lightoffcommand.java

来自「深入浅出设计模式」· Java 代码 · 共 18 行

package headfirst.command.undo;

public class LightOffCommand implements Command {
	Light light;
 
	public LightOffCommand(Light light) {
		this.light = light;
	}
 
	public void execute() {
		light.off();
	}
 
	public void undo() {
		light.on();
	}
}