java - Java 中引用属性的问题

Question

我一直在试图弄清楚如何将这些属性从数据类正确传递到可执行类，但我不确定如何。这是数据类:

public class Motor {
        private int cylinders;
        private int hp;
        private String type;
        public Motor(int cylinders, int hp, String type) {
            this.cylinders = cylinders;
            this.hp = hp;
            this.type = type;
        }
        public int getCylinders() {
            return cylinders;
        }
        public int getHp() {
            return hp;
        }
        public String getType() {
            return type;
        }
        public String toString() {
            return "Motor: cylinders=" + this.cylinders + ", hp=" + 
                    this.hp + ", type=" + this.type;
        }
}

现在，在另一个数据类中，我应该引用 Motor 并创建一堆其他属性。我对此没有任何(明显的)错误，但我认为如果我不发布它，这些都没有任何意义:

public class Vehicle {
        private String make;
        private String model;
        private int year;
        private double price;
        private Motor motor;
        public Vehicle(String make, String model, int year, double price, Motor motor) {
            this.make = make;
            this.model = model;
            this.year = year;
            this.price = price;
            this.motor = motor;

        }
    public double getPrice() {
            return price;
        }
        public void setPrice(double price) {
            this.price = price;
        }
        public String toString() {
            return "Vehicle make=" + this.make + ", model=" +
                    this.model + ", year=" + this.year + 
                    ", price=" + this.price + ", motor=" +
                    this.motor;
        }
    }

真正的问题是，当我在 TestVehicle 中创建 Vehicle 对象时，当我尝试在 Motor 中添加汽缸、马力和类型的值时，出现错误:

public class TestVehicle {

    public static void main(String[] args) {
        Vehicle v1 = new Vehicle("Toyota", "Corolla", 2015, 15999.0, 7, 300, "Gas");
        System.out.println(v1.toString());

    }

}

当我尝试执行它时出现的错误是:线程“main”java.lang.Error中出现异常: Unresolved 编译问题: 构造函数 Vehicle(String, String, int, double, int, int, String) 未定义

非常感谢!

Answer 1

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The constructor Vehicle(String, String, int, double, int, int, String) is undefined

 Vehicle v1 = new Vehicle("Toyota", "Corolla", 2015, 15999.0, 7, 300, "Gas");

更改为

Motor motor = new Motor( 7, 300, "Gas");
Vehicle v1 = new Vehicle("Toyota", "Corolla", 2015, 15999.0, motor);

检查构造函数。