Static Keyword

1.       static defines class level and not instance level

2.       used for static variables/ static methods/ static block/ static inner class/ Interface static method(only Java 8 onwards)

Static Variables:

1.       class variable and not object/instance variable

2.       since shared across all instances of Object NOT THREAD SAFE

3.       usually, used with final keyword

4.       if not private, can be accessed with ClassName.variableName
       private static int i;

Static Method:

1.       Can access only static variables of the class and invoke only static methods

2.       Usually utility methods which we want to expose to other class without creating an instance of the class
      private static countA();

Static Block:

1.       Gets executed when the class gets loaded in the memory by Java ClassLoader

2.       Used to initialize static variables of the class

3.       Can’t access non-static variables  in static block

4.       Can have multiple static blocks in a class

Static Class:

1.       It is a nested class

2.       Can’t use nested on the outer class

j

    Java Static Import:

    From Java 1.5 we can import static members methods & variables in another class

    import static com.PackageName.ClassName.variableName;

    import static com.PackageName.ClassName.methodName; -- no need to give ()