C# |从集合中创建堆栈
栈代表一个 后进先出 的集合对象。当您需要后进先出访问项目时，可以使用它。当你在列表中添加一个项目时，它被称为推动项目，当你移除它时，它被称为弹出项目。创建堆栈意味着向堆栈中添加项目。堆叠< T >。推(对象)方法用于在堆栈顶部插入一个对象。
属性:
- 堆栈的容量是堆栈可以容纳的元素数量。随着元素添加到堆栈中，容量会根据需要通过重新分配自动增加。
- 如果计数小于堆栈的容量，推送是一个0(1)操作。如果需要增加容量来容纳新元素，Push 将成为 O(n) 操作，其中 n 为 Count。Pop 是一个 O(1) 操作。
- 堆栈接受 null 作为有效值，并允许重复元素。
语法:
public virtual void Push (object obj);
参数:
物体类型系统。对象是推上堆栈< T >。该值可以是空值。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to Create a Stack
// from a collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack of strings
Stack<string> myStack1 = new Stack<string>();
// Inserting the elements into the Stack
myStack1.Push("GeeksforGeeks");
myStack1.Push("is");
myStack1.Push("the");
myStack1.Push("best");
myStack1.Push("website");
// Displaying the count of elements
// contained in the myStack1
Console.Write("Total number of elements in the Stack 1 are : ");
Console.WriteLine(myStack1.Count);
// Displaying the elements in Stack myStack1
foreach(string str in myStack1)
{
Console.WriteLine(str);
}
// Creating a Stack from a collection
Stack<string> myStack2 = new Stack<string>(myStack1.ToArray());
// Displaying the count of elements
// contained in the myStack2
Console.Write("Total number of elements in the Stack 2 are : ");
Console.WriteLine(myStack2.Count);
// Displaying the elements in Stack myStack2
foreach(string str in myStack2)
{
Console.WriteLine(str);
}
}
}
Output:
Total number of elements in the Stack 1 are : 5
website
best
the
is
GeeksforGeeks
Total number of elements in the Stack 2 are : 5
GeeksforGeeks
is
the
best
website
例 2:
// C# code to Create a Stack
// from a collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack of Integers
Stack<int> myStack1 = new Stack<int>();
// Inserting the elements into the Stack
myStack1.Push(5);
myStack1.Push(10);
myStack1.Push(15);
myStack1.Push(20);
myStack1.Push(25);
// Displaying the count of elements
// contained in the myStack1
Console.Write("Total number of elements in the Stack 1 are : ");
Console.WriteLine(myStack1.Count);
// Displaying the elements in Stack myStack1
foreach(int i in myStack1)
{
Console.WriteLine(i);
}
// Creating a Stack from a collection
Stack<int> myStack2 = new Stack<int>(myStack1.ToArray());
// Displaying the count of elements
// contained in the myStack2
Console.Write("Total number of elements in the Stack 2 are : ");
Console.WriteLine(myStack2.Count);
// Displaying the elements in Stack myStack2
foreach(int i in myStack2)
{
Console.WriteLine(i);
}
}
}
Output:
Total number of elements in the Stack 1 are : 5
25
20
15
10
5
Total number of elements in the Stack 2 are : 5
5
10
15
20
25
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