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Oppiskele Haaste: Oliot | Johdatus Olio-Ohjelmointiin (OOP)
C# Perusteiden Jälkeen

bookHaaste: Oliot

Seuraava ohjelma sisältää kaksi luokkaa, nimittäin Person ja Address.

Lue koodi ja täytä puuttuvat kohdat asianmukaisesti. Tässä tehtävässä sinun tulee selvittää, kuinka pääset käsiksi osoite-olion Country-kenttään, joka sijaitsee address-olion p1-kentässä.

index.cs

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 {___}."); } }

Jos olion kenttä tallentaa toisen olion, voimme käyttää piste (.) -notaatiota päästäksemme syvemmälle kyseiseen olioon. Esimerkiksi objectName.someField.anotherField.

index.cs

index.cs

copy
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}."); } }
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Osio 3. Luku 6

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How do I access the Country field of the address object in p1?

Can you give an example of how to use dot notation for nested objects?

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bookHaaste: Oliot

Pyyhkäise näyttääksesi valikon

Seuraava ohjelma sisältää kaksi luokkaa, nimittäin Person ja Address.

Lue koodi ja täytä puuttuvat kohdat asianmukaisesti. Tässä tehtävässä sinun tulee selvittää, kuinka pääset käsiksi osoite-olion Country-kenttään, joka sijaitsee address-olion p1-kentässä.

index.cs

index.cs

copy
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 {___}."); } }

Jos olion kenttä tallentaa toisen olion, voimme käyttää piste (.) -notaatiota päästäksemme syvemmälle kyseiseen olioon. Esimerkiksi objectName.someField.anotherField.

index.cs

index.cs

copy
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}."); } }
Oliko kaikki selvää?

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Kiitos palautteestasi!

Osio 3. Luku 6
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