Static Keyword
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.
Final Keyword
Java final
keyword is a non-access specifier that is used to restrict a class, variable,
and method. If we initialize a variable with the final keyword, then we cannot
modify its value.
Difference between Static and Final
Static
Final
Static
keyword can be applied to a Final keyword can
be applied
Nested
class, method and block to method
variable and
As well as
variable.
classes.
Static
variable can be change after Final variable
can't be change
Initialization.
after initialization.
Static
method and variable can Object can
created to call final
Be accessed
directly by class name method or final variable.
And does
not Object belong to the
Class.
Access Modifiers
Access
modifiers are keywords that can be used to control the visibility of fields,
methods, and constructors in a class.
1. Private: The access level of a private modifier is only
within the class. It cannot be accessed from outside the class.
2. Default: The access level of a default modifier is only
within the package. It cannot be accessed from outside the package. If you do
not specify any access level, it will be the default.
3. Protected: The access level of a protected modifier is
within the package and outside the package through child class. If you do not
make the child class, it cannot be accessed from outside the package.
4. Public: The access
level of a public modifier is everywhere. It can be accessed from within the class,
outside the class, within the package and outside the package.
Difference between this and super keyword
|
this |
super |
|
In Java, this keyword is a reference variable
that refers to the current object or instance of a class. |
In Java, super keyword is a reference variable
that refers to the superclass's object or instance of a class. |
|
It can access variables and methods of the
current class. |
It can access variables and methods of the parent
class or superclass. |
|
Default constructor of the current class can be
invoked by this. |
Default constructor of the parent class can be
invoked by super. |
|
this() can be passed in the method call as an
argument. |
super() is returned with no arguments. |
|
this() can be passed in the method call as an
argument. |
|
