It's important for you to know, "where" your Java files are saved.
The easiest way I compile my files is:
3. I compile my Java file: javac example.java
4. I run my Java file: java example
You can also compile your files from your home directory using the whole path to the file, but I think it�s much quicker and easier to change into the directory and stay there for compiling and executing your Java files.