is empty .java file name a valid source file name? by Yes, save your java file by .java then compile it by javac .java and run by java yourclassname class Test { public static void main(String args[]) { System.out.println("Hello World"); } } class Test { public static void main(String args[]) { System.out.println("Hello World"); } }to compile: javac .java to execute: java Test Please Share