Static Blocks or Static Constructors

As the name suggests static blocks are used to initialise the static fields of the class.

·         These blocks or methods get executed only once for a class.

·         They are executed even before the constructors are executed.

·         The static fields with initializes in declaration will get executed before the  static blocks.

·         They are triggered when any of the following events occur:

o   An instance of the class is created.

o   If any of the static members of the class is accessed.

 The implementation of this is slightly different in Java and C#.

In Java

All blocks that are declared static are executed when a class is loaded. Static blocks in Java do not have a function name.

public class StaticBlockExample {

public static final int abc = 20;

public static final int def;

//Static block to initialise the static variable def

static {

          if(abc == 20)

def = 10;

else

def = 15;

}
//Constructor gets executed after static block is executed

public StaticBlockExample (){}

}

In C#

Static blocks are called as Static Constructors in C#. They are declared using static constructor declarations.

public class StaticBlockExample

{

static int abc = 20;

static int def;

  static StaticBlockExample ()

  {

if(abc == 20)

def = 10;

else

def = 15;

   }

}