What is an ordered list?
A list is an ordered collection of elements that are distinguished by their indices. List elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. This table is a visual representation of a list of Strings:
How do I declare a list in Salesforce?
To declare a list, use the List keyword followed by the primitive data, sObject, nested list, map, or set type within <> characters. For example: To access elements in a list, use the List methods provided by Apex. For example: For more information, including a complete list of all supported methods, see List Class.
How to create a list in Salesforce apex?
A list can contain up to four levels of nested collections inside it, that is, a total of five levels overall. To declare a list, use the List keyword followed by the primitive data, sObject, nested list, map, or set type within <> characters. For example: To access elements in a list, use the List methods provided by Apex.
How do I implement a custom sort order for sobjects in lists?
To implement a custom sort order for sObjects in lists, create a wrapper class for the sObject and implement the Comparable interface. The wrapper class contains the sObject in question and implements the compareTo method, in which you specify the sort logic. This example shows how to create a wrapper class for Opportunity.
What is ordered and unordered list in Salesforce?
An ordered collection means that the elements of the collection have a specific order. The order is independent of the value. A List is an example. A sorted/unordered collection means that not only does the collection have order, but the order depends on the value of the element.
Can we sort a list in Salesforce?
You can sort list elements and the sort order depends on the data type of the elements. Using the List. sort method, you can sort elements in a list.
What does it mean list is ordered?
Ordered Lists: These are sometimes called numbered lists because, by default, the list items contained in that list have a specific numerical order or ranking. Ordered lists are appropriate where the exact ordering of items are important to the meaning of the content.
What is a list in Salesforce?
A list is like an array, a sequential collection of elements with first index position as zero. List can contain elements of primitive types, sObjects, user-defined objects, Apex objects or even other collections. A list can contain up to four levels of nested collections. List can contain duplicate elements.
Is list ordered Apex?
A list is an ordered collection of elements that are distinguished by their indices. List elements can be of any datatype - primitive types, collections, Sobjects, user-defined types and built-in apex type. As I have mentioned before List is ordered the collection of elements.
How do I reorder list views in Salesforce?
To accomplish this:Go to: In Salesforce Classic: Your Name | Setup | Customize | Object | Fields. ... Click the name of the desired picklist field.Click the Reorder button and select the Display values alphabetically, not in the order entered checkbox.
Is list collection ordered?
A List is an ordered Collection (sometimes called a sequence). Lists may contain duplicate elements. In addition to the operations inherited from Collection , the List interface includes operations for the following: Positional access — manipulates elements based on their numerical position in the list.
What are the 4 types of list?
Different Types of Lists in HTMLUnordered Lists or Bullet Lists: An unordered list is formed with the element UL and contains at least one list element LI. ... Ordered Lists: This list is used to create and Indexed List, such as a numbered or alphabetical list. ... Nested List: ... Definition Lists:
What is difference between ordered and unordered list?
Unordered list — Used to create a list of related items, in no particular order. Ordered list — Used to create a list of related items, in a specific order. Description list — Used to create a list of terms and their descriptions.
What is the difference between list and set in Salesforce?
A List is an ordered collection of elements that are distinguished by their indices. List elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. Whereas, Set is an unordered collection of elements that do not contain any duplicates.
What are the methods of list in Salesforce?
List Methodsadd(listElement) Adds an element to the end of the list.add(index, listElement) Inserts an element into the list at the specified index position.addAll(fromList) ... addAll(fromSet) ... clear() ... clone() ... contains(listElement) ... deepClone(preserveId, preserveReadonlyTimestamps, preserveAutonumber)More items...
What is list collection in Salesforce?
A list is an ordered collection of any data type such as primitive types, collections, sObjects, user-defined types, and built-in Apex types. The following are the key features of a list collection in Salesforce: Duplicates and nulls are allowed in a list collection. “List” is the keyword to declare a list collection.
How to implement a custom sort order for sObjects in a list?
To implement a custom sort order for sObjects in lists, create a wrapper class for the sObject and implement the Comparable interface. The wrapper class contains the sObject in question and implements the compareTo method, in which you specify the sort logic.
How does List.sort work?
The List.sort method sorts sObjects in ascending order and compares sObjects using an ordered sequence of steps that specify the labels or fields used. The comparison starts with the first step in the sequence and ends when two sObjects are sorted using specified labels or fields. The following is the comparison sequence used:
What are standard fields?
Standard fields, starting with the fields that come first in alphabetical order, except for the Id and Name fields. For example, if two accounts have the same name, the first standard field used for sorting is AccountNumber. Custom fields, starting with the fields that come first in alphabetical order. For example, suppose two accounts have the ...
