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javaconstructorstaticstatic-constructor
Bilal Maqsood
Bilal Maqsood

Reputation: 1246

How to gain Static Constructor's functionality in JAVA?

I am learning C# and JAVA I found Static Constructor in C# which is used to initialize any static data, or to perform a particular action that needs to be performed once only. It is called automatically before the first instance is created or any static members are referenced.

For Example:

class SimpleClass
{
    // Static variable that must be initialized at run time. 
    static readonly long baseline;

    // Static constructor is called at most one time, before any 
    // instance constructor is invoked or member is accessed. 
    static SimpleClass()
    {
        baseline = DateTime.Now.Ticks;
    }
}

My Question is that how can I gain same functionality in JAVA is there any way ???

Upvotes: 7

Views: 2096

Answers (2)

Razib
Razib

Reputation: 11163

You may use static initialization block like this - 

class SimpleClass
{
    static{

    }

}

The static block only gets called once, no matter how many objects of that type is being created.

You may see this link for more details.

Update: static initialization block is called only when the class is loaded into the memory.

Upvotes: 9

Eran
Eran

Reputation: 393781

You have static initializer block.

static final long baseline;
static {
    baseline = ...
}

Upvotes: 7

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