INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: In Execption handling What is exactly difference between throws and throw?

Answer: Throw as well as Throws they sound similar but there is diff among them.Both of them are keywoeds used in JAVA and are related with exceptions.

THROW - this keyword is used to throw an exception explicitly.

-for eg consider we catch an Divide by zero exception in any method.If v wish to throw this exception to the method which called it then v will throw the exception obj to the method which called it.

THROWS-See this keyword provide us with an alternative to catch exception.

- v can catch exceptions through try{} catch{} too,but if v expect an exception

which we may not know then write this keyword in front of the method.If exceptn

occurs then it will b throwed to the calling method

Throw as well as Throws they sound similar but there is diff among them.Both of them are keywoeds used in JAVA and are related with exceptions.

THROW - this keyword is used to throw an exception explicitly.

-for eg consider we catch an Divide by zero exception in any method.If v wish to throw this exception to the method which called it then v will throw the exception obj to the method which called it.

THROWS-See this keyword provide us with an alternative to catch exception.

- v can catch exceptions through try{} catch{} too,but if v expect an exception

which we may not know then write this keyword in front of the method.If exceptn

occurs then it will b throwed to the calling method


Source: CoolInterview.com

Hi...
"throw": It is used when u want to throw an exception by the programmer explicitly.
"throws" It is used when u want to throw an exception by the programatically.Consider the following program to understand about "throw" ,"throws" and UserdefinedExceptions.

class UserException extends Exception
{String abc=null;
public UserException(String some)
{ abc=some;
System.out.println(abc);
}
}


public class Devarathnam{

public static void main(String[] args) throws UserException {
int balance =5000;
int withdrawal=13000;
if(balance>withdrawal)
{
System.out.println("enjoy with money");
}
else
{
throw new UserException("No money");
}
}
}


Source: CoolInterview.com

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