题目要求

1. 有一个交通工具接口类Vehicles，有work接口
2. 有Horse类和Boat类分别实现Vehicles
3. 创建交通工具工厂类，有两个方法分别获得交通工具Horse和Boat
4. 有Person类，有name和Vehicles属性，在构造器中为两个属性赋值
5. 实例化Person对象“唐僧”，要求一般情况下用Horse作为交通工具，遇到大河时用Boat作为交通工具

public class Homework06 {public static void main(String[] args) {Person person = new Person("唐僧",new Horse());person.common();person.passRiver();}
}
//1.有一个交通工具接口类Vehicles，有work接口
interface Vehicles{void work();
}
//2.有Horse类和Boat类分别实现Vehicles
class Horse implements Vehicles{@Overridepublic void work() {System.out.println("骑马");}
}
class Boat implements Vehicles{@Overridepublic void work() {System.out.println("坐船");}
}
//3.创建交通工具工厂类，有两个方法分别获得交通工具Horse和Boatclass Fork{private static Horse horse = new Horse();//饿汉式，马始终是一匹//将方法做成静态方法容易调动public static Boat getBoat(){//获取Boatreturn new Boat();}public static Horse getHorse(){//获取Horsereturn horse;}
}
//4.有Person类，有name和Vehicles属性，在构造器中为两个属性赋值class Person{private String name;private Vehicles vehicles;public Person(String name, Vehicles vehicles) {this.name = name;this.vehicles = vehicles;}public void passRiver(){//先得到船//判断，当前的vehicles属性时null，就获取一艘船//如何防止始终使用的时传入的马 interface//vehicles instanceof Boat用来判断当前的vehicles是不是Boat//1.vehicles = null：vehicles interface Boat =》 false;//1.vehicles = 马对象：vehicles interface Boat =》 false;//1.vehicles = 船对象：vehicles interface Boat =》 true;if (!(vehicles instanceof Boat)) {vehicles = Fork.getBoat();}vehicles.work();}public void common(){if (!(vehicles instanceof Horse)) {vehicles = Fork.getHorse();}vehicles.work();}
}