Question

If Integer i = 88, what is the memory address i resides at?

Additionally, if as part of Debugger, id number changes, is it indicative of the fact that a new object was created?

Answer 1

The answer to your second question is yes, the “id” you see in Eclipse’s debugger uniquely identifies an object and so a change in it means a new object was created. So, for example:

Integer i = 55;
Integer j = new Integer(55);
Integer k = Integer.valueOf(55);

Here i and k will have the same id, since they refer to the same object; j will be different.

The memory address of one of these objects is not really a useful piece of information, since objects move around in memory. All you can know is that if i == k, they are the same object. (So here, i == k but i != j).