Exception Handling, try, catch, throw, and finally

Exception handling is a technique, using which we can handle errors and prevent run time crashes that can stop our program.

There are two types of Exceptions –

1. Checked Exception – Exceptions that are typically set on methods and checked at the compile time, for example, IOException, FileNotFoundException, etc

2. Unchecked Exception – Exceptions that are generally due to logical errors and checked at the run time, for example, NullPointerException, ArrayIndexOutOfBoundException, etc

Kotlin program of throwing an arithmetic exception –

fun main(args : Array<String>){
    var num = 10 / 0      // throws exception
    println(num)
}

Output:

Exception in thread "main" java.lang.ArithmeticException: / by zero

Kotlin try-catch block –

This block must be written within the main or other methods. Try block should be followed by either catch block or finally block or both.

The syntax for try-catch block –

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

Kotlin program of arithmetic exception handling using try-catch block –

import kotlin.ArithmeticException
  
fun main(args : Array<String>){
    try{
        var num = 10 / 0
    }
    catch(e: ArithmeticException){
        // caught and handles it
        println("Divide by zero not allowed")
    }
}

Output:
Divide by zero not allowed

Kotlin program of using finally block with try-catch block-

fun main (args: Array<String>){  
    try {  
        var int = 10 / 0  
        println(int)  
    } catch (e: ArithmeticException) {  
        println(e)  
    } finally {  
        println("This block always executes")  
    }  
}  

Hope you understand the exception handling and syntax of kotlin in the next blog we are going to learn collections in kotlin.

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