VB.Net/Data Structure/Array Multi Dimension
Содержание
- 1 Array Performance Test: Two-dimensional array
- 2 Array Performance Test: Two-dimensional Array and SetValue(i, i)
- 3 Define and initialize the multi-dimensional array
- 4 Define and Init two dimensional array
- 5 Initializing a jagged array, one in which the length of each array differs
- 6 Initializing multidimensional arrays: rectangular two-dimensional array
- 7 Jagged two-dimensional array
- 8 Seclare a 4x3 Integer array
- 9 Two Dimensional Rectangle Array
- 10 Two dimension array Demo
Array Performance Test: Two-dimensional array
<source lang="vbnet"> Imports System Imports System.Collections Public Class MainClass
Shared Sub Main(ByVal args As String())
Dim start_time As DateTime
Dim stop_time As DateTime
Dim elapsed_time As TimeSpan
" Get the number of items.
Dim num_items As Integer = 1000000
" Two-dimensional array.
Dim array2(0 To 0, 0 To num_items - 1) As Integer
start_time = Now
For i As Integer = 0 To num_items - 1
array2(0, i) = i
Next i
stop_time = Now
elapsed_time = stop_time.Subtract(start_time)
Console.WriteLine( elapsed_time.TotalSeconds().ToString )
End Sub
End Class
</source>
Array Performance Test: Two-dimensional Array and SetValue(i, i)
<source lang="vbnet"> Imports System Imports System.Collections Public Class MainClass
Shared Sub Main(ByVal args As String())
Dim start_time As DateTime
Dim stop_time As DateTime
Dim elapsed_time As TimeSpan
" Get the number of items.
Dim num_items As Integer = 1000000
" Two-dimensional Array.
Dim array4 As Array = _
Array.CreateInstance(GetType(Integer), 1, num_items)
start_time = Now
For i As Integer = 0 To num_items - 1
array4.SetValue(i, 0, i)
Next i
stop_time = Now
elapsed_time = stop_time.Subtract(start_time)
Console.WriteLine( elapsed_time.TotalSeconds().ToString )
End Sub
End Class
</source>
Define and initialize the multi-dimensional array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main()
Const rowsUB As Integer = 4
Const columnsUB As Integer = 3
Dim rectangularArray As Integer(,) = _
{{0, 1, 2}, {3, 4, 5}, {6, 7, 8}, {9, 10, 11}}
"report the contents of the array
Dim i As Integer
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
Console.WriteLine( _
"rectangularArray[{0},{1}] = {2}", _
i, j, rectangularArray(i, j))
Next j
Next i
End Sub
End Class
</source>
Define and Init two dimensional array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main(ByVal args As String())
Const rowsUB As Integer = 4
Const columnsUB As Integer = 3
" define and initialize the array
Dim rectangularArray As Integer(,) = _
{{0, 1, 2}, {3, 4, 5}, {6, 7, 8}, {9, 10, 11}}
" report the contents of the array
Dim i As Integer
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
Console.WriteLine( _
"rectangularArray[{0},{1}] = {2}", _
i, j, rectangularArray(i, j))
Next j
Next i
End Sub
End Class
</source>
Initializing a jagged array, one in which the length of each array differs
<source lang="vbnet"> Imports System Imports System.Data Imports System.Collections public class MainClass
Shared Sub Main()
Dim c()() As Integer = {New Integer() {1, 2}, New Integer() {1, 2, 3}}
c(1) = New Integer() {4, 5}
Console.WriteLine(c(1)(1))
c(1) = System.Array.CreateInstance(GetType(System.Int32), 10)
Console.WriteLine(c(1)(1))
Dim d() As Integer = {6, 7}
c(1) = d
Console.WriteLine(c(1)(1))
End Sub
End Class
</source>
Initializing multidimensional arrays: rectangular two-dimensional array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main(ByVal args As String())
Dim i, j As Integer
"
Dim array1 As Integer(,)
array1 = New Integer(,) {{1, 2, 3}, {4, 5, 6}}
Console.WriteLine( "Values in array1 by row are " )
For i = 0 To array1.GetUpperBound(0)
For j = 0 To array1.GetUpperBound(1)
Console.WriteLine( array1(i, j) )
Next
Next
End Sub
End Class
</source>
Jagged two-dimensional array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main(ByVal args As String())
Dim i, j As Integer
" jagged two-dimensional array
Dim array2 As Integer()() = New Integer(2)() {}
array2(0) = New Integer() {1, 2}
array2(1) = New Integer() {3}
array2(2) = New Integer() {4, 5, 6}
Console.WriteLine( "Values in array2 by row are ")
For i = 0 To array2.GetUpperBound(0)
For j = 0 To array2(i).GetUpperBound(0)
Console.WriteLine( array2(i)(j) )
Next
Next End Sub
End Class
</source>
Seclare a 4x3 Integer array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main()
Const rowsUB As Integer = 4
Const columnsUB As Integer = 3
Dim rectangularArray(rowsUB, columnsUB) As Integer
"populate the array
Dim i As Integer
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
rectangularArray(i, j) = i + j
Next j
Next i
"report the contents of the array
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
Console.WriteLine( _
"rectangularArray[{0},{1}] = {2}", _
i, j, rectangularArray(i, j))
Next j
Next i
End Sub
End Class
</source>
Two Dimensional Rectangle Array
<source lang="vbnet"> Imports System Public Class MainClass
Shared Sub Main(ByVal args As String())
Const rowsUB As Integer = 4
Const columnsUB As Integer = 3
" declare a 4x3 Integer array
Dim rectangularArray(rowsUB, columnsUB) As Integer
" populate the array
Dim i As Integer
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
rectangularArray(i, j) = i + j
Next j
Next i
" report the contents of the array
For i = 0 To rowsUB - 1
Dim j As Integer
For j = 0 To columnsUB - 1
Console.WriteLine( _
"rectangularArray[{0},{1}] = {2}", _
i, j, rectangularArray(i, j))
Next j
Next i
End Sub
End Class
</source>
Two dimension array Demo
<source lang="vbnet"> Imports System Imports System.Diagnostics Public Class MainClass
Shared Sub Main()
Dim int_values(,) As Integer = _
{ _
{1, 2, 3}, _
{4, 5, 6} _
}
For i As Integer = 0 To 1
For j As Integer = 0 To 2
Console.Write(int_values(i, j))
Next j
Console.WriteLine("")
Next i
Dim str_values(,,) As String = _
{ _
{ _
{"000", "001", "002"}, _
{"010", "011", "012"} _
}, _
{ _
{"100", "101", "102"}, _
{"110", "111", "112"} _
} _
}
Console.WriteLine("")
For i As Integer = 0 To 1
For j As Integer = 0 To 1
For k As Integer = 0 To 2
Console.Write(str_values(i, j, k) & " ")
Next k
Next j
Console.WriteLine("")
Next i
End Sub
End Class
</source>
