Arrays.asList() gives a list with wrong size

Try this out for fun.

int[] i = new int[]{1, 2, 3};  
System.out.println(Arrays.asList(i).size());

Integer[] ii = new Integer[]{1, 2, 3};  
System.out.println(Arrays.asList(ii).size());  

Output:
1
3

What the hell, Java? This is totally unexpected behaviour!

In this case Java is being a bit pedantic. See, Collections can contain only contain Objects, and an int is not an Object but int[] is an Object, so that’s why you get a list with only 1 element.

But really, the language should protect against these kinds of needle- in-a-haystack bugs.