Super Keyword

/*
The super keyword is used in 3 cases:-
    1. To refer instance variable of immediate parent class
    2. To invoke custructor of immediate parent class
    3. To invoke a method of immediate parent class
*/
class SuperClass{
    int a = 1; //instance variable of parent class
    SuperClass(){
        System.out.println("\nControl is in super class Constructor.");
    }
    void SuperClassMethod(){
        System.out.println("\nControl is in super class Method.");
    }
}
class SubClass extends SuperClass{
    int a = 2; //instance variable of subclass
    SubClass(){
        super(); //To call the immediate parent's constructor
        System.out.println("\nControl is in sub class Constructor.");
    }
    void SubClassMethod(){
        System.out.println("\nControl is in sub class Method");
        super.SuperClassMethod(); //To invoke a method of immediate parent class
        System.out.println("\na(super class): "+super.a);//To refer to class variable of immediate paraent class
        System.out.println("\na(sub class): "+a);
    }
}
class SuperTest{
    public static void main(String args[]){
        new SubClass().SubClassMethod();
    }
}