I have removed a lot of blank lines from your code. there is no need for blanks after every line; in fact I think that makes the code harder to read.
Actually I would move the main method out of that class altogether. Put it into another class, maybe ListDemo
You should add lots more code to the start method, to demonstrate your List working. If you are not familiar with command‑line arguments, start
here. You can run it like this:-
javac ListDemo java
java ListDemo Campbell is no help at all when you run into trouble
The parameter args now receives a
String[] {"Campbell", "is", "no", "help", "at", "all", "when", "you", "run", "into", "trouble}