Salesforce Collections

HI Salesforce Developers ,

Developer Console

list<college> lststudent=new list<college>();

College shadan=new college();

shadan.strStudentName='susan';

Shadan.iStudentAge=20;

lststudent.add(shadan);

Retrieving values from list

for(college obj:lststudent)

{

system.debug(obj.strStudentName);

system.debug(obj.istudentage);

}

Sets

set<college> setCollege=new set<college>();

creating an object

college biet=new college();

Inserting elements into set

biet.strStudentName='Jasmine';

biet.strStudentName='Jasmine';

biet.istudentage=24;

adding object to the set instance

setcollege.add(biet);

Retrieving elements from set

for(college obj:setcollege)

{system.debug(obj.strStudentName);

system.debug(obj.istudentage);

}

Maps

map<string,string> mapname=new map<string,string>();

   mapname.put('anitha','Sfdc');

   mapname.get('anitha');

DML Operations

Inserting values into Accounts Object

list<account> a1=new list<account>();

a1.add(new account(name='Preethi'));

insert a1;

15/10/14

Lists

list<string> lststring=new list<string>();    // creating an empty list of string

lststring.add('philomenal');                        //adding element philomenal to the list

string str =lststring.get(0);                        //Retrieves the element at index 0

system.debug(lststring.get(0));                //printing the retrieved element

Inserting and retrieving multiple elements from List

list<integer> lstinteger=new list<integer>();

lstinteger.add(1000);

lstinteger.add(2000);

integer isalary =lstinteger.get(0);

isalary =lstinteger.get(1);

system.debug(lstinteger.get(0));

system.debug(lstinteger.get(1));

Sorting in Order

List<string> colors=new list<string>{'green','pink','red'};

   colors.sort();

system.assertEquals('green', colors.get(0));

system.assertequals('pink',colors.get(1));

system.debug(colors.get(0));

system.debug(colors.get(1));

add(integer,object) method

list<integer> lstinteger=new integer[3];

lstinteger.add(0,1000);

lstinteger.add(1,2000);

lstinteger.add(3,3000);

system.assertEquals(lstinteger.get(3), 3000);

system.debug(lstinteger.get(3));

Coping one List elements into another list using addall()

List<Account>lsta1= new list<Account>([select name,id from account where name='hitachi']);

List<Account>lsta2=new list<Account>([select name,id from account where billingcity='hyd']);

List<Account>lstMasterAcc= new List<Account>();

lstMasterAcc.addall(lsta1);

//System.debug(MasterAcc.get(lsta1));

lstMasterAcc.addall(lsta2);

//system.debug(MasterAcc.get(lsta2));

for(Account Accobj:lstMasterAcc)

{system.debug(lstMasterAcc.get(0));}

Coping  List elements into set using addall(set)

List<Account>lstacc=new list<Account>([select name,id from account where billingcity='hyd']);

set<account> setacc=new set<account>([select id,name from account where name='abcd']);

List<account> lstMasteracc=new List<account>();

lstmasteracc.addall(setacc);

lstmasteracc.addall(lstacc);

for(account objacc:lstmasteracc)

{

   system.debug(lstmasteracc.get(0));

}

Inserted account records into list elements

List<account> LstAcc=new list<account>([select name,id from account where billingcity='hyd']);

for(account obj:lstacc){

system.debug(lstacc.get(0));

}

Clearing the inserted elements from List

List<account> LstAcc=new list<account>([select name,id from account where billingcity='hyd']);

//for(account obj:lstacc){

lstacc.clear();

//}

Clone()

List<account> lstacc=new list<account>([select name,id from account where billingcity='hyd']);

List<Account> lstAccClone= lstacc.clone();

system.debug('cloned account is '+lstacc);

Equals(list)

List<account> lstacc=new list<account>([select name,id,createddate from account where billingcity='hyd']);

List<Account> lstAccClone= lstacc.clone();

system.debug('cloned account is '+lstacc);

lstacc.equals(lstAccClone);

system.debug('lstacc equals lstaccclone '+lstacc.equals(lstAccClone));

