工厂方法(Factory Method)

/**
 * 定义一个交通工具
 */
public interface Vehicle {
    void go();
}
/**
 * 飞行扫把
 */
public class Broom implements Vehicle {
    @Override
    public void go() {
        System.out.println("broom go");
    }
}
/**
 * 汽车
 */
public class Car implements Vehicle {
    @Override
    public void go() {
        System.out.println("car go");
    }
}
/**
 * 飞机
 */
public class Plane implements Vehicle {
    @Override
    public void go() {
        System.out.println("plane go ");
    }
}

/**
 * 交通创建工厂
 */
public interface VehicleFactory {
    Vehicle create();
}
public class BroomFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        System.out.println(" create broom before");
        return new Broom();
    }
}
public class CarFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        System.out.println(" create car before");
        return new Car();
    }
}
public class PlaneFactory implements VehicleFactory {
    @Override
    public Vehicle create() {
        System.out.println(" create plane before");
        return new Plane();
    }
}