Val number42: Long = number1 // Type mismatch: inferred type is Int but Long was expected This means that an Int variable cannot be converted to a Long variable without an explicit cast or type conversion: // this code is invalid in Kotlin On the contrary, Kotlin does not support implicit type conversion from smaller to larger types. At the end of the assignment, number2 is a long type variable storing the long representation of the number1 value. During the assignment, Java performs an implicit type cast to convert number1 from an int to a long type. This Java snippet is valid and results in no errors. ![]() Long number2 = number1 // implicit type conversion performed For example, an int variable can be assigned to a long variable with no explicit casts: // this code is valid in Java In detail, Java supports implicit type conversion from smaller to larger types. Since most Kotlin developers are former Java developers or still use both technologies, it is worth pointing out the differences between the two languages when it comes to type casting. This is why you should know how to use them properly, what to expect from them, and how to prevent or handle errors when they occur. Consequently, an unexpected cast may lead to exceptions and fatal errors. Keep in mind that type casting is an error-prone operation and should not be performed lightheartedly. A larger type is a type that occupies more bytes in memory or represents a parent of the current type in an inheritance hierarchy. Similarly, converting a type to a larger type is called upcasting. A smaller type is a type that occupies fewer bytes in memory or represents a child of the current type in an inheritance hierarchy. An example of a type cast operation is the transformation of an integer into a string.Ĭonverting a type to a smaller type is called downcasting. ![]() Also, in some cases, it can be performed automatically behind the scenes by the interpreter or compiler. This generally happens through some operators or particular syntax. Type casting, also called type conversion, is the process of converting a variable from one data type to another.
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