Hashmap Long to Integer ClassCastException

Question

The following is my hashmap.

private HashMap<String, Integer> details;
details = new HashMap<>();
details.put("coins", 0);
details.put("score", 0);
details.put("wins", 0);

The following is my get coins method

public int getCoinCount() {
    if(details == null)
        return 0;

    return  details.get("coins").intValue();
}

Now when I run this I get a ClassCastException. The following is the code that is calling it.

int coins =  MyClass.getInstance().getCoinCount();

It says I can't cast a long to an integer! THERE WAS NEVER A MENTION TO A LONG TYPE! WHAT IS GOING ON?

java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
at game.drew.com.respy.User.User.getCoinCount(RespyUser.java:78)
at game.drew.com.game.Gameplay.ProfileFragment.onCreateView(ProfileFragment.java:226)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)

getCoinCount is a method in MyClass. It returns an int. The method definition is above. — Andrew Furniss, Sep 06 '16 at 01:35
Could you show the method of `game.drew.com.game.Gameplay.ProfileFragment#onCreateView`? I think the `int coins = MyClass.getInstance().getCoinCount()` is OK, but then the int value is passed in ProfileFragment, and it raised an exception there. — Mincong Huang, Sep 06 '16 at 02:31
@Drew Furniss refer to this one http://stackoverflow.com/a/29666879/4606122 — FullStack, Sep 06 '16 at 02:48
Cannot reproduce from this code. You must have some other code somewhere that changes the value and uses a `long` or `Long` to do so. — user207421, Sep 06 '16 at 04:17
@MincongHuang but why would the error be taking me to the where it calls getCoinCount? — Andrew Furniss, Sep 06 '16 at 15:40
Nope. It seems like the HashMap value is returning a Long. But why would it if it is a map? I don't use a long type anywhere in my project. @EJP — Andrew Furniss, Sep 06 '16 at 15:41

score -2 · Answer 1 · answered Sep 06 '16 at 01:44

I was hoping your stacktrace would give me more to go off of, unfortunately I'm about as puzzled as you are. This isn't a true fix to your problem, but since you are putting the values into the HashMap as as Integer it might be best to change getCoinCount to also return an Integer and set coins to be an Integer as well.

In the past when I get a primitive value from an Integer I usually end up retrieving it as a long too.

Hashmap Long to Integer ClassCastException

1 Answers1