静态问题 [英] static question

问题描述

大家好

我知道，当一个对象是静态对象时，在任何给定时间只能存在一个对象.我也知道，如果一个类是静态的，我不需要实例化它就可以使用它，这是非常有用的:)

我不明白的是为什么在可实例化的类中包含静态变量有用吗?

示例:

Hey guys

I know that when an object is static only one of that object can exist at any given time. I also know that if a class is static I don''t need to instantiate it to use it which is very useful :)

What i don''t get is why is it useful to have a static variable inside of an instantiate-able class?

Example:

public class Foo
{
    public Foo(int Bar)
    {
        bar = Bar;
    }

    private static int bar;
    public static int Bar
    {
        get { return bar; }
        set { bar = value; }
    }
}

通常，如果您希望同一类型的多个对象共享数据，则请使用

Thanks

推荐答案

.例如，您可能有一个静态RootNode成员，如果您所有的对象都需要引用它-这样，您只需要为整个类初始化一次即可，而不是针对每个实例

Generally, if you want multiple objects of the same type to share data. For example, you might have a static RootNode member, if all your objects need to refer to it - that way you only need to initialise it once for the whole class, rather than per-instance

必须由该类的所有实例共享的所有信息(或不共享任何信息)都是不错的选择.
例如，如果您要计算该类创建了多少个实例(请原谅，双关语).
:)

Every info that has to be shared by all the instances (or none of them) of the class could be a good candidate.
For instance if you want to count how many instances (pardon the pun) of the class were created.
:)

另一个示例是Message类，其中每个实例都有一个唯一的ID，该ID是先前分配的ID + 1；

Another example is a Message class in which each instance has a unique ID that is the previously assigned ID + 1;

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