eclipse - Unable to view complete java source code in IntelliJ - Stack Overflow
Debugging java source file with multiple classes in eclipse: Source not found - Stack Overflow
How to Create a Class File in Java - Javatpoint
Java and JMLfor Dummies” The Java source code is written in a text file using your favourite editor (Notepad) and is saved with extension.java. Be careful. - ppt download
I open a Java source file in Eclipse and it opens in the default Windows handler app - Super User