super keyword in Java

The super keyword in java is a reference variable that is used to refer parent class objects.  
* Use of super with variables. When a derived class and base class has same data members, to resolve ambiguity we use super keyword. 
* Use of super with methods. Whenever a parent and child class have same named methods, to resolve ambiguity we use super keyword. 
* Use of super with constructors. Super keyword can also be used to access the parent class constructor. 
```
class Person {
    int age = 10;
    Person() {
        System.out.println("Person()");
    }
    void show() { 
        System.out.println("Person::show()");
        System.out.println(age);
    }
}
  
class Student extends Person {
    int age = 20;
    Student() {
        super();
        System.out.println("Student()");
    }
    void show() { 
        super.show();
        System.out.println(super.age);
        System.out.println("Student::show()");
        System.out.println(age);
    }
}
  
class Main {
    public static void main(String[] args) {
        Student s = new Student();
        s.show();
    }
}
```
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