Can we run Java without main method?
Yes, we can execute a java program without a main method by using a static block. Static block in Java is a group of statements that gets executed only once when the class is loaded into the memory by Java ClassLoader, It is also known as a static initialization block.
What will happen if I will not provide the main method in my Java file?
If your program doesn’t contain the main method, then you will get an error “main method not found in the class”. It will give an error (byte code verification error because in it’s byte code, main is not there) not an exception because the program has not run yet.
Does main method need to be in a class?
It is not necessary for all the classes to have a main method. main method is used as an entry point for java applications. So once you have entered the java code using main method of a single class you can call other classes code form there.
Why do we write main method in Java?
The main() method is static so that JVM can invoke it without instantiating the class. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main() method by the JVM. Void: It is a keyword and used to specify that a method doesn’t return anything.
Can we override the main method?
No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object.
Can we have 2 main methods in Java?
A class can define multiple methods with the name main. The signature of these methods does not match the signature of the main method. These other methods with different signatures are not considered the “main” method. Yes it is possible to have two main() in the same program.
Can a main () method be declared final?
The short answer is Yes. You can declare main method as final. without any compile error.
Why is String args used in Java?
The String args parameter is an array of Strings passed as parameters when you are running your application through command line in the OS. The java -jar command will pass your Strings update and notify to your public static void main() method. You can also have the syntax below as well.
Can I call Main method from another class?
Though Java doesn’t prefer main() method called from somewhere else in the program, it does not prohibit one from doing it as well. So, in fact, we can call the main() method whenever and wherever we need to.
Why does an applet have no main method?
Applets and Servlets do not start their own process. Instead they run inside a container. Therefore, they do no need a static main method (which starts the process), but a way to interact with their container.
How does JVM find main method?
A Java virtual machine starts execution by invoking the method main of some specified class, passing it a single argument, which is an array of strings. In the examples in this specification, this first class is typically called Test .