---
title: "Nullary constructor"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/Nullary_constructor"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T11:36:45.009411+00:00"
instance: "kb-cron"
---

In computer programming, a nullary constructor is a constructor that takes no arguments. Also known as a 0-argument constructor, no-argument constructor, parameterless constructor or default constructor.


== Object-oriented constructors ==
In object-oriented programming, a constructor is code that is run when an object is created. Default constructors of objects are usually nullary.


=== Java example ===


=== C++ example ===


== Algebraic data types ==
In algebraic data types, a constructor is one of many tags that wrap data. If a constructor does not take any data arguments, it is nullary.


=== Haskell example ===


== See also ==
Default constructor


== References ==