Better Way to Cast Object to Int

How to cast an Object to an int

If you're sure that this object is an Integer :

int i = (Integer) object;

Or, starting from Java 7, you can equivalently write:

int i = (int) object;

Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointerException if your object is null.

This way you assume that your Object is an Integer (the wrapped int) and you unbox it into an int.

int is a primitive so it can't be stored as an Object, the only way is to have an int considered/boxed as an Integer then stored as an Object.

If your object is a String, then you can use the Integer.valueOf() method to convert it into a simple int :

int i = Integer.valueOf((String) object);

It can throw a NumberFormatException if your object isn't really a String with an integer as content.

Resources :

Oracle.com - Autoboxing
Oracle.com - Primitive Data types

On the same topic :

Java: What's the difference between autoboxing and casting?
Autoboxing: So I can write: Integer i = 0; instead of: Integer i = new Integer(0);
Convert Object into primitive int

Better way to cast object to int

You have several options:

(int) — Cast operator. Works if the object already is an integer at some level in the inheritance hierarchy or if there is an implicit conversion defined.
int.Parse()/int.TryParse() — For converting from a string of unknown format.
int.ParseExact()/int.TryParseExact() — For converting from a string in a specific format
Convert.ToInt32() — For converting an object of unknown type. It will use an explicit and implicit conversion or IConvertible implementation if any are defined.
as int? — Note the "?". The as operator is only for reference types, and so I used "?" to signify a Nullable<int>. The "as" operator works like Convert.To____(), but think TryParse() rather than Parse(): it returns null rather than throwing an exception if the conversion fails.

Of these, I would prefer (int) if the object really is just a boxed integer. Otherwise use Convert.ToInt32() in this case.

Note that this is a very general answer: I want to throw some attention to Darren Clark's response because I think it does a good job addressing the specifics here, but came in late and wasn't voted as well yet. He gets my vote for "accepted answer", anyway, for also recommending (int), for pointing out that if it fails (int)(short) might work instead, and for recommending you check your debugger to find out the actual runtime type.

Cast a Java Object to Integer

What you want is:

int ei = ((Integer) entry.getIdentifier()).intValue();

How to cast Object[] to int[] java?

As you have acknowledged in your question, int does not extend Object so the cast makes no sense and the compiler correctly complains.

Likely the safest and easiest way to achieve this is:

Object[] objects = {1, 2, 3, 4};
int[] ints = Arrays.stream(objects).mapToInt(o -> (int)o).toArray();

Not particularly elegant, but then again neither is storing an array of integers in an array of Object :-)

How can i convert an object to an int in Java?

Integer.parseInt()

expects a String. You can use

Integer.parseInt(f.toString())

and override the toString() method in your class.

How do I cast an object to an int in a Converter?

Both Convert.ToInt32 or Int32.Parse should work... If they don't, then the value is definitely not an int ;)

Try to put a breakpoint in your converter to watch the value, it might show you why it doesn't work

Cannot cast from object to int

request.getAttribute returns Object. You cannot cast Object to a primitive type int. But you may cast it to Integer.

python cast object to int

Try to use

...
def __int__(self):
    return self.score
...

test = MyObject(0, 0, 10, 0, 0)
print 10+int(test)

# Will output: 20

in your MyObject class definition.