Java中引用属性的问题

我一直在试图找出如何将这些属性从数据类正确地传递到可执行类，但我不确定如何传递。以下是数据类：

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并生成一系列其他属性。我没有任何（明显的）错误，但我认为如果我不发布它，所有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;
        }
    }

这就是真正的问题所在，当我在TestVehicle中创建一个Vehicle对象时，我在尝试添加cylinder、hp和type from back in Motor的值时出错：

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，我得到的错误是： 线程“main”java.lang中出现异常。错误：未解决的编译问题： 构造函数载体（String，String，int，double，int，int，String）未定义

非常感谢

线程“main”java.lang中出现异常。错误：未解析编译 问题：构造工具（字符串，字符串，int，double，int， int，String）未定义

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

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
        this.(make, model, year, price, new Motor(cylinders, hp, type))
    }

线程“main”java.lang中出现异常。错误：未解析编译 问题：构造工具（字符串，字符串，int，double，int， int，String）未定义

改为

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

---

检查构造器。

车辆参数传递构造器有问题。请尝试下面的代码，它工作正常

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;
        }
}


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;
        }
    }

class TestVehicle {

    public static void main(String[] args) {
        Motor m1 = new Motor(7,300,"Gas");
        Vehicle v1 = new Vehicle("Toyota", "Corolla", 2015, 15999.0,m1);
        System.out.println(v1.toString());

    }

}

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
        this.(make, model, year, price, new Motor(cylinders, hp, type))
    }

---

车辆参数传递中存在一些问题。请尝试下面的代码，它工作正常

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;
        }
}


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;
        }
    }

class TestVehicle {

    public static void main(String[] args) {
        Motor m1 = new Motor(7,300,"Gas");
        Vehicle v1 = new Vehicle("Toyota", "Corolla", 2015, 15999.0,m1);
        System.out.println(v1.toString());

    }

}

---

这是您的构造函数，您需要字符串、字符串、int、double和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;

    }

您的电机具有如下构造：

public Motor(int cylinders, int hp, String type) {
            this.cylinders = cylinders;
            this.hp = hp;
            this.type = type;
        }

因此，如果您想将电机参数直接作为int，int和String传递给车辆构造函数，您需要一个接受String，String，int，double，int，int，String的车辆构造函数

 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;

    }

您可以向车辆类别添加第二个constructor，如：

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
    this.make = make;
    this.model = model;
    this.year = year;
    this.price = price;
    this.motor = new Motor(cylinders, hp, type);
}

但这不是一个好的样式，如果某些内容发生了更改，您可能会忘记更改两个构造函数。最好是链接构造函数

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
        this.(make, model, year, price, new Motor(cylinders, hp, type))
    }

---

这是您的构造函数，您需要字符串、字符串、int、double和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;

    }

您的电机具有如下构造：

public Motor(int cylinders, int hp, String type) {
            this.cylinders = cylinders;
            this.hp = hp;
            this.type = type;
        }

因此，如果您想将电机参数直接作为int，int和String传递给车辆构造函数，您需要一个接受String，String，int，double，int，int，String的车辆构造函数

 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;

    }

您可以向车辆类别添加第二个constructor，如：

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
    this.make = make;
    this.model = model;
    this.year = year;
    this.price = price;
    this.motor = new Motor(cylinders, hp, type);
}

但这不是一个好的样式，如果某些内容发生了更改，您可能会忘记更改两个构造函数。最好是链接构造函数

public Vehicle(String make, String model, int year, double price, int cylinders, int hp, String type) {
        this.(make, model, year, price, new Motor(cylinders, hp, type))
    }