What happens when return null?
Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies data has been returned, whereas returning null clearly indicates that nothing has been returned.
Which method return type returns a value in Apex?
Return type is mandatory for method and if method is not returning anything then you must mention void as the return type.
Can a list be null in Apex?
When the list is sorted, the first element is null because it has no value assigned. The second element and third element have values of 5 and 10.
How do you declare an empty list in Apex?
To declare a list, use the List keyword followed by the primitive data, sObject, nested list, map, or set type within <> characters. For example: // Create an empty list of String….For example:
- List myList = new List(); // Define a new list.
- myList.
- // of the list.
- Integer i = myList.
- myList.
- myList.
Is an empty List null Java?
An empty collection isn’t the same as null . An empty collection is actually a collection, but there aren’t any elements in it yet. null means no collection exists at all.
How to avoid null values in Apex code?
It is generally best to avoid null values in code so using null list references to indicate empty lists isn’t usually good approach. That is this code: List strings = new List (); for (String item : strings) {
Is it OK to check an empty list in apex?
This is a waste of CPU time, because (a) records will never be null, and (b) iterating over an empty list is acceptable. Therefore, none of the three checks you might use are rarely appropriate.
How to create a list of sobjects in apex?
Since it accepts a list of SObjects in the parameter, this method becomes more generic, then you can use for Accounts, Opportunities or any other list of SObjects you want. Try initializing Lists if they are null before you need to use them.
When to check if a list is null?
There are, however, times when you’ll need to check for a specific condition before using some lists. It helps if you experiment with the various types to get a feel for when you should be aware that a list may be null. In this case, selectedValues will either be null, or will not be empty.