Array of Maps without generic or warnings?

843793

How would I create an array of maps without getting an error about a generic type or a warning?

This will give me an error.

HashMap<Integer,Integer> test = new HashMap<Integer,Integer>[5];

This will give me a warning.

HashMap<Integer,Integer> test = new HashMap[5];

843793

Dennis_Martinez wrote:
How would I create an array of maps without getting an error about a generic type or a warning?

You would not, because it's inherently unsafe; use a list.

With kind regards
Ben

843793

Could I see an example? I'm a little lost on doing so.

843793

Dennis_Martinez wrote:
Could I see an example? I'm a little lost on doing so.

I suspect you know how to use lists and ask for an example demonstrating the inherent unsafety. So here it is:

List<String>[] generic = new List<String>[1]; // assume this works
List<Integer> ints = new ArrayList<Integer>();
ints.add(42);

Object[] o = generic;
o[0] = ints; // this should not work, but it does (erasure)

List<String> strings = generic[0]; // really it's a list of Integers, ohoh

// now you pass that list somewhere completely unrelated and try to get an element:
String s = strings.get(0); // ClassCastException

Compare this to:

String[] strings = new String[1];
Object[] objects = strings;
objects[0] = 42; // ArrayStoreException

With kind regards
Ben