1.)What happens if main() is written with out String args[]?
--The code compiles but JVM cannot run it,as it cannot see the main() with String args[]
2.)What are checked exceptions?
--Exceptions that are checked by compiler at the compilation time are called as checked exceptions.
3.)What are unchecked exceptions?
--Exceptions that are checked by JVM are called as unchecked exceptions.
4.)What is Throwable?
--Throwable is a class that represents all errors and exceptions that occur in java
5.)What is the superclass for all exceptions?
--Exception is the superclass for all the exceptions.
6)What is the difference between exception and an error?
--Exception is a situation which can be handled using try catch
--Error cannot be handled by the programmer and leads to abnormal program termination.
Ex: OutOfMemory
--Error cannot be handled by the programmer and leads to abnormal program termination.
Ex: OutOfMemory
7)Difference between throws and throw?
--throws clause is used when the programmer does not want to handle the exception and throw it out of method.
--throw clause is used when the programmer wants to throw an exception explicitly and wants to handle it using catch block.
8)Can we rethrow an exception??
--Yes ,we can rethrow an exception from catch block to another class where it can be handled
Points on exceptional handling
8)Can we rethrow an exception??
--Yes ,we can rethrow an exception from catch block to another class where it can be handled
Points on exceptional handling
- Exceptions can be handled using try and catch blocks.
- A try block can be followed with any number of catch blocks.
- Statements are not allowed in between try and catch blocks
- It is possible to handle multiple exceptions using multiple catch blocks
- Catch block cannot exist independently ..it should be preceded with a try block whereas try block need not be followed compulsorily by catch block ,a finally block may follow it.
- Nested try blocks are supported in java
