Java：如何从包含更多参数类型的列表中仅返回一种参数类型的对象？

Question

I have this List that stores objects of type Team (sport teams) and I want to display the ranking of all teams of the same type:

static List<Team> teams = new ArrayList<>();

Team class is generic, it accept parameter types of some clases like: Fotbal, Basketball, etc.

With the following method I wish to display the ranks of teams of one type, for ex. to display all fotbal teams ranking:

static  void classament() {
        Collections.sort(Championship.teams);
        for (Team i : teams) {
            System.out.println(i);
        }
     }

In this state the method return all teams irrespective of the type of sport.

This is my Team class declaration:

public class Team<T extends Player  > extends Championship implements Comparable<Team<T>>{

}

Answer 1

You could use the instanceof keyword like this:

if (team instanceof BasketballTeam) {
    System.out.println(team);
}

and this would work. But maybe a team should just be a generic object with an enum field storing its type? Then you could compare it with

if (team.getType() == BASEBALL)