Java Programming/Keywords/super

super is a keyword.

It is used inside a sub-class method definition to call a method defined in the super class. Private methods of the super-class cannot be called. Only public and protected methods can be called by the super keyword.
It is also used by class constructors to invoke constructors of its parent class.
Super keyword are not used in static Method.

Syntax:

super.<method-name>([zero or more arguments]);

or:

super([zero or more arguments]);

For example:

Code listing 1: SuperClass.javapublic class SuperClass {
   public void printHello() {
      System.out.println("Hello from SuperClass");
      return;
   }
}

Code listing 2: SubClass.javapublic class SubClass extends SuperClass {
   public void printHello() {
      super.printHello();
      System.out.println("Hello from SubClass");
      return;
   }
   public static main(String[] args) {
      SubClass obj = new SubClass();
      obj.printHello();
   }
}

Running the above program:

Command for Code listing 2

$Java SubClass

Output of Code listing 2

Hello from SuperClass
Hello from SubClass

In Java 1.5 and later, the "super" keyword is also used to specify a lower bound on a wildcard type parameter in Generics.

Code section 1: A lower bound on a wildcard type parameter.

public void sort(Comparator<? super T> comp) {
  ...
}