Java - Exception Handling

Exception Handling:-

        Exception is an abnormal condition, if it is occured in our program, then program will be terminated suddenly.

        To overcome this problem, we have some exception handlers in java program, such as try,catch,throw,throws and finally.

        Exceptions are occured at runtime.

        Basically, a java program may face two kinds of abnormal conditions. such as, Error and Exception.

        Exceptions are handled by java program whereas Errors can not be trapped.

        Error

§  NoSuchMethodError

§  NoClassDefFoundError

        Usually, we have two types of Exception.

        i) Checked Exception

                They are checked at compilation time.

        eg:

        IOException, ClassNotFoundException,         SQLException,UnKnownHostException.

        ii) Unchecked Exception

        They are checked at runtime.

        eg:- 

·       NumberFormatException

·       ArithmeticException

·       NullPointerException

·       ArrayIndexOutOfBoundsException

·       NegativeArraySizeException.etc.,