---
title: "Overriding"
content_type: tutorial
url: "https://learn.unity.com/tutorial/overriding?language=en"
language: en
difficulty: intermediate
duration_minutes: 5
unity_version:
  - "2019.3"
  - "2019.2"
  - "2019.1"
  - "2018.4"
  - "2018.3"
  - "2018.2"
  - "2018.1"
  - "2017.4"
  - "2017.3"
  - "2017.2"
  - "2017.1"
  - "5.x"
  - "4.x"
supported_unity_versions:
  - name: "2019.3"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2019.3"
  - name: "2019.2"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2019.2"
  - name: "2019.1"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2019.1"
  - name: "2018.4"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2018.4"
  - name: "2018.3"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2018.3"
  - name: "2018.2"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2018.2"
  - name: "2018.1"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2018.1"
  - name: "2017.4"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2017.4"
  - name: "2017.3"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2017.3"
  - name: "2017.2"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2017.2"
  - name: "2017.1"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=2017.1"
  - name: "5.x"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=5.x"
  - name: "4.x"
    url: "https://learn.unity.com/tutorial/overriding.md?language=en&version=4.x"
last_updated: "2026-08-04T14:23:47.000Z"
---

# Overriding

Practice overriding members of a base C# class with members of a derived class.

How to override a base class's members with the members of a child class.

## Overriding

[Video](https://connect-mediagw.unity.com/h1/20220110/videos/de31ed6f-d121-47a4-abb5-95904f37dd9f_U_Intermediate_9_Overriding.mp4) ([Transcript (en)](https://connect-mediagw.unity.com/h1/20220111/40ee7500-6fae-4b93-a19d-7313cf071887_I_09_Overriding_V2.0.vtt))

**Fruit Class**

```csharp
using UnityEngine;
using System.Collections;

public class Fruit 
{
    public Fruit ()
    {
        Debug.Log("1st Fruit Constructor Called");
    }

    //These methods are virtual and thus can be overriden
    //in child classes
    public virtual void Chop ()
    {
        Debug.Log("The fruit has been chopped.");        
    }

    public virtual void SayHello ()
    {
        Debug.Log("Hello, I am a fruit.");
    }
}
```

**Apple Class**

```csharp
using UnityEngine;
using System.Collections;

public class Apple : Fruit 
{
    public Apple ()
    {
        Debug.Log("1st Apple Constructor Called");
    }

    //These methods are overrides and therefore
    //can override any virtual methods in the parent
    //class.
    public override void Chop ()
    {
        base.Chop();
        Debug.Log("The apple has been chopped.");        
    }

    public override void SayHello ()
    {
        base.SayHello();
        Debug.Log("Hello, I am an apple.");
    }
}
```

**FruitSalad Class**

```csharp
using UnityEngine;
using System.Collections;

public class FruitSalad : MonoBehaviour 
{    
    void Start () 
    {
        Apple myApple = new Apple();

        //Notice that the Apple version of the methods
        //override the fruit versions. Also notice that
        //since the Apple versions call the Fruit version with
        //the "base" keyword, both are called.
        myApple.SayHello();
        myApple.Chop();    

        //Overriding is also useful in a polymorphic situation.
        //Since the methods of the Fruit class are "virtual" and
        //the methods of the Apple class are "override", when we 
        //upcast an Apple into a Fruit, the Apple version of the 
        //Methods are used.
        Fruit myFruit = new Apple();
        myFruit.SayHello();
        myFruit.Chop();
    }
}
```