Questions on Type Convertion

Question

Hi all,
I have a hashmap m. I want to put an object o as the key and an integer as the value. But seems that
m.get(o)
will return an Object, which cannot be converted into primitive type... so what can I do to get the value of integer from the map?
At the same time, can I write something like
if [variable type] is [integer]
put value of variable to another integer
else if [variable type] is [String]
put value of variable to another String
else if [variable type] is [something else]
put value of variable to another variable of same type
.... and so on ?
Thanks in advance!

Answer 1

No, Hashmaps (and in fact all Maps) only take Objects as keys or values. If you need to use a primitive, that's what the primitive wrappers are for:int i = 5;
Object o = new Object();
m.put(o, new Integer(i));
int j = ((Integer) m.get(o)).intValue();so, to answer your question, try something likeint i;
String s;
Object o;
Object val = m.get(key);
if (val instanceof Integer) {
    i = ((Integer)val).intValue();
} else if (val instanceof String) {
    s = (String) val;
} else {
    o = val;
}Robin