请根据观察者模式，用Java语言设计并实现气象站程序。其中，部分代码已经写好，包括： • 观察者接口 • 主题接口 • 显示板接口 • 测试程序 请在此框架下，继续完成CurrentConditionsDisplay、ForecastDisplay、StatisticsDisplay等显示板类， 以及气象数据类（WeatherData）， 使程序最终运行结果如下图所示（XXXX为本人学号）： Currents conditions:80.0F degress and 65.0% humidity (by 1508060330) Avg/Max/Min:temperature = 80.0/80.0/80.0/ (by 1508060330) Forecast (by 1508060330):improving weather on the way Currents conditions:82.0F degress and 70.0% humidity (by 1508060330) Avg/Max/Min:temperature = 81.0/82.0/80.0/ (by 1508060330) Forecast (by 150806033 0):watch out for cooler,rainy weather Currents conditions:78.0F degress and 90.0% humidity (by 1508060330) Avg/Max/Min:temperature = 80.0/82.0/78.0/ (by 1508060330) Forecast (by 1508060330):more of the same 0):watch out for cooler,rainy weather Currents conditions:78.0F degress and 90.0% humidity (by 1508060330) Avg/Max/Min:temperature = 80.0/82.0/78.0/ (by 1508060330) Forecast (by 1508060330):more of the same