Is empty .java file name a valid source file name?

Question

Please help me with a sample program to check whether given matrix is valid sudoku solution or not. Input would be matrix of n*n size and validate grids of sqrt(n)*sqrt(n) size along with row and columns.

Answer 1

Yes, save your java file by .java then compile it by javac .java and run by java yourclassname

 class X { 
        public static void main(String args[]) {
            System.out.println("Hello World");
        } 
    } 

to compile - javac .java

to execute - java X

Credits : https://stackoverflow.com/questions/29827900/is-empty-java-file-name-working