静态初始化块和常规静态初始化的区别 [英] Difference between the static initializer block and regular static initialization

问题描述

正如标题所说，两者究竟有什么区别

As the title says, what exactly is the difference between

public static String myString = "Hello World!";

和

public static String myString;

static {
    myString = "Hello World";
}

除了结构之外还有什么重要的区别吗?

is there any important difference other than the structure ?

推荐答案

对于您的示例，没有区别.但正如你所看到的，

For your example, there is no difference. But as you can see,

public static String myString = "Hello World!";

只能接受一个表达式来初始化变量.但是，在 静态初始值设定项 (JLS 8.7)，可以执行任意数量的语句.例如.可以这样做:

can only accept an expression to initialize the variable. However, in a static initializer (JLS 8.7), any number of statements may be executed. E.g. it's possible to do this:

static
{
    myString = "Hello";
    myString += " ";
    myString += "World";
}

对于您的示例，显然没有必要这样做，但是变量的初始化可能需要的不仅仅是一个表达式，也许还有许多语句，因此 Java 制作了静态初始化程序.

For your example, there's obviously no need to do that, but it's possible for the initialization of a variable to take more than an expression, perhaps many statements, so Java made static initializers.

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