Java Keyword -- super

Reference: super

When we override superclass's methods, but still want to invoke them, we can use keyword super in child classes. We can also use super to refer to a hidden field (although hiding fields is discouraged).

// Superclass is parent class
public class Superclass {

    public void printMethod() {
        System.out.println("Printed in Superclass.");
    }
}

// Subclass is child class
public class Subclass extends Superclass {

    // overrides printMethod in Superclass
    public void printMethod() {
        super.printMethod();
        System.out.println("Printed in Subclass");
    }
    public static void main(String[] args) {
        Subclass s = new Subclass();
        s.printMethod();
    }
}

Compiling and executing Subclass prints the following:

Printed in Superclass.
Printed in Subclass

We can also use super() or super(parameter list) to invoke superclass's constructor.