Question

I have a custom Map using where Device is an instance of my class named Device.

devices = new HashMap<String, Device>();

I tried several Iterators and for loops suggested at StackOverflow, but all of them seem to produce errors and I don’t know why.

Example errors:

and

Answer 1

Looks like the declaration of devices is incorrect. It should be:

Map<String, Device> devices;

Not the raw (“erased”) type, Map. Modern compilers should give you warnings for using raw types. Take note of compiler warnings.