为什么Java中的主程序被放入类中？ [英] Why the main program in Java is put into a class?
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问题描述
为什么main方法必须放在类中？我理解OOP的主要想法，但我不能得到为什么主程序在类中定义。这样的类会在某处实例化吗？我的意思是没有类外面的代码。
Why does the main method have to be put into a class? I understand the main ideas of OOP but I cannot get why the main program is defined within a class. Will such a class instantiated somewhere? I mean there is no code outside the class. What is a reason to define a class and never use objects of this class?
推荐答案
Java虚拟机
The Java Virtual Machine (JVM) has to start the application somewhere. As Java does not have a concept of "things outside of a class" the method that is called by the JVM has to be in a class. And because it is static, no instance of that class is created yet.
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