how to display two arraylists indexwise

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Dim myarr As New ArrayList
Dim myarr1 As New ArrayList
myarr=[1,2,3] //these values i am adding dynamically
myarr1=[2,2,3]

i want to display result [1,2][2,2][3,3] ....

Can anybody please provide me the code?

Posted 7-Mar-15 7:17am

devchina

Updated 7-Mar-15 7:31am

v2

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Sergey Alexandrovich Kryukov 7-Mar-15 13:24pm

~~This is not called "compare".~~ What have you tried so far?
[EDIT] I edited this comment after the inquirer fixed the question title — thanks.
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-03-07T07:30:00

It's not clear why creating so non-informative output, but this is your choice.

To start with, don't use obsolete ArrayList use System.Collections.Generic.List<>.
Use the property Count to determine the number of elements, find out the minimum between the to and see if one list is shorter, use the minimum count. In a loop for 0 to count − 1, do that extremely simple thing you called "display", whatever it is. If it has to be put in a string, better don't use string type immediately, but collect data in an instance of the mutable counterpart of System.String, System.Text.StringBuilder:
https://msdn.microsoft.com/en-us/library/6sh2ey19%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.text.stringbuilder%28v=vs.110%29.aspx[^].

Do whatever you want with other elements if the lists have different lengths.

—SA

Thomas Daniels · Answer 2 · 2015-03-07T07:35:00

Solution 2

This code should do what you want:

VB.NET

Dim sb As New StringBuilder()
For i As Integer = 0 To CType(Math.Min(myarr.Count, myarr1.Count), Integer) - 1
    sb.AppendFormat("[{0},{1}]", myarr(i), myarr1(i))
Next
Dim output As String = sb.ToString()

Be sure to add Imports System.Text at the top of your code file.

The code uses a StringBuilder[^] to generate the output. The For loop counts to the minimal length of the two ArrayLists.

Posted 7-Mar-15 7:35am

Thomas Daniels

Updated 7-Mar-15 8:27am

v4

Comments

Sergey Alexandrovich Kryukov 7-Mar-15 13:43pm

5ed.
—SA

Thomas Daniels 7-Mar-15 13:46pm

Thanks! I also updated my answer to count to the minimal length, as per your suggestion.

Sergey Alexandrovich Kryukov 7-Mar-15 13:51pm

Great. One little problem is that Math.Min returns double, so you would need to add typecast for other languages; I usually code integer min.
—SA

Thomas Daniels 7-Mar-15 14:28pm

Good point. I added a CType cast.