如何强制类初始化？ [英] How to force a class to be initialised?

问题描述

这是最好的和最干净的方法是什么？具体来说，我需要一个静态初始化块中的一些代码来运行在该类中，但我想让它尽可能的清晰。

解决方案

正在加载！=初始化。

您希望初始化类（这是在执行静态块时执行的） >

摘录自 Java语言规范说：

类或接口类型T将在第一个发生以下任一情况：

• T是一个类，创建一个T实例。


• T是一个类，由T声明的静态方法被调用。


• 分配由T声明的静态字段。


• 使用由T声明的静态字段，并且该字段不是常量变量（§4.12.4）。


• T是顶级类和assert语句嵌套在T中。

在类Class和package java.lang.reflect中调用某些反射方法也会导致类或接口初始化。

Doh，anovstrup，已经说过：只需要一个空的静态函数调用 init 。一定要记录这个好...我个人看不到任何用例在良好的代码的上下文中。

What is the best and cleanest way to do this? Specifically, I need some code in a static initializer block to run in that class, but I'd like to make this as clean-looking as possible.

解决方案

Loading != Initialization.

You want your class to be initialized (this is when static blocks executed, among other things).

An excerpt from the Java Language Specification says:

A class or interface type T will be initialized immediately before the first occurrence of >any one of the following:

• T is a class and an instance of T is created.
• T is a class and a static method declared by T is invoked.
• A static field declared by T is assigned.
• A static field declared by T is used and the field is not a constant variable (§4.12.4).
• T is a top-level class, and an assert statement (§14.10) lexically nested within T is executed.

Invocation of certain reflective methods in class Class and in package java.lang.reflect also causes class or interface initialization. A class or interface will not be initialized under any other circumstance.

Doh, anovstrup, already said it: Just make an empty static function called init. Be sure to document that well... I personally can't see any use case for this in the context of well formed code though.

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