Generally JVM throws the exception and we handle the exceptions by using try catch block. But there are
situations where we have to throw userdefined exceptions or runtime exceptions. In such case we use
throw keyword to throw exception explicitly.
Syntax : throw throwableInstance;
Throwable instance must be of type throwable or any of its subclasses.
After the throw statement execution stops and subsequent statements are not executed. Once exception
object is thrown JVM checks is there any catch block to handle the exception. If not then the next catch
statement till it finds the appropriate handler. If appropriate handler is not found ,then default exception
handler halts the program and prints the description and location of exception.
In general we use throw keyword for throwing userdefined or customized exception