static void Main(string[] args)
{
Console.WriteLine("Create an Array type collection of Animal " +
"objects and use it:");
Animal[] animalArray = new Animal[2];
Cow myCow1 = new Cow("Deirdre");
animalArray[0] = myCow1;
animalArray[1] = new Chicken("Ken");
foreach (Animal myAnimal in animalArray)
{
Console.WriteLine("New {0} object added to Array collection, " +
"Name = {1}", myAnimal.ToString(), myAnimal.Name);
}
Console.WriteLine("Array collection contains {0} objects.",
animalArray.Length);
animalArray[0].Feed();
((Chicken)animalArray[1]).LayEgg();
Console.WriteLine();
Console.WriteLine("Create an ArrayList type collection of Animal " +
"objects and use it:");
ArrayList animalArrayList = new ArrayList();
Cow myCow2 = new Cow("Hayley");
animalArrayList.Add(myCow2);
animalArrayList.Add(new Chicken("Roy"));
foreach (Animal myAnimal in animalArrayList)
{
Console.WriteLine("New {0} object added to ArrayList collection," +
" Name = {1}", myAnimal.ToString(), myAnimal.Name);
}
Console.WriteLine("ArrayList collection contains {0} objects.",
animalArrayList.Count);
((Animal)animalArrayList[0]).Feed();
((Chicken)animalArrayList[1]).LayEgg();
Console.WriteLine();
Console.WriteLine("Additional manipulation of ArrayList:");
animalArrayList.RemoveAt(0);
((Animal)animalArrayList[0]).Feed();
animalArrayList.AddRange(animalArray);
((Chicken)animalArrayList[2]).LayEgg();
Console.WriteLine("The animal called {0} is at index {1}.",
myCow1.Name, animalArrayList.IndexOf(myCow1));
myCow1.Name = "Janice";
Console.WriteLine("The animal is now called {0}.",
((Animal)animalArrayList[1]).Name);
Console.ReadKey();
}
static void Main(string[] args)
{
Console.WriteLine ("Create an Array type collection of Animal " +
"objects and use it:");
// Создание коллекции типа Array из объектов
// Animal и ее использование
Animal[] animalArray = new Animal[2];
Cow myCow1 = new Cow("Deirdre");
animalArray[0] = myCow1;
animalArray[1] = new Chicken ("Ken") ;
foreach (Animal myAnimal in animalArray)
{
Console.WriteLine("New {0} object added to Array collection, " +
"Name = {1}", myAnimal.ToString() , myAnimal.Name) ;
// В коллекцию Array добавлен новый объект
}
Console.WriteLine("Array collection contains {0} objects.", animalArray.Length);
// Вывод количества объектов в коллекции Array
animalArray[0].Feed();
((Chicken)animalArray[1]).LayEgg();
Console.WriteLine();
Console.WriteLine("Create an ArrayList type collection of Animal " + "objects and use it:") ;
ArrayList animalArrayList = new ArrayList () ;
Cow myCow2 = new Cow("Hayley");
animalArrayList.Add(myCow2);
animalArrayList.Add(new Chicken ("Roy"));
foreach (Animal myAnimal in animalArrayList)
{
Console.WriteLine ("New {0} object added to ArrayList collection," +
" Name = {1}", myAnimal.ToString() , myAnimal.Name) ;
}
Console.WriteLine("ArrayList collection contains {0} objects.",
animalArrayList.Count);
((Animal)animalArrayList[0]).Feed();
((Chicken)animalArrayList[1]).LayEgg();
Console.WriteLine();
Console. WriteLine ("Additional manipulation of ArrayList:") ;
// Дополнительное манипулирование коллекцией ArrayList
animalArrayList.RemoveAt(0);
((Animal)animalArrayList[0]).Feed();
animalArrayList.AddRange(animalArray);
((Chicken)animalArrayList[2]).LayEgg();
Console.WriteLine("The animal called {0} is at index {1}.",
myCow1.Name, animalArrayList.IndexOf(myCow1));
// Вывод животных и позиций
myCow1.Name = "Janice";
Console.WriteLine("The animal is now called {0}.", ((Animal) animalArrayList[1]).Name) ;
// Вывод животных
Console.ReadKey();
}
static void Main(string[] args)
{
int testInt = 3;
object testObj = testInt;
int testInt2 = (int)testObj;
Console.WriteLine("Create an Array type collection of Animal " +
"objects and use it:");
Animal[] animalArray = new Animal[2];
Cow myCow1 = new Cow("Lea");
animalArray[0] = myCow1;
animalArray[1] = new Chicken("Noa");
foreach (var animal in animalArray)
{
Console.WriteLine($"New {animal.ToString()} object added to Array" +
