无法在静态方法中使用实例变量 [英] Unable to use instance variable in a static method

问题描述

为什么我们不能在static method中使用instance variable? 我知道静态方法是在不创建类实例的情况下调用的，但是什么限制了非静态变量在静态方法中的使用呢?

Why we cannot use instance variable in a static method? I know that static methods are called without creating instance of classes but what restricts the non static variable to be used in static method?

class MyClass
{
    // non-static instance member variable
    private int a;
    //static member variable
    private static int b;

    //static method
    public static void DoSomething()
    {
        //this will result in compilation error as "a" has no memory
        a = a + 1;
        //this works fine since "b" is static
        b = b + 1;
    }
}

推荐答案

尝试将非静态变量放入static方法中会使编译器感到疑惑，我应该真正更新该变量的哪个实例? static方法与类实例无关，因此，当不存在任何实例时，将不可能在实例上调用实例变量.

Trying to put a non-static variable inside a static method makes the compiler wonder which instance of this variable should I really be updating? The static methods are not related to a class instance, so it will be impossible to call an instance variable on an instance when no instance exists.

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