java - 在 OOP 中为类编写复制方法

Question

假设我有一个汽车类别，这是它的代码:

public class Car {
    private String make;
    private String model;
    private int year;

    public Car()
    {
        this.make = "";
        this.model = "";
        this.year = 0;
    }

    public Car(Car c)
    {
        this.make = c.getMake();
        this.model = c.getModel();
        this.year = c.getYear();
    }

    public String getMake() {
        return make;
    }

    public String getModel() {
        return model;
    }

    public int getYear() {
        return year;
    }

    /* Trouble here */
    public Car copy(Car c)
    {
        return c; // But needs all properties to be same as current instance of class.
    }

}

请注意，我的私有(private)字段没有 Setter 方法。有没有一种方法可以让我使用 Copy(Car c) 方法将我的实例复制到相同类型的目标对象中并返回目标对象？

不添加 Setters 方法。

Answer 1

试试这个:

public Car copy(Car c)
{
    c.make = this.make;
    c.model = this.model;
    c.year = this.year;
    return c; // But needs all properties to be same as current instance of class.
}