#80 Exception throw keyword in Java

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In this lecture we are discussing throw keyword :
#1
-- throw keyword in Java is used to explicitly throw an exception.
When an exception is thrown using the throw keyword, the execution of the current method is stopped.
syntax-
throw new NullPointerException("Object is null");
e.g
public void divide(int a, int b) {
if (b == 0) {
throw new ArithmeticException("Cannot divide by zero");
}
int result = a / b;
System.out.println(result);
}
#2
-- throw keyword is used to throw exceptions, not to catch them. To catch exceptions, you need to use a try-catch block.
-- if you do not use try-catch then the control is passed, where the method is called.
-- when you want to pass message to an exception
then you should use the parametrized constructor instead non parameterized constructor
e.g
class Main{
public static void main(String []args){
int a=0;
try{
if(a==0)
throw new ArithmeticException("a should not be zero"); // throw new ArithmeticException() is non parametrized constructor
}
catch(ArithmeticException e){
System.out.println("Exception caught: "+e);
}
}
}
Output: Exception caught: java.lang.ArithmeticException: a should not be zero
class Main{
public static void main(String[] args){
int j=30;
int i=1;
try{
j=18/i;
//handle the exception using throw
if(j==0)
throw new ArithmeticException("i donot want to print 0"); //try to create an exception
}
catch(ArithmeticException e){//here catch is catching the exception
System.out.println("ArithmeticException caught");
System.out.println(e.getMessage()); //getMessage() method use to get the message
}
catch(Exception e){
System.out.println("Exception caught");
}
}
}
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[@SP-vq7tg]

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[@lukegleeson3970]

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[@vishwajithbarad]

at 4:02 the exception is caused by the 9th line and the throw exception command will not execute since it will directly jump to catch with the same ArithmeticException. instead you could have move lines 10 and 11 to 9 and 9 to 11. but you have cleared the concept.

[@sowmyaks8386]

Thankyou for the explanation sir. Following your java lectures.... enjoying it♥️🙂🙂♥️

[@ajayghode3602]

Thank you...after longtime I got to know the real use of throw keyword.
@4:54 if i's value 0 then output : it shows /zero.
and if i's value 20 then output: I don't want to print zero.

[@udara-me]

The best java course ever😍

[@workoutsidhu]

Sir Your video is very help full.
Thank You

[@praneshnanoskar6353]

Superb explanation 👍

[@allabout90minutes9]

Amazing explanation

[@sukanyaswaminathan9130]

hello sir,
on executing line 9 itself, error occurs and the execution enters the catch block rite ? Line number 10 won't be executed at all and hence the 'throw' code. Am i getting it rite ?

[@shindeprem228]

Yes you are right

[@Jonggungoo]

aren't u from telangana sir!

[@bengaming99]

That’s why the channel name is telusko which means (learn) in Telugu

[@sethupathys641]

Hey, what does the throws keyword do?

[@crofux]

Throws keyword indicates that there might be error in this block of code

[@maleeshasandakalum6213]

Thank you sir❤❤

[@MudrikaAgrawal-kx6zk]

I have one doubt, how ArithmeticException object becomes constructor?

[@shindeprem228]

Every time we create object using new className()
the constructor of that class is invoked depending on parameters we pass, he meant that

[@tahaalshimy8255]

God bless you

[@jawad_karim]

amazing !

[@oshadhaedirisinghe1455]

Thank you

[@syedadil7256]

There is an error in the if part it is if(i==0) but u placed if(j==0). As the denominator should be checked that is i

[@ananysharma9290]

Nope buddy, If you'll re-watch the video, he explained that he doesn't want the value of J to be zero( which comes as an output when 18 is divided by 20).
Since the above division operation is not an exception, catch block is not called, that's why we are using the keyword "Throw" to make this operation an exception and catched by catch block.
The code in the video is totally correct 🙂

[@syedadil7256]

@@ananysharma9290 ok dude tqs

[@marioponticiello297]

don pollo