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Developers comfortable with Array notation can also use it while using Lists. Array and List syntax can be used interchangeably. Array notation is a notation where a list’s elements are referenced by enclosing the index number in square brackets after the list’s name.

String[] nameList = new String[4];

//or

String[] nameList2 = new List<String>();

//or

List<String> nameList3 = new String[4];

// Set values for 0, 1, 2 indices

nameList[0] = ‘Bhavna’;

nameList[1] = ‘Bhavya’;

nameList[2] = ‘Swati’;

// Size of the list, which is always an integer value

Integer listSize = nameList.size();

// Accessing the 2nd element in the list, denoted by index 1

System.debug(nameList[1]); // ‘Bhavna’

Some common methods of list:

add(element)	It adds an element into the list. it always adds at the last.	List<String> l = new List<String>(); l.add(‘abc’); System.debug(l); // (‘abc’)
size()	Returns the number of elements in the list.	l.add(‘def’); System.debug(l.size()); // 2 System.debug(l); // (‘abc’,’def’)
get(index)	Returns the element on the ith index.	System.debug(l.get(0)); // ‘abc’
remove(index)	Removes the element on ith index.	l.remove(1); System.debug(l); // (‘abc’)
clone()	Makes a duplicate of a list.	List<String> l2 = l.clone();
set()	Sets the element on the ith position of the list. If there is already a value then value gets overridden.	l.add(‘def’); l.add(‘ghi’); System.debug(l);//(‘abc’,’def’,’ghi’) l.set(2,’aaa’); System.debug(l);//(‘abc’,’def’,’aaa’)
sort()	Sorts the item in ascending order but works with primitive datatypes only.	l.sort(); System.debug(l);//(’aaa’,‘abc’,’def’)
isEmpty()	Returns true if the list is empty.	System.debug(l.isEmpty()); // false
clear()	Clears the list.	l.clear()

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List Array Notation

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