What is a super constructor in Java?

What is a super constructor in Java?

A super constructor in Java is a constructor that is called from a subclass to invoke the constructor of its superclass.

Can you give me an example of how to use a super constructor?

Sure! In a subclass, you can use the super() keyword to call the superclass constructor. For example:

class Parent {
    Parent() {
        System.out.println("Parent constructor called");
    }
}

class Child extends Parent {
    Child() {
        super(); // Calls Parent constructor
        System.out.println("Child constructor called");
    }
}

This will output:

Parent constructor called
Child constructor called

What happens if I don't call the super constructor?

If you don't explicitly call the super constructor, Java automatically calls the no-argument constructor of the superclass. If the superclass doesn't have a no-argument constructor, it will result in a compilation error.

Are there any restrictions on using super constructors?

Yes, you must call the super constructor as the first statement in the subclass constructor. You cannot call it after other statements.