Leer Uitdaging: Objecten | Introductie tot Objectgeoriënteerd Programmeren (OOP)

Het volgende programma bevat twee klassen, namelijk Person en Address.

Lees de code en vul de lege plekken op de juiste manier in. In deze opdracht moet je uitzoeken hoe je toegang krijgt tot het veld Country van het adresobject in het address-veld van het p1-object.

index.cs


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using System;

class Person {
    public string name;
    public int age;
    
    // We can use other classes as datatypes for a field in a class
    public Address address;
    
    // We can use the class itself as a datatype for a field as well
    public Person father;
    public Person mother;
}

class Address {
    public string Country;
    public string City;
}

public class ConsoleApp
{
    public static void Main(string[] args)
    {
        Person p1 = new Person();
        p1.name = "Mihaly";
        p1.age = 21;
        
        Person p2 = new Person();
        p2.name = "Ann";
        p2.age = 52;
        
        Person p3 = new Person();
        p3.name = "Nagy";
        p3.age = 51;
        
        p1.mother = p2;
        p1.father = p3;
        
        Address address = new Address();
        address.Country = "Hungary";
        address.City = "Budapest";
        
        // Assigning the address object to the address field in p1
        p1.address = ___;
        
        // Note the expression 'p1.address.Country'
        // p1.address accesses the stored Address object
        // p1.address.Country accesses the Address object's Country field.
        Console.WriteLine($"{___} is the son of {p2.name} and {p3.name}. He is from {___}.");
    }
}

Als een veld van een object een ander object opslaat, kunnen we verder gebruikmaken van de puntnotatie (.) om dieper in dat object te gaan. Bijvoorbeeld: objectName.someField.anotherField.

index.cs


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using System;

class Person {
    public string name;
    public int age;
    
    // We can use other classes as datatypes for a field in a class
    public Address address;
    
    // We can use the class itself as a datatype for a field as well
    public Person father;
    public Person mother;
}

class Address {
    public string Country;
    public string City;
}

public class ConsoleApp
{
    public static void Main(string[] args)
    {
        Person p1 = new Person();
        p1.name = "Mihaly";
        p1.age = 21;
        
        Person p2 = new Person();
        p2.name = "Ann";
        p2.age = 52;
        
        Person p3 = new Person();
        p3.name = "Nagy";
        p3.age = 51;
        
        p1.mother = p2;
        p1.father = p3;
        
        Address address = new Address();
        address.Country = "Hungary";
        address.City = "Budapest";
        
        p1.address = address;
        
        // Note the expression 'p1.address.Country'
        // p1.address accesses the stored Address object
        // p1.address.Country accesses the Address object's Country field.
        Console.WriteLine($"{p1.name} is the son of {p2.name} and {p3.name}. He is from {p1.address.Country}.");
    }
}

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Het volgende programma bevat twee klassen, namelijk Person en Address.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051
            
using System;

class Person {
    public string name;
    public int age;
    
    // We can use other classes as datatypes for a field in a class
    public Address address;
    
    // We can use the class itself as a datatype for a field as well
    public Person father;
    public Person mother;
}

class Address {
    public string Country;
    public string City;
}

public class ConsoleApp
{
    public static void Main(string[] args)
    {
        Person p1 = new Person();
        p1.name = "Mihaly";
        p1.age = 21;
        
        Person p2 = new Person();
        p2.name = "Ann";
        p2.age = 52;
        
        Person p3 = new Person();
        p3.name = "Nagy";
        p3.age = 51;
        
        p1.mother = p2;
        p1.father = p3;
        
        Address address = new Address();
        address.Country = "Hungary";
        address.City = "Budapest";
        
        // Assigning the address object to the address field in p1
        p1.address = ___;
        
        // Note the expression 'p1.address.Country'
        // p1.address accesses the stored Address object
        // p1.address.Country accesses the Address object's Country field.
        Console.WriteLine($"{___} is the son of {p2.name} and {p3.name}. He is from {___}.");
    }
}

Als een veld van een object een ander object opslaat, kunnen we verder gebruikmaken van de puntnotatie (.) om dieper in dat object te gaan. Bijvoorbeeld: objectName.someField.anotherField.

index.cs


              1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
            
using System;

class Person {
    public string name;
    public int age;
    
    // We can use other classes as datatypes for a field in a class
    public Address address;
    
    // We can use the class itself as a datatype for a field as well
    public Person father;
    public Person mother;
}

class Address {
    public string Country;
    public string City;
}

public class ConsoleApp
{
    public static void Main(string[] args)
    {
        Person p1 = new Person();
        p1.name = "Mihaly";
        p1.age = 21;
        
        Person p2 = new Person();
        p2.name = "Ann";
        p2.age = 52;
        
        Person p3 = new Person();
        p3.name = "Nagy";
        p3.age = 51;
        
        p1.mother = p2;
        p1.father = p3;
        
        Address address = new Address();
        address.Country = "Hungary";
        address.City = "Budapest";
        
        p1.address = address;
        
        // Note the expression 'p1.address.Country'
        // p1.address accesses the stored Address object
        // p1.address.Country accesses the Address object's Country field.
        Console.WriteLine($"{p1.name} is the son of {p2.name} and {p3.name}. He is from {p1.address.Country}.");
    }
}

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 3. Hoofdstuk 6