Question

Java Programming

Q4 a. List five common examples of exceptions b. What is "resource leak" c. What happens if several catch blocks match the type of thrown object? d. What is the key reason for using finally blocks?

Answer 1

sol:

a) 1. ArithmeticException:

           when error occurred in arithmetic operations this exception occurs

    2. ArrayIndexOutOfBoundsException

            when array accessed with illegal index (that is index is greater or equal to size of array ) this exception

           occurs

3. IOException

        if input output operation failed, this exception occurs

    4. NoSuchFieldException

       if the field doesn't exist in class this exception occurs

    5. FileNotFoundException

           if the file is not accessiable this exception occurs

b) Resource leak:

Leak occurs when you are not close a reader, scanner, buffer, or another process that uses resources and      

     needs to clean them up out of memory. Then call scanner. close(), after we can use the Scanner for whatever

   we want to do with scanner. This leak is called resource leak.

c) First matching catch block executed, after the try block is executed.

d) Finally block is used to execute important code such as closing connection, stream etc. It always executed

     whether exception is handled or not.