Java 中的静态块 [英] Static Block in Java

问题描述

前几天我正在查看一些代码，我发现:

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

static {
    ...
}

来自 C++，我不知道为什么会出现这种情况.这不是错误，因为代码编译得很好.这个静态"代码块是什么?

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

这是一个 静态初始化器.它在类加载(或初始化，准确地说，但您通常不会注意到差异)时执行.

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".

注意还有实例初始值设定项，除了没有 static 关键字外，它们看起来相同.当创建对象的新实例时，除了构造函数中的代码之外，它们还会运行.

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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