Android Question compare array?

[DaOne]

I am attempting to compare one array to another and make sure they do not match. What is the proper way to do this? My example does not work.

Dim Array1(10) As String
Dim Array2(10) As String

If Array1 <> Array2 Then
   Do something
End If

 

[LucaMs]

Array1 <> Array2 works well.

Try:

Array1 = Array2 ' now the arrays have the same content.

log(Array1 = Array2)

Otherwise, you must compare the individual elements in a loop

 

[stevel05]

Array1 = Array2 set's the arrays to look at the same array, therefore array1 = array2 will always be true. If you change array1, array2 will change as well.

You can use java.util.Arrays with JavaObject to do the comparison:

Public Sub EqualsObjArr(A() As Object, A2() As Object) As Boolean
    Dim JO As JavaObject
    JO.InitializeStatic("java.util.Arrays")
    Return JO.RunMethod("equals",Array As Object(A, A2))
End Sub

Other types can of array be compared as well as object(), take a look at the documentation: http://developer.android.com/reference/java/util/Arrays.html

 

[DaOne]

Thanks guys, I just used a For loop to set a flag if any of the elements did not match.

 

[LucaMs]

Array1 = Array2 set's the arrays to look at the same array, therefore array1 = array2 will always be true. If you change array1, array2 will change as well.

You can use java.util.Arrays with JavaObject to do the comparison:

Public Sub EqualsObjArr(A() As Object, A2() As Object) As Boolean
    Dim JO As JavaObject
    JO.InitializeStatic("java.util.Arrays")
    Return JO.RunMethod("equals",Array As Object(A, A2))
End Sub

Other types can of array be compared as well as object(), take a look at the documentation: http://developer.android.com/reference/java/util/Arrays.html

I'm wrong or that function compares the object pointers and then is the same thing?

 

[stevel05]

No the function compares the array contents. Probably similar to the way DaOne has implemented it, although I would guess it would be quicker on large arrays rather than testing each element in this way.

I know when I tested the java.util.Arrays copying, there was minimal improvement over doing it in a loop, I think the compiler must be clever enough to use the native libraries in these cases.