“不能从静态上下文中引用非静态方法"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您尝试静态地"使用类属性时无需创建该类的实例.它给您留下了提到的错误消息:

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:

您可以使非静态方法成为静态方法，也可以使该类的实例使用其属性.

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

这背后的原因是什么?我不关心解决方案，而关心原因.

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

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

推荐答案

你不能调用不存在的东西.由于您尚未创建对象，因此非静态方法尚不存在.静态方法(根据定义)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.

这篇关于“不能从静态上下文中引用非静态方法"背后的原因是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！