Java static code block [duplicate]

Question

Recently in a lot of programs I've been looking at, I've noticed

static {
    //some code here
}

I'm just looking for some information about this particularly, I'm used to blocks of code all being in methods, or simply classes, does this simply set all code within the block with a static modifier, or is there something more to it?

I guess you can consider it to be like a constructor, but for the class, not any instances of the class. Although I assume you can have multiple static blocks, but of course only one constructor per class. — Alexander Mills
– Alexander Mills, Commented Jun 23, 2015 at 8:34

Community · Accepted Answer · 2017-05-23 11:54:10Z

15

This might be a duplicate question from Static Initialization Blocks

The static block only gets called once, no matter how many objects of that type you create.

edited May 23, 2017 at 11:54

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answered Nov 10, 2012 at 5:42

Ahmad

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4 Comments

AlexVPerl Over a year ago

Does JVM guarantee that the static block will be executed only once per application domain ?

Gijs Overvliet Over a year ago

The static block gets called each time the class is loaded. If there are multiple classloaders that load the class, the code gets executed multiple times.

Alexander Mills Over a year ago

if the program starts multiple times, the static block gets called multiple times also

LearningToCode Over a year ago

Is it a possibility that the class never gets loaded and hence the method never gets called?

Juvanis · Accepted Answer · 2012-11-10 05:41:00Z

4

The code inside a static block is executed first (e.g. before your constructor) once the JVM loads your class.

answered Nov 10, 2012 at 5:41

Juvanis

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2 Comments

Dan Over a year ago

Would this code be inaccessible from external classes?

Jason Sperske Over a year ago

Here is the official explanation from Oracle docs.oracle.com/javase/tutorial/java/javaOO/initial.html

Ofir Farchy · Accepted Answer · 2012-11-10 05:43:41Z

1

Static blocks get called once (at a class level) and does not belong to a specific instance.

you can find more info (with good examples) here, or in the official oracle documentation.

answered Nov 10, 2012 at 5:43

Ofir Farchy

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