Java main() method


	Lesson 4 Objective	The main() method Main() method as an entry point
		The main() method Use of the main() method as an entry point. The `main()` method is the entry point for a Java program. It is the first method that is invoked when a Java program is run. A correctly defined `main()` method has the following signature: Naming context :A context or scope in which identifiers are unique. Signature: The name of the method and the number and types of formal parameters to the method. main method on the exam public static void main(String[] args) { // The statements of the method are placed here. } The modifiers `public` and `static` , and the `void` return type must precede the `main()` method name. The `main()` method has a single argument that is an array of `String` objects. The `args` identifier is used by custom as the argument name. However, any other valid identifier may be used in place of `args` . Modifier: A keyword that is used to modify the definition of a class, variable, method, or constructor. Only Java application programs need a main() method. Applets are not required to have a main() method since they are executed by browsers within the context of a Web page. The argument of the `main()` method provides access to the program's command line arguments. For example, suppose that a program is invoked with command line arguments of `abc` , `def` , and `ghi` . Then `args[0]` would reference the String `"abc"` , `args[1]` would reference `"def"` , and `args[2]` would reference `"ghi"` . The MainTest program provides an example of using the `main()` method to access command line arguments.