How to cast an Object to an int

Question

How can I cast an Object to an int in java?

Answer 1

@Deprecated
public static int toInt(Object obj)
{
    if (obj instanceof String)
    {
         return Integer.parseInt((String) obj);
    } else if (obj instanceof Number)
    {
         return ((Number) obj).intValue();
    } else
    {
         String toString = obj.toString();
         if (toString.matches("-?\d+"))
         {
              return Integer.parseInt(toString);
         }
         throw new IllegalArgumentException("This Object doesn't represent an int");
    }
}

As you can see, this isn't a very efficient way of doing it. You simply have to be sure of what kind of object you have. Then convert it to an int the right way.