WEBVTT

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In this video we are going to
discuss built-in exceptions

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We know that exceptions in Java
can be divided into two categories

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One is the built-in exceptions, another one is the user-defined exceptions.
So in this case, we are concentrating only on the built-in exceptions

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that is some exceptions which are predefined within
this Java language can be used in our coding

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So some built-in exceptions are listed
here. So Java has some predefined exceptions

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defined exceptions and all exceptions
are the subclass of the exception class

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So, Thrable is a class which is
having the package that is Java

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. . . So, Java.Lang dot Throbble. So it
has got inherited to the two subclasses

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So one is the errors. So it is
having the class that is the Java

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. . . . . . . . . . . . . . . . . exceptions,
which is having the class that is a Java. length

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Under this Java. .Lang. class we are having multiple
different subclasses so some of them are out of memory

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error stack overflow error etc and this java langdot exception is a superclass for multiple different subclasses so i exception SQL
exception file not found exception class not found exception we having this Java Lankt runtime exception which is having some subclasses here

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arithmetic exception, null pointer exception, index
out of bounds exception, illegal argument exception

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and etc. So this is a hierarchical
diagram partial we have shown here

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Now, let us go for some built-in exceptions. So, arithmetic exception. From the
name, it is quite obvious that when you'll be doing some arithmetic operations

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and if you find some exceptions are
occurring, then this exception will be thrown

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So, arithmetic errors such as divide by
zero. So, array index out-of-bounds exception

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From the name, it is quite obvious that I'm trying
to access some subscript or the location of an array

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which is beyond the definition. So index exceeds the risk. range of the array.
So in those cases, this array index out of bounds exception will be thrown

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Null pointer exception invalid use of null reference Number format exception invalid conversion of a string to a numeric
format So in those cases this number format exception may be thrown no such method exception we are going for another

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type of no such method exception a
requested method does not exist so in this

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we are having different exceptions we
are having the different descriptions so

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for the better understanding let us go
for one practical demonstration for the

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ease of your knowledge generation here in this Java program
I have defined one integer array the name of the array is my

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array which is having five consecutive
locations so five elements we have put

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into this array and during initialization
of this array we have also mentioned

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the size of the array that means it is
having five consecutive locations and the

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subscript will be ranging from zero to four
so if any subscript if we mentioned which

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is beyond this range then obviously
one exception will be occurring so here

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here we are printing the value of this
array from the subscript number 10 which is

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quite well greater than the value 4 that
is a maximum subscript possible for this

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array and for this situation one exception
will be raised and that's why we've

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written a catch block just following the tri block here and this catch block is handling
array index out of bounds exception and is a respective object for that and here

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we are having the remedial actions that
means we are printing one statement

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that is invalid index of the array okay
now next time we will define one string

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object string class object that is a my
string initialized with null and here

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in this particular system dot outer print element statement we're trying
to print the character at the fifth location but this my string has got

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initialized with null so if I want to pick
up the character from the fifth index of

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this particular my string object obviously
that will raise one exception so one

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exception will be produced and that's why
this particular code has been put within

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the tri block and immediately this code is
following the catch block and that is a

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null pointed exception e so system dot outd
printer length the string is pointing to

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to a null value. So, respective string, respective
message will get printed, which is the error handling part

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Okay, now see, here we are trying to convert
this ABC, this particular string, as an integer

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So now integer.d. Parse, I.N, B, C string,
which is not at all possible because