Thread: How to print out all keys cerrently stored in a HashMap?

I want to write a method to print the all the names of a phone book. phoneBook is a HashMap<String, String> , that has names as keys and phone numbers as values.

Reading the documentation for both HashMap and Set, I have more or less an idea of how it could be done but I cant put it on code..

 
public String getName()
    {
 
        String[] keys = phoneBook.keySet().toArray();
        return keys[0];
 
    }

This is wrong. It doesnt compile saying incompatible types. I was thinking first to manage to succeed to get a key from my phone book and then I change it to print all the keys.
Is this possible with this way of thinking?

Use the API. What does Set.toArray() return?

Nice one...I understood your point. I need the other toArray method that specify the return type Cheers!!!!!

p.s. The Set.toArray() returns an Array of Set? (I ask to confirm that I completely understood)

Did you consult the Set API?