何时使用泛型？ [英] When to use generics?

问题描述

假设我有：

  public class Honda implements ICar（）{
} 
 
 public class Opel implements ICar（）{
} 
  
 
  
公共班人员{
 ICar car; 
。 
。 
 public Person（ICar c）{
 car = c; 
 
 
 code 
 
 
 
 
 
  public class Person< T extends ICar> {
 T car; 
。 
。 
 public Person（T c）{
 car = c; 
 
 
 
 
 $ b $ p 
 
 $ p $或$是否取决于执行的任务？编辑：所以泛型只适用于聚合关系（容器等）？
 
 
 
编辑：这可能有所帮助：
 p> 
 
 
  Java泛型？ 
 
 
 
我想我问的是泛型只是用于集合？ 
 
解决方案
人通常没有使用某种类型的汽车参数化。只有非常讨厌的人被他们的汽车所定义。人们也会改变车辆（及时）。所以我不会参数化类，如果只是为了语义。
 
 
 
在进入这样的编程细节之前，想想你想从现实世界中模拟出什么。
 p> 
Getting into a little bit of confusion here when to use generics:

Say I have:
public class Honda implements ICar(){
}

public class Opel implements ICar(){
}
should I use:
public class Person{
    ICar car;
    .
    .
    public Person (ICar c){
        car = c;
    }
}
or
public class Person<T extends ICar>{
    T car;
    .
    .
    public Person(T c){
        car = c;
    }
}
or does it depend on the tasks performed?

EDIT: So is generics only for aggregation relationships (containers etc)?

EDIT: This may help:

Java Generics?

I think I am asking is generics just for use with collections?
解决方案
A person is generally not parameterized with a type of car. Only very annoying persons are defined by their car. Persons change cars too (in time). So I would not parameterize the class, if only for the semantics.

Think about what you try to mimic from the real world, before going into such programming details.

                        
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