Java 流中的If语句

是否可以在下面的地图中使用if语句条件

public Map<LocalDate, Double> avarageTemperatures(LocalDate dateFrom, LocalDate dateTo) {

    Map<LocalDate, Double> tempAverage = Data.stream()
            .collect(Collectors.groupingBy(Weather::getDateTime,
                    Collectors.averagingDouble(Weather::getTemp)));

    System.out.println("average: " + tempAverage);
    return tempAverage;
}

其中

weatherData

是一个包含日期和温度的数组列表。我的天气课：

public class Weather {
    private LocalDate dateTime;
    private LocalTime time;
    private double temperature;
    private String tag;
    //setter, getter, constructor 
}

日期为1946-01-15，温度为-0.3。您可以使用：

public class Weather {
    private LocalDate dateTime;
    private LocalTime time;
    private double temperature;
    private String tag;
    //setter, getter, constructor 
}

weatherData.stream().filter(weather -> !weather.getDateTime().isAfter(dateTo) &&
                                    !weather.getDateTime().isBefore(dateFrom))...