$" collection, Name = {animal.Name}");
}
Console.WriteLine($"Array collection contains {animalArray.Length} objects");
animalArray[0].Feed();
((Chicken)animalArray[1]).LayEgg();
// animalArray[1].LayEgg();
Console.WriteLine();
Console.WriteLine("Create an ArrayList type collection of Animal " +
"objects and use it");
// 无需初始化大小
ArrayList animaList = new ArrayList
{
new Cow("Rual"),
new Chicken("Andrea")
};
// 这里,如果使用var进行循环的话, 直接使用animal.Name会提示错误
// 因为 使用var,animal会是object格式
// 所以这里我添加了强转
// ArrayList实现了IEnumerable接口
foreach (var animal in animaList)
{
Console.WriteLine($"new {animal.ToString()} object added to ArrayList " +
$"collection, Name = {((Animal)animal).Name}");
}
// Count-->ICollection接口
Console.WriteLine($"ArrayList collection contains {animaList.Count}" +
"objects");
// ArrayList集合是System.Object对象的集合(通过多态性赋给Animal对象),所以必须对所有的项进行数据类型转换
((Animal)animaList[0]).Feed();
((Chicken)animaList[1]).LayEgg();
Console.WriteLine();
Console.WriteLine("Additional manipulation of ArrayList:");
animaList.RemoveAt(0);
((Animal)animaList[0]).Feed();
animaList.AddRange(animalArray);
((Chicken)animaList[2]).LayEgg();
Console.WriteLine($"The animal called {myCow1.Name} is at " +
$"index {animaList.IndexOf(myCow1)}.");
myCow1.Name = "Mary";
Console.WriteLine("The animal is now " +
$"called {((Animal)animaList[1]).Name}.");
Console.WriteLine("--------------CollectionBaseAnimal------------------");
CollectionBaseAnimal cbAnimal = new CollectionBaseAnimal();
cbAnimal.Add(new Cow("Donna"));
cbAnimal.Add(new Chicken("Kevin"));
foreach (Animal al in cbAnimal)
{
al.Feed();
}
// 定义了public Animal this[int animalIndex]这个方法之后
// 才可以使用 cbAnimal[0]这种索引方式
Console.WriteLine(cbAnimal[0].ToString());
Console.ReadKey();
}
static void Main(string[] args)
{
//第一行：创建一个数组类型，并使用
//第二行：对Animal进行实例化此处的数组大小要根据内容设定，不然会报错
//第三行：对Cow实例化，使用带参函数，体现出了面向对象开发的多态性
//第四行：
/*分别对数组对象复制，第一个将myCow1（一个对象，经过Cow实例化后得到的返回值）
*派生类（Cow）
* public Cow(string newName): base(newName){}
*基类
* public Animal(string newName)
* {
* name = newName;
* }
* 赋值给数组第一个变量
* 结果：Deirdre
*/
//第五行：
/*
* 此处直接获得Chicken里的带一个参数的返回值对象
* public Chicken(string newName): base(newName){}
* 结果：Ken
*/
Console.WriteLine("Create an Array type collection of Animal object and use it:");
Animal[] animalArray = new Animal[2];
Cow myCow1 = new Cow("Deirdre");
animalArray[0] = myCow1;
animalArray[1] = new Chicken("Ken");
//第一行：使用迭代循环，并定义了myAnimal类型为Animal类型
//第二行：输出myAnimal的类型和所带属性
//第三行：输出animalArray数组长度
//第四行：调用Animal自带的Feed（）函数
//第五行：调用Chicken里的LayEgg（）方法，由于animalArray本来是Animal类型，所以调用Chicken的方法，要进行强制类型转换
foreach (Animal myAnimal in animalArray)
{
Console.WriteLine("New {0} object added to Array collection Name = {1}", myAnimal.ToString(), myAnimal.Name);
}
Console.WriteLine("Array collection contains {0} objects.", animalArray.Length);
animalArray[0].Feed();
((Chicken)animalArray[1]).LayEgg();
Console.WriteLine();
//第二个集合是System.Collection.ArrayList类
Console.WriteLine("Create an ArrayList type collection of Animal objects and use it:");
ArrayList animalArrayList = new ArrayList();
Cow myCow2 = new Cow("Hayley");
animalArrayList.Add(myCow2);
animalArrayList.Add(new Chicken("Roy"));
foreach (Animal myAnimal in animalArrayList)
{
Console.WriteLine("New {0} object added to ArrayList collection Name = {1}", myAnimal.ToString(), myAnimal.Name);
}
Console.WriteLine("ArrayList colleciton contains {0} objects.", animalArrayList.Count);
((Animal)animalArrayList[0]).Feed();
((Chicken)animalArrayList[1]).LayEgg();
Console.WriteLine();
//利用了一些ArrayList集合功能超出了Array集合的功能范围
Console.WriteLine("Additional manipulation of ArrayList:");
animalArrayList.RemoveAt(0);
((Animal)animalArrayList[0]).Feed();
animalArrayList.AddRange(animalArray);
((Chicken)animalArrayList[2]).LayEgg();
Console.WriteLine("The animal called{0} is at index {1}.", myCow1.Name, animalArrayList.IndexOf(myCow1));
myCow1.Name = "Janice";
Console.WriteLine("The animal is now called {0}.", ((Cow)animalArrayList[1]).Name);
Console.ReadKey();
}
