Why the main () method in Java is always static?

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.

• In any Java program, the main() method is the starting point from where compiler starts program execution. So, the compiler needs to call the main() method.
• If the main() is allowed to be non-static, then while calling the main() method JVM has to instantiate its class.
• While instantiating it has to call the constructor of that class, There will be ambiguity if the constructor of that class takes an argument.
• Static method of a class can be called by using the class name only without creating an object of a class.
• The main() method in Java must be declared public, static and void. If any of these are missing, the Java program will compile but a runtime error will be thrown.

Example

class Book {
   public static void getBookInfo() { //static method
      System.out.println("Welcome to TutorialsPoint Library");
   }
}
public class Test {
   public static void main(String[] args) {
      //Call static method of Book class using class name only
      Book.getBookInfo();
   }
}

Output

Welcome to TutorialsPoint Library

Raja

Published on 06-Jun-2019 14:33:00

• Related Questions & Answers
• Why is the Main() method use in C# static?
• Why main() method must be static in java?
• Can We declare main() method as Non-Static in java?
• Is main method compulsory in Java?
• Why the main method has to be in a java class?
• How to execute a static block without main method in Java?
• Can we change the order of public static void main() to static public void main() in Java?
• Why singleton class is always sealed in C#?
• Why can't static method be abstract in Java?
• Why is __init__() always called after __new__() in python?
• Java static method
• Why final variable doesn't require initialization in main method in java?
• Why "this" keyword cannot be used in the main method of java class?
• Can we overload the main method in Java?
• Can we override the main method in java?