Link to the "parent" object

Question

Suppose I have two classes that look like this:

public class Human {
     private String name;
     private String id;
     private List<Bike> bikes;
}

public class Bike {
    private String model;
    private String id;
    private String type;
}

Now, is it worth putting String humanIDinto a classroom bike? I can do almost any operation with the current structure, but if, for example, I get a bike object and want to know its owner, I need to iterate over a collection of people. On the other hand, if I put the humanID inside the bike, I feel that it will be curious redundant information, because the agregation itself says who the owner is. So can someone explain which one is the right approach and why?

Answer 1

It is entirely up to your use.

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Answer 2

-, , ( ):

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: Human, Bike HumanBike, , ​​ , .

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Java?

Human Set Bike, , :

public class Human {
     private String name;
     private String id;
     private Set<Bike> bikes;
}

, Bike Human, :

public class Bike {
    private String model;
    private String id;
    private String type;
    private Human owner;
}

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Answer 3

, , owner , . : class HumanHasBike{ Human human; List<Bike> bikes;}