Question

I was told to use zerolength arrays instead of nulls in the program.But I couldn’t find how to use Zerolength array.Please Help me.

Answer 1

The idea, in general, is that if a query returns “no results”, all things being equal, it is better to return an empty list (or array) than null.

The reason for that is it makes the client code a lot cleaner. You can still do something like this with an empty array:

Account[] accounts = getAccounts();
for ( Account account : accounts ) {
    account.recomputeForInterest();
}

If you tried the same with null you would get a runtime exception. You can create an empty array using a few methods:

Account[] accounts = {};
accounts = new Account[0];
accounts = new Account[]{};