<p>I am getting very frustrated because I cannot seem to figure out why Collections shuffling is not working properly.</p>

<p>Lets say that I am trying to shuffle the <code>randomizer</code> array.  </p>

<pre><code>int[] randomizer = new int[] {200,300,212,111,6,2332}; 
Collections.shuffle(Arrays.asList(randomizer));
</code></pre>

<p>For some reason the elements stay sorted exactly the same whether or not I call the shuffle method.  Any ideas? </p>

```
Arrays.asList
```
cannot be used with arrays of primitives. Use this instead:
```
```
Integer[] randomizer = new Integer[] {200,300,212,111,6,2332}; 
Collections.shuffle(Arrays.asList(randomizer));
```
```
The same rule applies to most classes in the collections framework, in that you can't use primitive types.
The original code (with
```
int[]
```
) compiled fine, but did not work as intended, because of the behaviour of the variadic method
```
asList
```
: it just makes a one-element list, with the
```
int
```
array as its only member.