Why I m getting Unreported Exception

Question

can you please why error comes in line 13 as unreported exception ,must be caught pr declared to be thrown

class Demo {
    public static void main(String args[]         


        

Answer 1

At the last line of your code you are throwing an exception but there is nothing handling it. You must do one of two:

1. Surround it with a try/catch block
2. Use the throws keyword in the method's signature. See this SO question: The throws keyword for exceptions in Java

In addition this question: Why is “throws Exception” necessary when calling a function?

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Secondly after adding it the code will compile but when executed will still throw an exception:

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

Reason is that in the catch blocks you are re-throwing the exception.