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Язык

Overriding

Проверено с версией:: 4.1

-

Сложность: Средняя

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

Overriding

Средняя Scripting

Fruit Class

Code snippet

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.");
    }
}

#pragma strict

public class Fruit 
{
    public function Fruit ()
    {
        Debug.Log("1st Fruit Constructor Called");
    }
    
    //Overriding members happens automatically in 
    //Javascript and doesn't require additional keywords
    public function Chop ()
    {
        Debug.Log("The fruit has been chopped.");     
    }
    
    public function SayHello ()
    {
        Debug.Log("Hello, I am a fruit.");
    }
}

import UnityEngine
import System.Collections


public class Fruit:

    public def constructor():
        Debug.Log('1st Fruit Constructor Called')

    
    //These methods are virtual and thus can be overriden
    //in child classes
    public virtual def Chop():
        Debug.Log('The fruit has been chopped.')

    
    public virtual def SayHello():
        Debug.Log('Hello, I am a fruit.')

Apple Class

Code snippet

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.");
    }
}

#pragma strict

public class Apple extends Fruit 
{
    public function Apple ()
    {
        Debug.Log("1st Apple Constructor Called");
    }
    
    //Overriding members happens automatically in 
    //Javascript and doesn't require additional keywords
    public function Chop ()
    {
        super.Chop();
        Debug.Log("The apple has been chopped.");     
    }
    
    public function SayHello ()
    {
        super.SayHello();
        Debug.Log("Hello, I am an apple.");
    }
}

import UnityEngine
import System.Collections


public class Apple(Fruit):

    public def constructor():
        Debug.Log('1st Apple Constructor Called')

    
    //These methods are overrides and therefore
    //can override any virtual methods in the parent
    //class.
    public override def Chop():
        super.Chop()
        Debug.Log('The apple has been chopped.')

    
    public override def SayHello():
        super.SayHello()
        Debug.Log('Hello, I am an apple.')

FruitSalad Class

Code snippet

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();
    }
}

#pragma strict

function Start () 
{
    var 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.
    var myFruit = new Apple();
    myFruit.SayHello();
    myFruit.Chop();
}

import UnityEngine
import System.Collections


public class FruitSalad(MonoBehaviour):

    private def Start():
        myApple = 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.
        myFruit as Fruit = Apple()
        myFruit.SayHello()
        myFruit.Chop()

Связанные обучающие материалы

Classes (Урок)
Inheritance (Урок)
Member Hiding (Урок)

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Unity ID

Overriding

Проверено с версией:: 4.1

-

Сложность: Средняя

Overriding

Fruit Class

Code snippet

Apple Class

Code snippet

FruitSalad Class

Code snippet

Связанные обучающие материалы

Scripting

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