WEBVTT

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in this video we are going to discuss

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built-in exceptions

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we know that exceptions in Java can be

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divided into two categories one is the

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building exceptions and other one is

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that user different exceptions so in

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this case we are concentrating only on

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the built in exceptions that is some

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exceptions which are predefined within

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this Java language can be used in our

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coding so some building exceptions are

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listed here so Java has some predefined

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exceptions and all exceptions are the

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subclass of the exception class so

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throwable is a class which is having the

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package that is Java dot Lang so Java

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dot length dot Tribble so it has got

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inherited to the two subclasses so one

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is the errors so it is having the class

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that is the Java dot length dot error in

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other words the exceptions so which is

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having the class that is a Java dot

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length dot exception under this Java dot

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length of error class were having

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multiple different subclasses so some of

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them are out of memory errors stack

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overflow error etc and this Java dot

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length dot exception is a superclass for

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multiple different subclasses

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so I exception SQL exception file not

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found exception class not found

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exception etcetera we're having this

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Java dot length at runtime exception who

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just have which is having some

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subclasses here

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arithmetic exception null pointer

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exception index out of bounds exception

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illegal argument exception and etc so

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this is a hierarchical diagram partial

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we have shown here now let us go for

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some built-in exceptions so arithmetic

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exception from the name it is quite

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obvious that when we'll be doing some

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arithmetic operations and if we find

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some exceptions are occurring then this

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exception will be thrown so arithmetic

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errors such as divide two by zero so

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array index out of bounds exception from

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the name it is quite obvious that I am

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trying to access some subscript or the

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location of an array which is beyond the

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definition so index exceeds the range of

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the array so in those cases this

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array index out of bounds exception will

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be thrown null pointer exception invalid

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use of null reference number format

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exception invalid conversion of a string

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to a numeric format so in those cases

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this number format exception may be

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thrown no such method exception we are

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going for another type of no such method

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exception a requested method does not

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exist so in this we are having different

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exceptions we are having the different

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descriptions so for the better and

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understanding let us go for one

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practical demonstration for the ease of

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your knowledge generation here in this

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Java program I have defined one integer

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array the name of the air is my array

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which is having five consecutive

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locations so five elements were put into

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this array and during initialization of

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this array we have also mentioned the

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size of the array that means it is

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having five consecutive locations as a

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subscript will be ranging from zero to

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four so if any subscript if we mention

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which is beyond this range then

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obviously one exception will be

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occurring so here you are printing the

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value of this array from the subscript

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number ten which is quite well a greater

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than the value for that is a maximum

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subscript possible for this array and

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for this situation one exception will be

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raised and that's why we have written

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our catch block just following the try

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block here and this cache block is

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handling array index out of bounds

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exception and is a respective object for

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that and here you are having the

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remedial actions that means we are

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printing one statement that is invalid

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index of the array okay now next time we

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will define one string object string

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class object that is a my string

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initialized with null and here in this

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particular system dot out dot println

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statement we are trying to print the

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character at the fifth location but this

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my string has got initialized with null

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so if I want to pick up the character

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from the fifth index of this particular

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my string string object obviously that

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will raise one exception

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so one exception

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produced and that's why this particular

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cord has been put within the cry block

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and immediately this code is following

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the catch block and that is a null

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pointer exception e so system dot out

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dot println the string is pointing to a

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null value so respective string

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respective message will get printed

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which is the error handling part okay

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now see here we are trying to convert

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this ABC this particular string as an

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indigent

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so now integer dot parts int ABC string

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which is not at all possible because ABC

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cannot be converted to a number so

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that's why int number well we are when

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trying to initialize this number that is

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a int variable it is not possible and

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that will raise one exception and that

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exception is known as the number format

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exception so what will happen this

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particular line will remain unreachable

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and executed whenever we were trying to

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do this I India dot parse int we're

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calling this particular method

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converting one string to number then

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immediately exception will be raised and

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the catch block will get the control

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here and here to here the exception name

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is number format exception and this

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remedial statement will be printed so

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now let us go for the execution you can

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find that whenever I am executing

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inverted index of the array that means

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this line has got executed that means

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the control came to this in array index

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out of bounds exception cache block the

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string is pointing a null value that

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means this line has got printed that

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means the control came to the cache

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block for this null pointer exception II

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and it is not a valid number that means

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control came to this catch block here so

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in this way you can find that how this

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inbuilt exceptions in Java we have

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handled so now if I put this one as 1 so

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0 to 4 is a valid index here because

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we're having 5 integers are there so

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that's why one index is valid so if I

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put here say 0 let us see that what will

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happen then obviously some exception

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will be there and here if we put here

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100 then 100 which is a string can

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easily be converted to a number so now

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see what will happen so the value of the

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of my array 10 so here it should write

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this one as

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I'm writing this one as one so now if I

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go for this so the value of my edit one

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is 20s at the index number zero index

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number one is containing twenty the

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string is pointing a null value that

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means here it is producing exceptions

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because the string has got initialized

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with a null but let us suppose I am just

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putting this one as ABCD so now see what

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will happen so it is it is picking up

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the respective character zero because

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I'm picking up the Spree character from

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the zero play so a will be picked up and

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accordingly outputs are coming and in

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the last case the number is 100 that

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means this line caught the control so

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cache block is not getting the control

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so in this way you have explained how

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this inbuilt exceptions can be handled

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in our Java code thanks for watching

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this video