No, with Java 7 onwards, you need a main() method to execute a

program. 

In earlier versions of Java, there was a workaround

available to use static blocks for execution.

 But now this gap has been closed

https://www.tutorialspoint.com/can-we-execute-a-java-program-without-a-main-method#:~:text=Yes%2C%20we%20can%20execute%20a,by%20using%20a%20static%20block.