In Java, you can have just one public static void main(String args) per class. Which mean, if your program has multiple classes, each class can have public static void main(String args) . See JLS for details. A class can define multiple methods with the name main.
Yes. While starting the application we mention the class name to be run. The JVM will look for the main method only in the class whose name you have mentioned. Hence there is not conflict amongst the multiple classes having main method.