目录

• 实验代码
• WeatherState.java
• Weather.java
• WeatherForecast.java
• CloudyLittleState.java
• CloudyDayState.java
• HeavyRainState.java
• LightRainState.java
• 运行结果

实验代码

WeatherState.java

package lab2;

public interface WeatherState {
    public void showState();
}

Weather.java

package lab2;

public class Weather {

    WeatherState state;

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

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

WeatherForecast.java

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 今天夜间:");
        weatherBeijing.setState(new LightRainState());
        weatherBeijing.show();
        System.out.print("转:");
        weatherBeijing.setState(new HeavyRainState());
        weatherBeijing.show();
        System.out.print("\n 明天白天:");
        weatherBeijing.setState(new LightRainState());
        weatherBeijing.show();
        System.out.print("\n 明天夜间:");
        weatherBeijing.setState(new CloudyLittleState());
        weatherBeijing.show();
    }
}

CloudyLittleState.java

package lab2;

public class CloudyLittleState implements WeatherState {

    public void showState() {
        System.out.print("少云,有时晴！");
    }
}

CloudyDayState.java

package lab2;

public class CloudyDayState implements WeatherState{

    @Override
    public void showState() {
        System.out.println("多云，为阴天！");
    }
}

HeavyRainState.java

package lab2;

public class HeavyRainState implements WeatherState {

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

LightRainState.java

package lab2;

public class LightRainState implements WeatherState {

    @Override
    public void showState() {
        System.out.println("小雨，几乎没有雨！");
    }
}

运行结果

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