Can we execute a class without a main method in java?

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 happens when I run a class which has no main method?

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.

Can we compile java without main?

Yes, We can Compile and Execute a java program without Main function. Instead of that we can use static block to compile and Execute the program.

Can we execute any code even before the main method?

Answer: No since JDK 1.7 it is not possible to execute any java class without main() method.

Can Mcq program run without main function?

No you cannot unless you are writing a program in a freestanding environment (embedded environment OS kernel etc.)

Can we run spring boot without main method?

In short, Yes, you can run a Java program without a main method in a managed environment like Applet, Servlet, and MIDlet, which runs under control of browser, server, and mobile device, but can’t run a core Java program without public static void main(string args[]){} method.

Can we achieve inheritance with polymorphism?

flexible programs focus on polymorphism and not inheritance . inheritance and polymorphism are independent but related entities – it is possible to have one without the other.

Why do we need a main method in Java?

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. 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.

Can we create a program without main method Javatpoint?

A program that does not have the main() method gives an error at run time. So the main() method should always be written as: public static void main(String args[])

How we can execute any code even before main method in Java?

One of the options is to use static function as initializer to static variable. Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method.

Is it possible to execute code even after the program exits the main () function?

The simple answer is no. But you can always start a new thread at the end of the main and it will execute even after the main has completed.

Can we execute a program without main method in Java?

Can we execute a java program without a 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.

Is it possible to compile and execute a class without main method?

But there’s no point in doing that. Then if you try to run the class (either form command line with java Test or with an IDE), the result is: Yes You can compile and execute without main method By using static block. But after static block executed (printed) you will get an error saying no main method found.

Can we compile and execute without main method by using static block?

So, if there’s code in a static block, it will be executed. But there’s no point in doing that. Then if you try to run the class (either form command line with java Test or with an IDE), the result is: Yes You can compile and execute without main method By using static block.

Does Java need a main method to compile?

Something you may find interesting: although the source code compiled by the Java compiler does not need a main method, the source code for the Java compiler itself does have a main method. There is a difference between running and compiling. Java code can be compiled incrementally. You only need a main somewhere to run the code.