FAQ: Inheritance and Polymorphism - Inheritance in Practice

This community-built FAQ covers the “Inheritance in Practice” exercise from the lesson “Inheritance and Polymorphism”.

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This is regarding the question in the 2nd exercise, where the parent class is ‘Noodle’ and the child class is ‘Spaghetti’.
How were we able to create an object (spaghettiPomodoro) without defining its constructor in the spaghetti class? All we did was define a class. No constructor was defined.
I searched on google and confirmed that we cannot create an object without a constructor. Is it a mistake in the IDE or am I missing something?

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Java provides a default constructor in the case if do not explicitly add one. And yes you are right about object cannot be created without constructor but the java itself defines default constructor without any parameters

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What is the code this.texture means and perform in the second exercise in line 9?

“this.” refers to the class instance in question. You may have several types of spaghetti in your program, but want the texture of a specific instance.

If you’re familiar with Python, this. is analogous to self.

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I’m stuck on step 3. How do I print the String, “texture,” if it’s already stated.

You are asked to create an instance of Spaghetti class in Noodle class’s main method.

Spaghetti yourNewInstance = new Spaghetti();

Each new instance of a class is an object which receives states defined in its class and its class’s parent class (inheritance). All those states become properties of each instance object. You can access them like properties.

<object>.<property>;

So if Spaghetti class inherits all states and methods of its parent class (Noodle), your new instance object should have a property called ‘texture’. You can access it like this…

yourNewInstance.texture;

To print it wrap it in System.out.println().