Core Java - difference between throw and throws

GeekInterview.com > Interview Questions > J2EE > Core Java

Go To First | Previous Question | Next Question

Core Java | Question 482 of 502

difference between throw and throws

What exactly is the difference between between throw and throws? If both are used for the same purpose then why are both needed instead of one?

Total Answers and Comments: 2

Last Update: June 30, 2008 Asked by: Kartheek11

Sponsored Links

Best Rated Answer

—

Submitted by: krishna_kanth83

they are not same.

"throws" declares that your method is capable of throwing an exception.

"throw" actually does the work , of throwing the exception.

example :

public void doSomething() throws ApplicationException
{
    try{
        }
    catch(Exception e){
            // catch all excpetions n provide some meaningful message
            throw ApplicationException("An error occurred while trying connect to DB");
        }
}

Above answer was rated as good by the following members:
interviewprep9, dhivyaid, r.praveenkumar, dabir, Naveenjavasun, timmireddy, pravinsharma, tanzeem khan, sushilkotnala, sonalgauravmahajan, bino75

June 14, 2008 11:04:08

krishna_kanth83

Member Since: May 2008 Contribution: 3

RE: difference between throw and throws

they are not same.

"throws" declares that your method is capable of throwing an exception.

"throw" actually does the work of throwing the exception.

example :

public void doSomething() throws ApplicationException
{
try{
}
catch(Exception e){
// catch all excpetions n provide some meaningful message
throw ApplicationException("An error occurred while trying connect to DB");
}
}

Is this answer useful? Yes | No

6 1

Overall Rating: +5

June 15, 2008 08:31:11

vegetto

Member Since: June 2008 Contribution: 10

RE: difference between throw and throws

hi there

throw:the throw keyword is used to throw the exception manually that is when you feel a particular line in your code when executed is capable of having some exception then you use throw keyword as:

throw new MyException(arguments if any);
this leads to instantiating of the MyException class and exception is thrown

throws: this is to be used when you are not using the try catch statement in your code but you know that this particular class is capable of throwing so and so exception(only checked exceptions).in this you do not use try catch block but write using the throw clause at appropriate point in you code and the exception is thrown to caller of the method and is handeled by it. eg:

void trouble()throws IOException any other exceptions just separate them with commas.......
{
/* throw statement at appropriate step
no need to use try catch here exception would be thrown to caller and u should provide try catch block to handle exception there else this process cotinues further till
appropriately it is handeled or prog terminates abruptly */
}

this is called as HANDLE OR DECLARE RULE i.e either u handle exceptions using try catch block or by declaring them

Is this answer useful? Yes | No

9 0

Overall Rating: +9

Service Oriented Java Business Integration Review

Service Oriented Java Business Integration Review Introduction If you ve read through the texts which give you an introduction to SOA or Web Services you will often find them to be quite frustrating and the reason for this is because they spend too much time referencing business processes which are

Java and Client Server Models

Java and Client Server Models The Role of Client Servers on the Web Client server models provide the essential mechanisms for working with the Internet In fact most of the World Wide Web is built according to this paradigm In client server models the web browsers run by millions of users are the cli

What is difference between call by value and call by reference in function?

The arguments passed to function can be of two types 1. Values passed 2. Address passed The first type refers to call by value and the second type refers to call by reference. For instance consider program1 main() { int x=50, y=70; interchange(x,y); printf(“x=%d y=%d”,x,

The Interview Snafu

How to turn someone else’s mistake to your advantage Your dream job is about to become reality. A recruiter gave you the heads up about the perfect position at Humungous Conglomerate, Inc. You went through five interviews as well as a battery of psychological tests mandated by their HR de

Winning a Job Interview with a Winning Resume

Does your resume unlock your potential, take your skills to the highest level and win you the interview and the job you want now? The job market today is highly competitive and even if you think you have what it takes to get an interview you won’t get over the line without a polished, prof

Using UML with Java

Using UML with Java While Java is not a new language its application for the development of embedded systems is quite new Developers are beginning to take a second look at modeling languages such as UML and many feel it can be a powerful tool in their development arsenal mosgoogle center Introductio

Importance of Proper English during Job Interview

Importance of Proper English during Job Interview Your job interview is crucially important and it will determine whether or not you will get the job Depending on the type of job you re going for it is very important for you to use proper English In most cases jobs which offer higher salaries will h

Java Technology Trends

Technology Trends Involving Java Java is an object oriented programming language OOP for Web browsers It is organized around data rather than actions and supports polymorphism which allows the same code to be written generically so it can function with different datatypes inheritance which allows on

Difference between Scholarship and Grant

Difference between Scholarship and Grant While both scholarships and grants allow students to pay for their tuition without having to pay the money back there are a number of key differences between the two Knowing the difference between grants and scholarship will make it much easier for students t

HR Interview - HR Interview Mistakes You Will Want To Avoid

HR Interview Mistakes You Will Want To Avoid The job interview can be a stressful process This is especially true for those who are going after a competitive position Your nonverbal communication combined with the answers you give during the interview will determine if you are hired mosgoogle While

Related Categories

—

User Name		Remember Me?
Password

Question Bank