I would like to check whether an object (e.g. someObject) is assignable (cast-able) to a variable of another type (e.g. SpecifiedType). In Java, I can write: someObject instanceof SpecifiedType A related question is finding whether the runtime type of an object is equal to a another type. In Java, I can write: someObject.getClass().equals(SpecifiedType.class) How can … Read more
I have a small table and a certain field contains the type “character varying“. I’m trying to change it to “Integer” but it gives an error that casting is not possible. Is there a way around this or should I just create another table and bring the records into it using a query. The field … Read more
I want to be better about knowing when I should cast. What are the implicit type conversion rules in C++ when adding, multiplying, etc. For example, int + float = ? int * float = ? float * int = ? int / float = ? float / int = ? int / int = … Read more
Upcasting is allowed in Java, however downcasting gives a compile error. The compile error can be removed by adding a cast but would anyway break at the runtime. In this case why Java allows downcasting if it cannot be executed at the runtime? Is there any practical use for this concept? public class demo { … Read more
I am trying to convert my string formatted value to date type with format dd/MM/yyyy. this.Text=”22/11/2009″; DateTime date = DateTime.Parse(this.Text); What is the problem ? It has a second override which asks for IFormatProvider. What is this? Do I need to pass this also? If Yes how to use it for this case? Edit What … Read more
I want to convert a Float to an Int in Swift. Basic casting like this does not work because these types are not primitives, unlike floats and ints in Objective-C var float: Float = 2.2 var integer: Int = float as Float But this produces the following error message: ‘Float’ is not convertible to ‘Int’ … Read more
I know you can convert a String to an number with read: Prelude> read “3” :: Int 3 Prelude> read “3” :: Double 3.0 But how do you grab the String representation of an Int value? 4 Answers 4
Which is the the best way (if there is one) to cast from number to string in Typescript? var page_number:number = 3; window.location.hash = page_number; In this case the compiler throws the error: Type ‘number’ is not assignable to type ‘string’ Because location.hash is a string. window.location.hash = “”+page_number; //casting using “” literal window.location.hash = … Read more
I keep finding both on here and Google people having troubles going from long to int and not the other way around. Yet I’m sure I’m not the only one that has run into this scenario before going from int to Long. The only other answers I’ve found were “Just set it as Long in … Read more
How can I cast an Object to an int in java? 19 Answers 19
