Check out example codes for "super keyword in java". It will help you in understanding the concepts better.

Code Example 1

super keyword is the reference variable which is used to refer immediate 
parent class object.
Let’s see an example on super keyword.

class Manager
   int salary = 50000;
class Employee extends Manager
   int salary = 20000;
   void display(int salary)
      // here refers to the parent class instance variable
   public static void main(String[] args)
      Employee obj = new Employee();

Code Example 2

ObjMaker = function() {this.a = 'first';};
// ObjMaker is just a function, there's nothing special about it that makes 
// it a constructor.

ObjMaker.prototype.b = 'second';
// like all functions, ObjMaker has an accessible prototype property that 
// we can alter. I just added a property called 'b' to it. Like 
// all objects, ObjMaker also has an inaccessible [[prototype]] property
// that we can't do anything with

obj1 = new ObjMaker();
// 3 things just happened.
// A new, empty object was created called obj1.  At first obj1 was the same
// as {}. The [[prototype]] property of obj1 was then set to the current
// object value of the ObjMaker.prototype (if ObjMaker.prototype is later
// assigned a new object value, obj1's [[prototype]] will not change, but you
// can alter the properties of ObjMaker.prototype to add to both the
// prototype and [[prototype]]). The ObjMaker function was executed, with
// obj1 in place of this... so obj1.a was set to 'first'.

// returns 'first'
// obj1 doesn't have a property called 'b', so JavaScript checks 
// its [[prototype]]. Its [[prototype]] is the same as ObjMaker.prototype
// ObjMaker.prototype has a property called 'b' with value 'second'
// returns 'second'

Code Example 3

**Important Points** 

1.It creates a new object. The type of this object is object.
2.It sets this new object's internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property).
3.It makes the this variable point to the newly created object.
4.It executes the constructor function, using the newly created object whenever this is mentioned.
5.It returns the newly created object, unless the constructor function returns a non-null object reference. In this case, that object reference is returned instead.
Note: constructor function refers to the function after the new keyword, as in

new ConstructorFunction(arg1, arg2)

Code Example 4

/* Base class Person */
class Person 
    void message() 
        System.out.println("This is person class"); 
/* Subclass Student */
class Student extends Person 
    void message() 
        System.out.println("This is student class"); 
    // Note that display() is only in Student class 
    void display() 
        // will invoke or call current class message() method 
        // will invoke or call parent class message() method 
/* Driver program to test */
class Test 
    public static void main(String args[]) 
        Student s = new Student(); 
        // calling display() of Student 

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