private class myTimerTask extends TimerTask {
    private Connection con;

    public myTimerTask(Connection con) {
        this.con = con;
    }

    public void run()
    {
        this.con.sendHeartbeat();
    }

    public Connection getCon() {
        return con;
    }
    public void setCon(Connection con) {
        this.con = con;
    }
}

class Connection {
    private int type;
    private Timer connectionTimer;
    private Socket sock;

    //... Constructor

    public void activateConnection (int connectionType) {
        this.type = connectionType;

        this.connectionTimer.schedule(new myTimerTask(this), 60);
    }

    public void sendHeartbeat() {
        switch (type) {
            case 0: socket.sendSignOfLife(1); break;
            case 1: socket.sendSignOfLife(2); break;
            case 2: socket.sendSignOfLife(3); break;
            default: socket.sendSignOfLife(0);
        }
    }

    //... Getters & Setters
}