How do I use the super keyword in Java?

How do I use the super keyword in Java?

The super keyword in Java is used to refer to the immediate parent class of the current object. It can be used to access parent class methods and constructors.

Can you give me an example of using super in a constructor?

Sure! Here's an example:

class Parent {
    Parent(String name) {
        System.out.println("Parent name: " + name);
    }
}

class Child extends Parent {
    Child(String name) {
        super(name); // Calls the constructor of Parent
        System.out.println("Child created.");
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child("John");
    }
}

In this example, the super(name) call in the Child constructor invokes the Parent constructor.

What if I want to call a method from the parent class?

You can use super to call a method from the parent class like this:

class Parent {
    void display() {
        System.out.println("Display from Parent");
    }
}

class Child extends Parent {
    void display() {
        super.display(); // Calls the display method from Parent
        System.out.println("Display from Child");
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child();
        child.display();
    }
}

This will output both messages from the parent and child classes.

Thanks! Is there anything else I should know about the super keyword?

Yes! Remember that super can only be used in a subclass to access the parent class's members. Also, it must be the first statement in the constructor if used.