Herausforderung: Objekte
Das folgende Programm enthält zwei Klassen, nämlich Person
und Address
.
Lies den Code und fülle die Lücken entsprechend aus. In dieser Aufgabe musst du herausfinden, wie auf das Feld Country
des Address-Objekts im Feld address
des Objekts p1
zugegriffen werden kann.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051using 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($"{___} is the son of {p2.name} and {p3.name}. He is from {___}."); } }
Wenn ein Feld eines Objekts ein weiteres Objekt speichert, kann die Punktnotation (.
) verwendet werden, um tiefer in dieses Objekt zuzugreifen. Zum Beispiel objectName.someField.anotherField
.
index.cs
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950using System; class Person { public string name; public int age; // We can use other classes as datatypes for a field in a class public Address address; // We can use the class itself as a datatype for a field as well public Person father; public Person mother; } class Address { public string Country; public string City; } public class ConsoleApp { public static void Main(string[] args) { Person p1 = new Person(); p1.name = "Mihaly"; p1.age = 21; Person p2 = new Person(); p2.name = "Ann"; p2.age = 52; Person p3 = new Person(); p3.name = "Nagy"; p3.age = 51; p1.mother = p2; p1.father = p3; Address address = new Address(); address.Country = "Hungary"; address.City = "Budapest"; p1.address = address; // Note the expression 'p1.address.Country' // p1.address accesses the stored Address object // p1.address.Country accesses the Address object's Country field. Console.WriteLine($"{p1.name} is the son of {p2.name} and {p3.name}. He is from {p1.address.Country}."); } }
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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?
Can you explain how object fields work in this context?
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Herausforderung: Objekte
Swipe um das Menü anzuzeigen
Das folgende Programm enthält zwei Klassen, nämlich Person
und Address
.
Lies den Code und fülle die Lücken entsprechend aus. In dieser Aufgabe musst du herausfinden, wie auf das Feld Country
des Address-Objekts im Feld address
des Objekts p1
zugegriffen werden kann.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051using 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($"{___} is the son of {p2.name} and {p3.name}. He is from {___}."); } }
Wenn ein Feld eines Objekts ein weiteres Objekt speichert, kann die Punktnotation (.
) verwendet werden, um tiefer in dieses Objekt zuzugreifen. Zum Beispiel objectName.someField.anotherField
.
index.cs
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950using System; class Person { public string name; public int age; // We can use other classes as datatypes for a field in a class public Address address; // We can use the class itself as a datatype for a field as well public Person father; public Person mother; } class Address { public string Country; public string City; } public class ConsoleApp { public static void Main(string[] args) { Person p1 = new Person(); p1.name = "Mihaly"; p1.age = 21; Person p2 = new Person(); p2.name = "Ann"; p2.age = 52; Person p3 = new Person(); p3.name = "Nagy"; p3.age = 51; p1.mother = p2; p1.father = p3; Address address = new Address(); address.Country = "Hungary"; address.City = "Budapest"; p1.address = address; // Note the expression 'p1.address.Country' // p1.address accesses the stored Address object // p1.address.Country accesses the Address object's Country field. Console.WriteLine($"{p1.name} is the son of {p2.name} and {p3.name}. He is from {p1.address.Country}."); } }
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