Kotlin throws
Kotlin throws are used to handle exceptions in Kotlin programming language. When an exception occurs in a Kotlin program, it can be thrown using the throw
keyword, and then caught and handled using the try-catch
block.
Here are the steps involved in using Kotlin throws:
Throwing an exception: To throw an exception in Kotlin, use the
throw
keyword followed by the exception object. For example,throw RuntimeException("An error occurred")
throws aRuntimeException
with the message "An error occurred".Catching and handling exceptions: Exceptions thrown using the
throw
keyword can be caught and handled using thetry-catch
block. Thetry
block contains the code that may throw an exception, while thecatch
block handles the exception if it occurs. Multiplecatch
blocks can be used to handle different types of exceptions.
kotlin
try {
// Code that may throw an exception
} catch (e: Exception) {
// Handling the exception
}
If an exception occurs in the try
block, the code execution jumps to the corresponding catch
block. The exception object is assigned to the variable specified after the catch
keyword (in the example above, e
is the exception variable).
- Finally block: The
finally
block is optional and can be used to specify code that should be executed regardless of whether an exception occurred or not. The code inside thefinally
block is executed after thetry
block and anycatch
blocks.
kotlin
try {
// Code that may throw an exception
} catch (e: Exception) {
// Handling the exception
} finally {
// Code that will be executed regardless of whether an exception occurred or not
}
The finally
block is commonly used to release resources or perform cleanup tasks that are necessary, regardless of the outcome of the try-catch
block.
That's it! These are the steps involved in using Kotlin throws to handle exceptions in Kotlin programming language.