深入浅出设计模式

				package headfirst.command.party;								public class Light {					String location;					int level;									public Light(String location) {						this.location = location;					}									public void on() {						level = 100;						System.out.println("Light is on");					}									public void off() {						level = 0;						System.out.println("Light is off");					}									public void dim(int level) {						this.level = level;						if (level == 0) {							off();						}						else {							System.out.println("Light is dimmed to " + level + "%");						}					}									public int getLevel() {						return level;					}				}