利用Java實現天氣預報播報功能

package lab2;

public interface WeatherState {
    public void showState();
}

package lab2;

public class Weather {

    WeatherState state;

    public void show() {
        state.showState();
    }

    public void setState(WeatherState s) {
        state = s;
    }
}

package lab2;

public class WeatherForecast {

    public static void main(String args[]) {
        Weather weatherBeijing = new Weather();
        System.out.print("\n 今天白天:");
        weatherBeijing.setState(new CloudyDayState());
        weatherBeijing.show();
        System.out.print("\n 今天夜間:");
        weatherBeijing.setState(new LightRainState());
        weatherBeijing.show();
        System.out.print("轉:");
        weatherBeijing.setState(new HeavyRainState());
        weatherBeijing.show();
        System.out.print("\n 明天白天:");
        weatherBeijing.setState(new LightRainState());
        weatherBeijing.show();
        System.out.print("\n 明天夜間:");
        weatherBeijing.setState(new CloudyLittleState());
        weatherBeijing.show();
    }
}

package lab2;

public class CloudyLittleState implements WeatherState {

    public void showState() {
        System.out.print("少雲,有時晴！");
    }
}

package lab2;

public class CloudyDayState implements WeatherState{

    @Override
    public void showState() {
        System.out.println("多雲，為陰天！");
    }
}

package lab2;

public class HeavyRainState implements WeatherState {

    @Override
    public void showState() {
        System.out.println("有大雨來臨！");
    }
}

package lab2;

public class LightRainState implements WeatherState {

    @Override
    public void showState() {
        System.out.println("小雨，幾乎沒有雨！");
    }
}