A Type casting is basically a conversion from one type to another. In Dynamic Programming Languages like Scala, it often becomes necessary to cast from type to another.Type Casting in Scala is done using the asInstanceOf method.
- This perspective is required in manifesting beans from an application context file.
- It is also used to cast numeric types.
- It can even be applied in complex codes like communicating with Java and sending it an array of Object instances.
obj1 = obj.asInstanceOf[class];
obj1 is the object to which the casted instance of obj is returned,
obj is the object to be casted, and
class is the name of the class to which obj is to be casted into.
Here, only an object of an extended(child) class can be casted to be an object of its parent class but not vice-versa. If class A extends class B, A’s object can be cast to be an object of class B and B’s object canot be cast to be an object of class A. This method informs the compiler that the value is of the type specified. During runtime, if the value/object supplied is not compatible with the type or class specified, an exception is thrown.
i = 40 is of type java.lang.Integer f = 6.0 is of type java.lang.Float d = 85.2 is of type java.lang.Double c = c is of type java.lang.Character i1 = ( is of type java.lang.Character f1 = 6.0 is of type java.lang.Double d1 = 85.2 is of type java.lang.Float c1 = 99 is of type java.lang.Integer
Value of i : 10 Value of j : 5 Values Changed Value of i : 6 Value of j : 12
In above example p.change(); will be added, the following error would have been occured:
error:value change is not a member of parent.
java.lang.ClassCastException: Parent cannot be cast to Unrelated java.lang.ClassCastException: Parent cannot be cast to Child
- Object Casting in Scala
- Melting and Casting in R Programming
- Scala | Type Inference
- Scala Type Hierarchy
- Scala | Abstract Type members
- Unified Type System In Scala
- Scala Tutorial – Learn Scala with Step By Step Guide
- CSS | :only-of-type Selector
- jQuery | :nth-of-type() Selector
- How to add a method to struct type in Golang?
- Converting a string variable into Boolean, Integer or Float type in Golang
- CSS | :nth-of-type() Selector
- Change Data Type for one or more columns in Pandas Dataframe
- CSS | :nth-last-of-type() Selector
- jQuery | :first-of-type Selector
- jQuery | :last-of-type Selector
- jQuery | :only-of-type Selector
- How to create a Java HashMap of user defined class type?
- jQuery | :nth-last-of-type() Selector
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.