Lists Initialization in APEX
Chapter Topics
- Apex Data Types
- Integer Data Type in APEX
- Floating Point Data Type in APEX
- String Data Type in APEX
- Date Datatypes in APEX
- Time and DateTime Data Types in APEX
- Boolean Datatype in Salesforce
- ID & Blob Datatypes in APEX
- What is the Rule of Conversions in Apex?
- Enums in APEX
- sObjects in Salesforce
- Generic sObjects in Salesforce
- Collections in APEX
- Lists in APEX
- List Array Notation in APEX
- Lists Initialization in APEX
- Nested Lists in APEX
- Sets in APEX
- Sets Initialization And Methods
- Maps in APEX
- Map Initialization Methods in APEX
- Operators in Apex and Their Types Guide
- Shorthand Operator
- Equality Operator
- Relational Operators(<,>,<=,>=)
Lists in Apex are dynamic arrays that can grow or shrink. They are used to store collections of elements, making them very useful for handling multiple values. Lists in Apex are ordered and have index-based collections that let you create duplicate elements. These are Zero-indexed, which means the first element is at 0 index.
Understanding how to initialize lists in Apex is fundamental for developers working on the Salesforce platform.
Syntax of List Initialization
The syntax for initializing a list in Apex involves specifying the type of the list and creating a new instance of it. Here is the basic syntax:
List listName = new List();
Example of List Initialization
Here is an example demonstrating how to initialize a list in Apex:
- Initializing a list of integers
List integerList = new List();
- Initializing a list of strings
List stringList = new List();
- Initializing a list of custom objects
List customObjectList = new List();
How to Initialize List in Apex?
There are several ways to initialize a list in Apex:
Using the New Keyword
This is the most common method to initialize a list.
List names = new List(); names.add('John'); names.add('Jane');
Using List Literals
This method allows you to initialize and populate the list at the same time.
List fruits = new List{'Apple', 'Banana', 'Cherry'};
Using Another List
You can initialize a list using another list.
List originalList = new List{'One', 'Two'};List newList = new List(originalList);
Using the `addAll` Method
You can also use the `addAll` method to initialize a list with the values from another list.
List firstList = new List{'Red', 'Blue'};List secondList = new List();secondList.addAll(firstList);
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