A DESCRIPTION OF THE PROBLEM :
While I am reading the Documation on Generics topic (Interoperating with Legacy Code) in official page. I found a minor syntax issue on creating LinkedList object. please find the link of document and the piece of code which has error below.

https://docs.oracle.com/javase/tutorial/extra/generics/legacy.html

public String loophole(Integer x) {
    List ys = new LinkedList; //error line missing parenthesis
    List xs = ys;
    xs.add(x);
    return(String) ys.iterator().next(); // run time error
}