java what is static

                                    // example on static block in java.
public class StaticBlockExample
{
   // static variable
   static int a = 10;
   static int b;
   // static block
   static
   {
      System.out.println("Static block called.");
      b = a * 5;
   }
   public static void main(String[] args)
   {
      System.out.println("In main method");
      System.out.println("Value of a : " + a);
      System.out.println("Value of b : " + b);
   }
}

                                    Static keyword is used a lot in java. 
 Static means, you
can access those static variables
without creating an object,
just by using a class name.
This means that only one instance of
that static member is created which
is shared across all instances of the class.
Basically we use static keyword when
all members share same instance.

                                    In the Java programming language, the keyword static indicates that the particular member belongs to a type itself,
rather than to an instance of that type.
This means that only one instance of that static member is created which is shared across all instances of the class.

                                    The static keyword in Java is used for memory management mainly. We can apply static keyword with
variables, methods, blocks and nested classes. The static keyword belongs to the class 
  than an instance of the class.

The static can be:

Variable (also known as a class variable)
Method (also known as a class method)
Block
Nested class

                                    static keyword is a non-access modifier. static keyword can be used with 
class level variable, block, method and inner class or nested class.