Exception Handling - Kotlin

An exception is an undesired or unexpected event that arises during programme execution, or run time, that interferes with the regular flow of the instructions in the programme . Exception handling is a method by which we may manage mistakes and avert programme crashes that could occur during runtime.

There are two type of exceptions-

1. Checked Exception - This exception come from while code in run time like IOException.

2. UnChecked Exception - This exception come from run time like NullPointerException,etc

Common exception  mentioned below

• NullPointerException: when object is null then execute this Exception.
• ArithmeticException: when any digit divide by zero then execute this exception
• SecurityException: it is thrown to indicate security violation.
• ArrayIndexOutofBoundException: it is throw when array of bound exception.

Exception of arrayIndexoutofboundException :

Output

Kotlin try-catch block-

In Kotlin, we used a try-catch block for exception handling in the program, try block writing the code, and then throwing exceptions while in the catch block.  

Syntax

 try {
   // code that can throw exception
 } catch(e: ExceptionName) {
   // catch the exception 
 }

•  ArithmeticException

  fun main(args : Array<String>){ 
  try{ 
  var num = 70 / 0
  } 
  catch(e: ArithmeticException){ 
 
  println("Divide by zero not allowed") 
  } 
 } 

Output 

 Divide by zero not allowed

•  Finally block

 un main(args : Array<String>){ 
  try{ 
  var ar = arrayOf(1,3,3,4,5) 
  var int = ar[7] 
  println(int) 
  } 
  finally { 
  println("This block always executes") 
  } 
 }

Happy coding!