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Вивчайте Class Objects | Introduction to Object-Oriented Programming (OOP)
C# Beyond Basics

bookClass Objects

An object of a class can be created using the following syntax:

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className variableName = new className();

We can access the field of a class using the dot (.) operator:

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variableName.fieldName

For-example:

index.cs

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using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player p1= new Player(); p1.username = "Don"; Console.WriteLine(p1.username); } }

The expression new Player(); is used for creating a new object while Player p1 is used for creating a variable for storing that new object. So simply writing Player p1; will only create an empty variable with no object inside it therefore we have to create a new object and, in turn, store it into a variable: Player p1 = new Player();.

Therefore, if we create an Array of size 10 using the Player class, it won't create 10 objects, rather, it will create an empty array with a capacity to store 10 Player objects. This can be understood by the following example:

index.cs

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using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player[] players = new Player[10]; players[0].username = "Don"; // Error on this line Console.WriteLine(players[0].username); } }

The error says "Object reference not set to an instance of an object" which simply means that we are trying to access data from an object that is not there - there is no object to access at the index 0.

This can be fixed by manually creating an object at the index 0:

index.cs

index.cs

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using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player[] players = new Player[10]; players[0] = new Player(); players[0].username = "Don"; Console.WriteLine(players[0].username); } }
question mark

What is the correct syntax for creating a new object from a class called Car?

Select the correct answer

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Секція 3. Розділ 4

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bookClass Objects

Свайпніть щоб показати меню

An object of a class can be created using the following syntax:

index.cs

index.cs

copy
1
className variableName = new className();

We can access the field of a class using the dot (.) operator:

index.cs

index.cs

copy
1
variableName.fieldName

For-example:

index.cs

index.cs

copy
12345678910111213141516
using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player p1= new Player(); p1.username = "Don"; Console.WriteLine(p1.username); } }

The expression new Player(); is used for creating a new object while Player p1 is used for creating a variable for storing that new object. So simply writing Player p1; will only create an empty variable with no object inside it therefore we have to create a new object and, in turn, store it into a variable: Player p1 = new Player();.

Therefore, if we create an Array of size 10 using the Player class, it won't create 10 objects, rather, it will create an empty array with a capacity to store 10 Player objects. This can be understood by the following example:

index.cs

index.cs

copy
12345678910111213141516
using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player[] players = new Player[10]; players[0].username = "Don"; // Error on this line Console.WriteLine(players[0].username); } }

The error says "Object reference not set to an instance of an object" which simply means that we are trying to access data from an object that is not there - there is no object to access at the index 0.

This can be fixed by manually creating an object at the index 0:

index.cs

index.cs

copy
12345678910111213141516
using System; class Player { public string username; } public class ConsoleApp { public static void Main(string[] args) { Player[] players = new Player[10]; players[0] = new Player(); players[0].username = "Don"; Console.WriteLine(players[0].username); } }
question mark

What is the correct syntax for creating a new object from a class called Car?

Select the correct answer

Все було зрозуміло?

Як ми можемо покращити це?

Дякуємо за ваш відгук!

Секція 3. Розділ 4
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