Java中的静态块 [英] Static Block in Java

问题描述

前几天我查看了一些代码而且我遇到了：

I was looking over some code the other day and I came across:

static {
    ...
}

来自C ++，我不知道为什么会这样。它不是一个错误，因为代码编译得很好。什么是静态代码块？

Coming from C++, I had no idea why that was there. Its not an error because the code compiled fine. What is this "static" block of code?

推荐答案

这是静态初始化程序。它是在加载类时执行的（或者是初始化的，确切地说，但是你通常没有注意到它的区别）。

It's a static initializer. It's executed when the class is loaded (or initialized, to be precise, but you usually don't notice the difference).

它可以被认为是一个类构造函数。

It can be thought of as a "class constructor".

请注意，还有实例初始值设定项，看起来相同，只是它们没有 static 关键字。当创建对象的新实例时，除构造函数中的代码外，还会运行。

Note that there are also instance initializers, which look the same, except that they don't have the static keyword. Those are run in addition to the code in the constructor when a new instance of the object is created.

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