从两个变量引用相同的数组

由于数组是引用类型，因此可以将多个变量指向同一个数组对象。

 placeholderCopyDim array1() As Integer = {1, 2, 3}
Dim array2() As Integer = array1
array1(0) = 4
Console.WriteLine(String.Join(", ", array2))  ' Writes "4, 2, 3"