why computer reads from main??

Answer 1

It is supposed to be done. If there is no such indicator like main function, how compiler knows where to begin?

Answer 2

Main method is a special method, is the entrance of the program execution, a Java program from the main method begins execution. Java virtual machine prior before assigning a thread to execute Java program, and our main method is executed by the primary thread.And it's ok not understand it.Just go on.