#80 Exception throw keyword in Java

Published: 18 January 2023
on channel: Telusko

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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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