Iterating over a map entryset

Question

I need to iterate over the entry set of a map from which I do not know its parameterized types.

When iterating over such entryset, why this does not compile ?

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Answer 1

It is because you use the raw type Map, therefore map.entrySet() gets you a non-parametrized Set which in return yields Object on iteration, not Entry.

A simple, but elegant solution is to use Map, which will still allow you to pass ANY Map, but on the other hand forces map.entrySet() to have a return value of Set:

public void test(Map map) {        
    for(Entry e : map.entrySet()){
        Object key = e.getKey();
        Object value = e.getValue();
    }       
}