“无法从静态上下文引用非静态方法”背后的原因是什么？ [英] What is the reason behind "non-static method cannot be referenced from a static context"?

问题描述

非常常见的初学者错误是当你尝试静态地使用类属性而不创建该类的实例时。它会留下您提到的错误消息：

The very common beginner mistake is when you try to use a class property "statically" without making an instance of that class. It leaves you with the mentioned error message:

您可以将非静态方法设为静态，也可以使该类的实例使用它属性。

You can either make the non static method static or make an instance of that class to use its properties.

为什么？我不是要求解决方案。我很高兴知道它背后的原因是什么。核心原因！

private java.util.List<String> someMethod(){
    /* Some Code */
    return someList;            
}

public static void main(String[] strArgs){          
     // The following statement causes the error. You know why..
    java.util.List<String> someList = someMethod();         
}

推荐答案

你不能打电话那不存在。由于尚未创建对象，因此尚不存在非静态方法。静态方法（按定义）始终存在。

You can't call something that doesn't exist. Since you haven't created an object, the non-static method doesn't exist yet. A static method (by definition) always exists.

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