what is static,super,final keywords in java with example.

1.Static Keyword:-

• In java we can set static as variables,methods,blocks.
• If you declare any variable as static, it is known static variable.
• The static keyword in java is used mainly for memory management.
• The static variable can be used to refer the common property of all objects .  

we can discuss static keyword by example:-

class Employee

{

     int empid;

    String empname;

    static String company="HCL";

         Employee(int id,String n)

         {

             empid=id;

             empname=n; 

          }

         void display()

        {

              System.out.println("empid+""+empname""+company);

         }

public static void main(String arg[])

{

      Employee e1=new Employee(101,"Alex");

      Employee e2=new Employee(102,"Mark");

      

     e1.display();

     e2.display();

}

}

Output:- 101   Alex    HCL

              102  Mark   HCL

2.Super Keyword:-

• The super keyword is also be used to invoke parent class method.
• It should be used if subclass contains the same method as parent class.
• In other word it is used if method is overridden.

we can discuss static keyword by example:-

class Animal

{

     void eat()

     {

          System.out.println("Eating.....");

      }

class Dog extends Animal

{

      void eat()

      {

          System.out.println("Eating Bread");

       }

    void bark()

    {

       System.out.println("Barking");

     }

super.eat();             //use of super keyword

}

}

class TestSuper

{

     public static void main(String arg[])

     {

          Dog d1=new Dog();

          d1.bark();

      }

}

Output:-    Eating.....

3.Final Keyword:-

• Final keyword can be applied to the variable,method,classes

1.Final Variable:-

• The value of variable can be prevented from being modified by declaring a variable as final.
• Example:- int Max=100;

2.Final Method:- 

• A method can be prevented from being overridden by the subclass by declaring the method as final.
• Example:-

                     final void show()     // can't overridden

3.Final Classes:-

• A class which can not be further inherited or can not have any subclass is known as final classes.
• To make a class final,the class declaration is preceded by the final keyword.
• If class declared as final,all of its methods are automatically declared as final.
• Example:-

       final class A

      {

               System.out.println("Web Coders");

      } 

      class B extends A           //ERROR

     {

         System.out.println("Can not inherited");

      }