List in Salesforce

List

1. It allows Duplicate values .
2. It maintains insertion order.
3. List maintains index based.
4. It allows multiple null values.

Syntax

List<Datatype> variable name = new List<Datatype>();

Examples

• List<integer> a = new List<integer>();
• List<Account> b = new List<Account>();
• List<integer> ages;  Ages = new List<integer>();
• List<integer> ages = new List<integer>(){20,30,50};

Methods available in List

1. add(Element);
2. add(index,Element);
3. addAll(list 1);
4. size();
5. set(index,Element);
6. remove(index);
7. clear();l
8. get(index);
9. isEmpty();
10. SORT();