does continue work in a do while?

Question

I have a do while that looks like:

User user = userDao.Get(1);  do {  // processing    // get the next user  //  user = UserDao.GetNext(user.Id);   if(user == null)        continue;   // will this work????????????? } while ( user != null) 

If it does work, its going to go to the top of the do statement, and user is null so things are going to break?

Maybe I should rework the loop to a while statement?

Answer 1

The continue makes it jump to the evaluation at the botton so the program can evaluate if it has to continue with another iteration or exit. In this case it will exit.

This is the specification: http://java.sun.com/docs/books/jls/third_edition/html/statements.html#6045

Such language questions you can search it in the Java Language Specification: http://java.sun.com/docs/books/jls/

Answer 2

This really wouldn't be the best way to write this code. If user is null, you'll get a NullPointerException when you try and get user.id the next time around. A better way to do this would be:

User user = UserDao.Get(1); while(user != null) {   // do something with the user   user = UserDao.GetNext(user.id); }