Master the concepts of Salesforce in just 45 days Click here to know more.

8

DAYS :

10

HOURS :

58

MINS :

27

SECONDS
vote

Initialisation of Map:

Map<Integer, String> m = new Map<Integer, String>{5=>’Kalpana’};

m.put(1, ‘Bhavna’);

m.put(2, ‘Sapna’);

m.put(3, ‘Divya’);

m.put(4, ‘Bhavya’);

m.put(2, ‘Divya’); // this will override previous value

Map of List:

Map<Integer, List<Integer>> m = new Map<Integer, List<Integer>>();

m.put(1, new List());

Methods of Map:

put(key,value) Associates the specified value with the specified key in the map. Map<Integer,String> m = new
Map<Integer,String>();
m.put(1, ‘Bhavna’);m.put(2, ’Sapna’);
System.debug(s);//(1=‘Bhavna’,2=’Sapna’)
putAll(map) Copies all of the mappings from the specified map to the original map. Map<Integer,String> n = new
Map<Integer,String>();
n.put(3, ’Bhavya’);
n.put(4, ‘Divya’);
m.putAll(n);
System.debug(m);// (1=‘Bhavna’,2=’Sapna’
3=’Bhavya’,4=’Divya’)
get(key) Returns the value to which the specified key is mapped, or null if the map contains no value for this key. System.debug(m.get(1)); // ‘Bhavna’
System.debug(m.get(2)); // ’Sapna’
System.debug(m.get(3)); // ’Bhavya’
System.debug(m.get(4)); // ’Divya’
values() Returns a list that contains all the values in the map. List<String> l = new List<String>();
l = m.values();
System.debug(l);// (‘Bhavna’,’Sapna’,’Bhavya’,’Divya’)
clone() Makes a duplicate copy of the map. Map<Integer,String> o = new
Map<Integer,String>();
o = m.clone();
System.debug(o);// (1=‘Bhavna’,2=’Sapna’
3=’Bhavya’,4=’Divya’)
keySet() Returns a set that contains all of the keys in the map. System.debug(m.keySet());
// (1,2,3,4)
containsKey(key) Returns true if the map contains a mapping for the specified key. Boolean result1 = m.containsKey(3);
System.debug(result1); // true
Boolean result2 = m.containsKey(6);
System.debug(result2); // false
isEmpty() Returns true if map has 0 key. Boolean result = m.isEmpty();
System.debug(result); // false
size() Returns the number of key-value pairs in the map. System.debug(m.size()); // 4
remove(key) Removes the mapping for the specified key from the map, if present, and returns the corresponding value. m.remove(4);
System.debug(m);//(1=‘Bhavna’,2=’Sapna’3=’Bhavya’)
clear() Removes all of the key-value mappings from the map. m.clear();

Note: Maps are used frequently to store records that you want to process or as containers for lookup data. It is very common to query for records and store them in a map so that you can do something with them.

Cyntexa CTA

Our Recent Blog

Key Roles & Responsibilities Of A Salesforce Administrator

Key Roles & Responsibilities Of A Salesforce Administrator

19 Apr, 2022
Choosing a career as a Salesforce Administrator can be the best you can have because it will have a growing impact on the business.
Read More
How To Pass The Salesforce Developer Certification Exam?

How To Pass The Salesforce Developer Certification Exam?

17 Mar, 2022
Easy ways to crack salesforce developer program like learn basic coding, know prerequisites for salesforce developer certification, start practical exercises with trailhead.
Read More
Is Salesforce a Good Career?

Is Salesforce a Good Career?

01 Mar, 2022
Salesforce Developer Careers are on trending jobs across the globe. Start your career in Salesforce by taking Salesforce Developer Course, Admin Course.
Read More
Salesforce Career Choices In 2022 With Learning Path & Pay Scale

Salesforce Career Choices In 2022 With Learning Path & Pay Scale

27 Jan, 2022
There's no denying that the Salesforce economy is thriving right now. IDC predicts that 4.2 million jobs are being created...
Read More
The 2022 Salary Guide for Salesforce Developers

The 2022 Salary Guide for Salesforce Developers

25 Jan, 2022
Whenever a modern consumer needs more than simply a high-quality product or service, generating leads and converting them into loyal...
Read More
How To Pass The Salesforce Admin Certification Exam?

How To Pass The Salesforce Admin Certification Exam?

17 Jan, 2022
Salesforce is a critical component of the day-to-day operations of many businesses. The good news for Salesforce Admins is that...
Read More
Salary Guide Of Salesforce Consultant In 2022

Salary Guide Of Salesforce Consultant In 2022

13 Jan, 2022
Introduction: Before delving into the Consultancy part, let us understand what Salesforce is. Salesforce is the #1 CRM platform with...
Read More

Can I get a job by just learning Salesforce Admin?

30 Nov, 2021
In the 29th episode of the #AsktheHulk series Akarsh raised the question “Is there any opportunities for the Salesforce Admin?”
Read More
How the Salesforce Job Market is Growing

How the Salesforce Job Market is Growing

25 Nov, 2021
Introduction: Salesforce is considered to be the world’s most popular CRM platform while having at least a 20% market share,...
Read More
7 Best Salesforce Certifications In 2021

7 Best Salesforce Certifications In 2021

23 Nov, 2021
Introduction: Before moving towards the Best Salesforce Certification topic, let’s first understand about Salesforce, for those who are still unaware...
Read More
Share This Post
×