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Overview

  • working with objects
  • adding static memebrs
  • exploring the interface
  • writing unit tests

working with objects

//<Variable type><VariableName> = mew <Class>(arg1, arg2)
Product product = new Product(123, "coffee")

product.UserProduct(); //invoke methods
product.Name = "cafe sua da" // change property
int number = product.UpdateStock(); // return a value from a method

objName = new object

  • objName -> stack
  • object -> heap
  • reference points to object
  • pointers.. nice

New shorthand Syntax:

Product product = new (123);

Constructor Chaining

public class Product
{
  public int Id { get; set;}
  public string Name { get; set; }
  public string Category { get; set; }

  public Product() : this(0, "unkown product", "general"){}
  public Product(int id) : this(id, "uknown proudct", "general")
  public Product(int id, string name) : this(id, name, "general")

  public Product(int id, string name, string category)
  {
    this.Id = id;
    this.Name = name;
    this.Category = category;
  }
}
new Product(1);

Product(1)
└── calls this(1, "unknown product", "general")
Product(1, "unkown product", "general")
└── this.Id = 1
└── this.Name = "unkown product"
└── this.Category = "general"

Object Initialization

public class Product
{
  public int Id { get; set; }
  public string Name { get; set; }

  public Product(){}

}

---
Product p = new(){ Name = "eggs", Id= "1" }

Static Members

  • Objects get their own copy of data of a class
  • Data can also be stored at class level
  • aka static data: children objects can access Parent Class static member
public class Product
{
  public static int StockTreshold = 5;
  public static void ChangeStockTreshold(int ChangeStockTreshold)
  {
    //Static data exists without object creation,
    //Static method can access static data wo instantiation
  }
}

Writing a Unit Test

A-A-A Method

public void IncreaseStock_CorrectAmountInStock()
{
  //Arrange
  Product product = new product();

  //Act
  product.IncreaseStock(100);

  //Assert
  Assert.Equal(100, product.AmountInStock);
}