package per.mjn.pattern.command;import java.util.HashMap;
import java.util.Map;// 订单类
public class Order {// 餐桌号码private int diningTable;// 点的餐品和份数private Map foodDir = new HashMap<>();public int getDiningTable() {return diningTable;}public void setDiningTable(int diningTable) {this.diningTable = diningTable;}public Map getFoodDir() {return foodDir;}public void setFood(String name, int num) {foodDir.put(name, num);}
}

package per.mjn.pattern.command;// 厨师类
public class SeniorChef {public void makeFood(String name, int num) {System.out.println(num + "份" + name);}
}

package per.mjn.pattern.command;// 抽象命令类
public interface Command {void execute();
}

package per.mjn.pattern.command;import java.util.Map;
import java.util.Set;// 具体的命令类
public class OrderCommand implements Command {// 持有接受者对象private SeniorChef receiver;private Order order;public OrderCommand(SeniorChef receiver, Order order) {this.receiver = receiver;this.order = order;}@Overridepublic void execute() {System.out.println(order.getDiningTable() + "桌的订单:");Map foodDir = order.getFoodDir();// 遍历map集合Set keys = foodDir.keySet();for (String foodName : keys) {receiver.makeFood(foodName, foodDir.get(foodName));}System.out.println(order.getDiningTable() + "桌的饭准备完毕!!!");}
}

package per.mjn.pattern.command;import java.util.ArrayList;
import java.util.List;// 服务员类，属于调用者角色
public class Waiter {// 持有多个命令对象private List commands = new ArrayList<>();public void setCommand(Command cmd) {// 将cmd对象存储到list集合中commands.add(cmd);}// 发起命令功能  喊 订单来了public void orderUp() {System.out.println("服务员说：大厨，新订单来了.");// 遍历list集合for (Command command : commands) {if (command != null) {command.execute();}}}
}

package per.mjn.pattern.command;public class Client {public static void main(String[] args) {// 创建第一个订单对象Order order1 = new Order();order1.setDiningTable(1);order1.setFood("鸡翅", 2);order1.setFood("小杯可乐", 2);// 创建第二个订单对象Order order2 = new Order();order2.setDiningTable(2);order2.setFood("鸡排", 2);order2.setFood("小杯雪碧", 2);// 创建接受者对象（厨师对象）SeniorChef receiver = new SeniorChef();// 创建命令对象OrderCommand cmd1 = new OrderCommand(receiver, order1);OrderCommand cmd2 = new OrderCommand(receiver, order2);// 创建调用者（服务员对象）Waiter waiter = new Waiter();waiter.setCommand(cmd1);waiter.setCommand(cmd2);// 让服务员发起命令waiter.orderUp();}
}