What is the error, I cant figure out

Question

Create a Java interface containing the operations: (1) insert, (2) delete, (3) isEmpty, (4) size, (5) update, and (6)search.
Write a Java class definition that implements the interface created using singly linked linear list.
https://code.sololearn.com/cvo03snLbLrn/?ref=app

Answer 1

Where is your interface definition
main method is also not there

Answer 2

According to your description, first create an interface then implement those interface in a class..