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Balaji B 10Balaji B 10 

Add values to a map,delete values from a map by using list?

Mahesh DMahesh D
Hi Balaji,

Please check the below example:
  
Map<String, String> colorCodes = new Map<String, String>();

colorCodes.put('Red', 'FF0000');
colorCodes.put('Blue', '0000A0');

String myColor = colorCodes.remove('Blue');
String code2 = colorCodes.get('Blue');

System.assertEquals(null, code2);

Here if you use the List to remove then
  
Map<String, String> colorCodes = new Map<String, String>();

colorCodes.put('Red', 'FF0000');
colorCodes.put('Blue', '0000A0');

List<String> colorCodeList = new List<String>();
colorCodeList.add('Blue');

for(String str: colorCodeList) {
      colorCodes.remove(str);
}

Also go through the below links to understand the Collections concept.

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_map.htm#apex_System_Map_remove

http://share-salesforce.blogspot.in/2013/05/sfdc-data-collections-listsetmap.html

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_collections.htm

Please do let me know if it hels you.

Regards,
Mahesh
Amit Chaudhary 8Amit Chaudhary 8
Please check below post for map method in salesforce
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_map.htm
2) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_collections_maps.htm


ADD:-

How to add List in Map in one go :-
  
List<Account> ls = [select Id,Name from Account];
Map<Id, Account> m = new Map<Id, Account>(ls);

PutAll 
Map<String, String> map1 = new Map<String, String>();
map1.put('Red','FF0000');
Map<String, String> map2 = new Map<String, String>();
map2.put('Blue','0000FF');
// Add map1 entries to map2
map2.putAll(map1);
System.assertEquals(2, map2.size());
List<Account> accts = new List<Account>();
accts.add(new Account(Name='Account1'));
accts.add(new Account(Name='Account2'));
// Insert accounts so their IDs are populated.
insert accts;
Map<Id, Account> m = new Map<Id, Account>();
// Add all the records to the map.
m.putAll(accts);
System.assertEquals(2, m.size());
REmove :- 
Map<String, String> colorCodes = new Map<String, String>();

colorCodes.put('Red', 'FF0000');
colorCodes.put('Blue', '0000A0');

String myColor = colorCodes.remove('Blue');
String code2 = colorCodes.get('Blue');

System.assertEquals(null, code2);
REmove list 
Map<String, String> colorCodes = new Map<String, String>();

colorCodes.put('Red', 'FF0000');
colorCodes.put('Blue', '0000A0');

List<String> colorCodeList = new List<String>();
colorCodeList.add('Blue');

for(String str: colorCodeList) 
{
      colorCodes.remove(str);
}
Let us know if this will help you

Thanks
Amit Chaudhary
ShivaKrishna(Freelancer)ShivaKrishna(Freelancer)
Hi Balaji,

above posts can helps you. if you are specific to any perticular complex requirement then throw that here. 

shiva.sfdc.backup@gmail.com
manu manu 23manu manu 23
you can add values through list(if the value is sobject), you have three ways
1.map<id,account> mp=new map<id,account>([select name from account limit 5]);
2. list<account> l=[select name from account limit 5];
map<id,account> mp1=new map<id,account>(ls); 
3. using putall(listofsobject);
map<id,account> mp2=new map<id,account>();
mp2.putAll(l); 

NOTE: all this three are possible only if the key is ID/string
Suraj Tripathi 47Suraj Tripathi 47
Hi Balaji,
To add list into Map-: 
List<Contact> ContactList = [SELECT Id,LastName FROM Contact LIMIT 1000];
Map<Id, Contact>conMap = new Map<Id, Contact>(ContactList);
For adding List into Map you can also use putAll()method.
For removing element from Map you can use remove()method.

If you find your Solution then mark this as the best answer. 

Thank you!

Regards 
Suraj Tripathi