Question

is Empty .java file name a valid source file name?

Answer 1

Yes, Java allows to save our java file by .java only, we need to compile it by javac .java and run by java classname Let's take a simple example:

1. //save by .java only  
2. class A{  
3. public static void main(String args[]){  
4. System.out.println("Hello java");  
5. }  
6. }  
7. //compile by javac .java  
8. //run by     java A  

compile it by javac .java

run it by java A