“Main method not found” error when starting program? [duplicate]

Answer 1

What you have currently is just a constructor named Main, what Java needs is a main method with exact signature as:

public static void main(String[] args)

• public - so that it can be called from outside

• static - so that no need to create an instance of your class

• void - not going to return any value

• args - an array for command line parameters that you can specify while running the program

This is the entry point for your application.

When your current code is being invoked, JVM is trying to locate main method, and since its not present in your code, it's throwing the exception which you have received.

Since you have mentioned beginner in your post, its worth mentioning that Java is a case sensitive language - main and Main are not same in Java.

See also: The getting started tutorial.

Answer 2

As the rather helpful error message states, you need a main method. See the java tutorials.

Answer 3

You need add a main method in your main class so that JVM will know where to start from and not a class with a "main" name.

public static void main(String[] args) {
   new Main();
}

Answer 4

You have to use main() method in your program. From here the program execution starts.

like

public static void main(String args[])
{
  //This is the starting point of your program.
}

This method must appear within a class, but it can be any class. In the Java language, when you execute a class with the Java interpreter, the runtime system starts by calling the class's main() method. The main() method then calls all the other methods required to run your application.

The main() method accepts a single parameter: an array of Strings. This parameter is the mechanism through which the runtime system passes command line arguments to your application

Answer 5

The correct signature of main is:

public static void main(String[] args) {
   new Main();
}

It's even written in the error message you posted.

Remove the ; from the constructor:

public Main() {
    run();
}

Answer 6

main method should exist for your application to run. Java applications need it to know where to begin executing the program.

Put the method in a class of your choice, and then right click file and select 'Run file`.

 public static void main(String[] args)
 {
     // your code here
 }