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Explain about " Static " keyword in Java?

Static Variables
  •  It is a variable which belongs to the class and not to object(instance)
  • Static variables are initialized only once , at the start of the execution . These variables will be initialized first, before the initialization of any instance variables.
  • A single copy to be shared by all instances of the class.
  • A static variable can be accessed directly by the class name and doesn’t need any object Syntax : <class-name>.<variable-name>
Static Methods
  • It is a method which belongs to the class and not to the object(instance).
  • A static method can access only static data. It cannot access non-static data (instance variables).
  • A static method can  call only  other static methods and cannot call a non-static method from it.
  •  A static method  can be accessed directly by the class name and doesn’t need any object. Syntax : <class-name>.<method-name>
  • A static method cannot refer to "this" or "super"  keywords in anyway.
Static Block
  • The static block, is a block of statement inside a Java class that will be executed when a class is first loaded in to the JVM
class Test{
                  static {   
                    //Code goes here
     }
   }

A static block helps to initialize the static data members, just like constructors help to initialize instance members

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