Debug:18:43:50:248 USER_DEBUG [6]|DEBUG|lstacc equals lstaccclone true

Equals(list) for deep clone

List<account> lstacc=new list<account>([select name,id,createddate from account where billingcity='hyd']);

List<Account> lstAccClone= lstacc.deepclone(true,false,true);

system.debug('cloned account is '+lstacc);

lstacc.equals(lstAccClone);

system.debug('lstacc equals lstaccclone '+lstacc.equals(lstAccClone));

Debug:18:42:52:074 USER_DEBUG [5]|DEBUG|lstacc equals lstaccclone false

Get(integer)

list<integer> lstinteger=new list<integer>();

lstinteger.add(1000);

lstinteger.add(2000);

integer isalary =lstinteger.get(0);

isalary =lstinteger.get(1);

system.debug(lstinteger.get(0));

system.debug(lstinteger.get(1));

HashCode()

list<integer> lstinteger=new integer[3];

lstinteger.add(0,1000);

lstinteger.add(1,2000);

lstinteger.add(3,3000);

//system.assertEquals(lstinteger.get(3), 3000);

//system.debug(lstinteger.get(3));

lstinteger.hashcode();

system.debug(lstinteger.hashcode());

Debug:   18:50:56:050 USER_DEBUG [8]|DEBUG|1301808609

IsEmpty()

list<integer> lstinteger=new integer[3];

lstinteger.add(0,1000);

lstinteger.add(1,2000);

lstinteger.add(3,3000);

system.debug(lstinteger.isempty());

Debug: 18:53:31:034 USER_DEBUG [5]|DEBUG|false

list<integer> lstinteger=new integer[3];

//lstinteger.add(0,1000);

//lstinteger.add(1,2000);

//lstinteger.add(3,3000);

lstinteger.clear();

system.debug(lstinteger.isempty());

Debug : 18:55:42:034 USER_DEBUG [7]|DEBUG|true

Remove(integer)

list<integer> lstinteger=new integer[5];

//lstinteger.clear();

lstinteger.add(0,1000);

lstinteger.add(1,2000);

lstinteger.add(2,3000);

integer iremoveinteger=lstinteger.remove(0);

  // for(integer iobj:lstinteger)

//{

   system.debug('Contents of the list'+lstinteger);

Debug: 19:07:15:047 USER_DEBUG [10]|DEBUG|Contents of the list(2000, 3000, null, null, null, null, null)

Updating account record (try catch exception)

list<account> a=new list<account>();

a=[select id,billingcity,accountnumber from account where id='00190000014Vftk'];

a.add(new account(billingcity='hyd'));

a.add(new account(accountnumber=12345));

try{

   update a;

}

catch(exception e)

{//system.debug(dml exception);

   }

Maps

map<string,string> m=new map<string,string>();

m.put('ani','sfdc');

m.put('sonu','.net');

m.put('manu','mobile');

//System.debug(m.get('sonu'));      //prints keys(sonu) corresponding value(.net)

set<string> s=m.keyset();               

System.debug(m.keyset());           //Prints all elements

Map<ID,Contact> mapAcc=new Map<id,contact>([select id,name from contact ]);

system.debug(mapacc.values()); // prints values of contact

Map<ID,Contact> mapAcc=new Map<id,contact>([select id,name from contact ]);

system.debug(mapacc.keyset()); //prints keys of contact

Map<ID,Contact> mapAcc=new Map<id,contact>([select id,name from contact ]);

system.debug(mapacc.size()); //gives the size of contacts

copy list elements into map

list<account> lstacc=new list<account>([select id,name from account where billingstate='ts']);

map<id,account> maplst=new map<id,account>(lstacc);

system.debug(lstacc);

ContainsKey()

Map<ID,account> mapAcc=new Map<id,account>([select id,name,billingcity from account ]);

system.debug(mapacc.containskey('00190000016L7jx'));