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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