Return object from HashMap using Iterator

Question

roomCharacters is a HashMap of keys and values (String keys and Character objects).

I need to return a Character from the collection. I have used an Iterator to simply return the first Character it finds, when the method is called.

public Character getCharacter()
{
    Iterator<HashMap.Entry<String, Character>> it = roomCharacters.entrySet().iterator();
    if (it.hasNext())
    {
        HashMap.Entry pair = (Map.Entry)it.next();
        return pair.getValue();
    }        
}

But it fails to compile:

  incompatible types: java.lang.Object cannot be converted to Character

Clearly I've misunderstood something or missed a step. Please advise and explain where I'm going wrong.

antlersoft · Accepted Answer · 2015-06-22 22:05:58Z

2

If you declare your pair variable with the correct type parameters, it will work, and you can get rid of the extra cast:

    HashMap.Entry<String,Character> pair = it.next();

answered Jun 22, 2015 at 22:05

antlersoft

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1 Comment

Tilman Hausherr Over a year ago

@AK83 please press the green checkmark if the answer was helpful.

Mureinik · Accepted Answer · 2015-06-22 22:06:50Z

1

You are missing the generics specification in the definition of pair. Additionally, since it is specified using generics, note that you don't need to cast when assigning its next to pair:

public Character getCharacter()
{
    Iterator<HashMap.Entry<String, Character>> it = roomCharacters.entrySet().iterator();
    if (it.hasNext())
    {
        HashMap.Entry<String, Character> pair = it.next();
        return pair.getValue();
    }        
}

answered Jun 22, 2015 at 22:06

Mureinik

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