VB.Net - Stack

It represents a last-in, first-out collection of objects. It is used when you need a last-in, first-out access of items. When you add an item in the list, it is called pushing the item, and when you remove it, it is called popping the item.

Properties and Methods of the Stack Class

The following table lists some of the commonly used properties of the Stack class −

The following table lists some of the commonly used methods of the Stack class −

Example

The following example demonstrates use of Stack −

Module collections
   Sub Main()
      Dim st As Stack = New Stack()
      st.Push("A")
      st.Push("M")
      st.Push("G")
      st.Push("W")
      Console.WriteLine("Current stack: ")
      Dim c As Char
      
      For Each c In st
         Console.Write(c + " ")
      Next c
      Console.WriteLine()
      st.Push("V")
      st.Push("H")
      Console.WriteLine("The next poppable value in stack: {0}", st.Peek())
      Console.WriteLine("Current stack: ")
      
      For Each c In st
         Console.Write(c + " ")
      Next c
      Console.WriteLine()
      Console.WriteLine("Removing values ")
      st.Pop()
      st.Pop()
      st.Pop()
      Console.WriteLine("Current stack: ")
      
      For Each c In st
         Console.Write(c + " ")
      Next c
      Console.ReadKey()
   End Sub
End Module

When the above code is compiled and executed, it produces the following result −

Current stack: 
W G M A
The next poppable value in stack: H
Current stack: 
H V W G M A
Removing values
Current stack: 
G M A

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