Mam toPlayer klasa, która implementujeComparable berło. Potem mamArrayList zPlayers. Próbuję użyćbinarySearch() na liściePlayers, aby znaleźć jedenPlayer, ale Java daje mi „cannot find symbol: method binarySearch(java.util.ArrayList< Player>,Player)„

Ta klasa gracza:

class Player implements Comparable {

    private String username;
    private String password;
    Statistics stats;

    //Constructor, creates a new Player with a supplied username
    Player(String name) {
        username = name;
        password = "";
        stats = new Statistics();
    }

    //Accessor method to return the username as a String
    String getName() {
        return username;
    }

    String getPassword() {
        return password;
    }

    void setPassword(String newPass) {
        password = newPass;
    }

    //Method to change the username
    void setName(String newName) {
        username = newName;
    }

    public int compareTo(Object o) {
        return username.compareTo(((Player)o).username);
    }
}

Dziwna rzecz, kiedy próbuję Collections.sort () na tej samej liście, działa.