Exceptions in Java

 

Exception is the unwanted or the unexpected event ,Which occurs during the execution of a program and disturbs the normal flow of execution.

Errors are because of System failure.

Exception vs Error

Exception                                                                                                                 Error
1.Exception occur  because of programs.                             1. Error occur  because of Lack of System                                                                                                          resources not because of the programs                                                                                                              hence programmer can not do anything.                             
2.Exceptions are recoverable .                                              2.Errors can not be  recoverable.

3.We can recover exception by handling it.                         3.We have to contact with system                                                                                                                         administrator. 

4.Exceptions are of two types                                             4. Errors are of type Runtime only.

     a.Checked Exception(Compiletime)

      b.Unchecked Exception(runtime)

5.SQLException,IOException,etc                                       5.VirtualMemoryError, StackoverflowError                                                     

Checked Exception vs Unchecked Exception

Checked Exception

1.Checked Exception are also know as compile time  Exception.

2.Compiler can check these Exceptions  at the time of compilation

3.SQLException,IOException,FilenotfoundException,etc comes under this Exception.

UnCheckedException

1.UncheckedExceptions are also known as runtime Exception.

2.The Exceptions which compiler ignores are called unchecked exception.

3.NullpointerExceptios,ArithmaticException,etc comes under unchecked Exceptions.