Public Class Boat
    Private RegistrationNo As Integer
    Private length As Integer
    Private manufacture As String
    Private year As Integer
    Public Sub New()
        RegistrationNo = 1
        length = 150
        manufacture = "第一造船廠"
        year = 1982
    End Sub
    Public Sub New(ByVal R As Integer, ByVal l As Integer, ByVal m As String, ByVal y As Integer)
        RegistrationNo = R
        length = l
        manufacture = m
        year = y
    End Sub
    Public Property mRegistrationNo() As Integer
        Get
            Return RegistrationNo
        End Get
        Set(ByVal Value As Integer)
            RegistrationNo = Value
        End Set
    End Property
    Public Property mlength() As Integer
        Get
            Return length
        End Get
        Set(ByVal Value As Integer)
            length = Value
        End Set
    End Property
    Public Property mManufacture() As String
        Get
            Return manufacture
        End Get
        Set(ByVal Value As String)
            manufacture = Value
        End Set
    End Property
    Public Property mYear() As Integer
        Get
            Return year
        End Get
        Set(ByVal Value As Integer)
            year = Value
        End Set
    End Property
    Public Function toallstring() As String

        Dim str As String

        str = String.Format("船的注冊號={0}", mRegistrationNo) & vbNewLine

        str += String.Format("船的長度={0}", mlength) & vbNewLine

        str += String.Format("船的制造商={0}", mManufacture) & vbNewLine

        str += String.Format("船的生產年代={0}", mYear) & vbNewLine
       
        Return str

    End Function
    Class Test

        Shared Sub Main()

            Dim output As String

            Dim R1 As Boat = New Boat
            output = "r1:" + vbNewLine
            output += R1.toallstring()
            MessageBox.Show(output, "輸出結果")


            Dim R2 As Boat = New Boat
            output = "r2:" + vbNewLine
            output += R2.toallstring()
            MessageBox.Show(output, "輸出結果")


            Dim R3 As Boat = New Boat
            output = "r3:" + vbNewLine
            output += R3.toallstring()
            MessageBox.Show(output, "輸出結果")

        End Sub

    End Class

End Class