Java generics warnings on java.util.Collections

Question

I have a method:

public List sortStuff(List toSort) {
    java.util.Collections.sort(toSort);

    return toSort;
}

T

Answer 1

Collections.sort(List) expects that T must implement Comparable. It seems like Stuff does implement Comparable but doesn't provide the generic type argument.

Make sure to declare this:

public class Stuff implements Comparable

Instead of this:

public class Stuff implements Comparable