What does the Error List Index out of bounds mean?

What does the Error List Index out of bounds mean?

System.ListException: List index out of bounds: 0 is an error that occurs if you are trying to access an array that does not have any elements in it or an element does not exist for the index that is being accessed. System.ListException: List index out of bounds Example

What is an example of system.listexception?

Have you ever encountered System.ListException: List index out of bounds 0 or 1or 2 .. error? Let us understand by an example. Imagine Trigger.New has only 1 record and so ops list has only 1 record. When creating a contact, if i try to access c.FirstName=”+ ops [1] .Account.Name , i am trying to access an index that’s not in the List.

Why is the List Index out of bounds in apex?

con [] has no elements so trying to access the 0 index element will cause the list index out of bounds excpetion. You may want to add in an else condition to handle the case where there is no 0th element as well which you could do in an else clause:

Why does tempin throw an index out of bounds?

On the next line your where id=:tempInvoiceid evaluates to where id = null which results in an empty (i.e., size 0) List being assigned to tempin. This causes the next line tempin [0] to throw a List Index Out of Bounds error, because there is no 0th element in an empty List.

What does the number at the end of system.listexception mean?

The number at the end of the error will represent the index being accessed that caused the error to be thrown. There are two ways you can avoid the System.ListException error from occurring.

How to avoid the system.listexception error?

There are two ways you can avoid the System.ListException error from occurring. For example, to avoid hitting the System.ListException you can wrap your code around if statements to ensure the array has the necessary number of elements before attempting to access an index.