§2.17.3) to other types that it uses, and initialized (§2.17.4). Without the main() method, JVM will not execute the program. Your application is running at this point, even without any objects being declared (remember, there's procedural AND OO coding patterns). By using our site, you acknowledge that you have read and understand our Because Java is all Objects, it has to be static to avoid object instantiation. The correct statement is: "Every static method must provide an object when using any non-static method". When JVM calls the main method of the class (say, Person). Generally, the main() method parses any command line arguments, does some setup or checking, and then initializes one or more objects that continue the work of the program. The main() is the starting point for JVM to start execution of a Java program. It must specify a formal parameter (§8.4.1) whose declared type is array of String. It's a shame that many users will only read the top 2 or 3 answers on the page; and this one is unlikely to get there any time soon. Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications.

The Java virtual machine then links the initial class, initializes it, and invokes Funny thing, in the JVM specification it's not mention that the main method has to be static. Stack Overflow works best with JavaScript enabled My understanding of Java is fairly basic, but I have heard the above reason (from professors, textbooks, etc) and never any other. And it is recommended to set it as static for code maintainability/re-usability. But it must be called from scratch, without constructing the object first, since it is usually the task of the main() function (bootstrap), to parse the arguments and construct the object, usually by using these arguments/program parameters.All Java applications, except applets, start their execution from Similarly, we use static sometime for user defined methods so that we need not to make objects.Applets, midlets, servlets and beans of various kinds are constructed and then have lifecycle methods called on them. The modifiers public and static can be written in either order (public static or static public), but the convention is to use public static as shown above. My point is about forcing Ah. The syntax of the main() method is: public: It is an access specifier. No. Voici deux exemples (un programme console, et une applet) permettant d'avoir un aperçu de ce à quoi peut ressembler un programme Java.

It's an extraordinary claim that you have Java textbooks and professors that think what you claim and frankly I don't believe they do. With a static main, all you need to know to invoke a Java program is the name and location of a class. (Any references? Once defined this new type can be used to create object of that type. Free 30 Day Trial

An object is called an instance of a class. Paul Leahy is a computer programmer with over a decade of experience working in the IT industry, as both an in-house and vendor-based developer.Example Java Code For Building a Simple GUI Application Here is the Note that the main() method is defined within curly braces and is declared with three keywords: public, static and void :Now let's add some code to the main() method so that it does something:This is the traditional "Hello World!"