The main() method is a special method in Java that serves as the entry point of a Java application. When you run a Java program, the JVM (Java Virtual Machine) calls the main() method to start the execution of the program.
The main() method must be defined as follows:
public static void main(String[] args)
The public keyword indicates that the method can be accessed from anywhere in the program.
The static keyword indicates that the method belongs to the class rather than to an instance of the class.
The void keyword indicates that the method does not return a value.
The parameter String[] args is an array of strings that contains any command-line arguments passed to the program.
The main() method can contain any Java code necessary for the program's execution. Typically, the main() method initializes the program's data structures and objects, performs any necessary computations, and prints output to the console or to a file.
The main() method can throw exceptions, which can be caught and handled by the program or propagated up to the JVM.
The main() method is not required for all Java programs. For example, programs that run as applets or as servlets in a web container do not have a main() method.