VB.NET 怎样才算是一个完整的类？

要满足怎样的要求？ 需要哪些元素？？

我写的这个错在哪里？
为井字游戏写的库
写的不怎么好，准备边写边调的’但是却在模块里不能创建引用

Public Class Ctictactoe
Private m As Integer(,)
Private i, j As Integer
Private output As String = ""
Private count As Integer = 1

Public Sub New()

m = New Integer(2, 2) {{-1, -2, -3}, {-4, -5, -6}, {-7, -8, -9}}
End Sub

Public Sub A(ByVal s As Integer, ByVal k As Integer)
i = s
j = k
If m(i, j) < 0 Then
m(i, j) = 1
count += 1
output += "Play1 get the palce(" & i & "," & j & ")" & vbCrLf
Else
output += "you cannot take this palce" & vbCrLf

End If

End Sub

Public Sub B(ByVal s As Integer, ByVal k As Integer)
i = s
j = k
If m(i, j) < 0 Then

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