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empty() | clone() | clear() | tostring() | system.debug | boolean @ +919662460161
#Salesforce #ApexProgram #SetListMap by Swapna @Swapna Salesforce
(Set, List, Map, add(), size(), remove(), empty(),clone(), clear(), tostring(), system.debug, boolean,)

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Notes
Collection Data Type :
getSOBjectType():
Returns the token of the sObjectType
SOQL : SELECT Id From Account Limit 1
SObject sobj= Database.query('Select Id From Account Limit 1');
sobj.getSOBjectType();
Set : A set is unordered collection of primitive or sobject(
standard Object or custom Object) which does not contains a duplicate data
set Properties :
1) "set" contains key word "set"
2) "set" can't hold duplicates
3) "set" re-arranages the data by increaing order
4) "set" does not have index.
in realtime, set is mostly used for storing "Ids", string values, unqique key data
Set , list :
List :
1) ordered collection of data
2) List contains duplicates
3) List has index
4) sorting is done manually
set:
1) unordered collection of data
2) set does not contain duplicates
3) does not have index
4) sorting is auto applied
List.Account. acc = new List.Account.();
List.sObject. sobj;
system.debug(sobj.getSOBjectType());
//Set :
Set.String. cities = new Set.string..'Hyd','Chn','Blr','Hyd','Del','hyd','ka','HYD'.;
system.debug(cities);

//add()
cities.add('KA');
system.debug(cities);

//size()
integer csize=cities.size();
system.debug(csize);

//Remove()
cities.Remove('Hyd');
system.debug(cities);

//isEmpty()
system.debug(cities.isEmpty());

//clone()
set.string. cities2;
cities2=cities.clone();
system.debug('clone output--.'+cities2);

//clear()
cities2.clear();
system.debug('clear output--.'+cities2);

//toString()
/*string ct;
ct=cities.toString();
system.debug(ct);*/

Boolean result =cities.contains('Chn');
system.debug(result);

Map:
Map is collection of Key, value pair where each unique key match with single value.
.key,value.

Properties:
1) Complex data type
2) ca't hold the single value , it always holds the pair (key,value)
3) Key has to be unique, no duplicate in key
4) value can be duplicate

Ex: State ---. Capital
country ---. PM
// Map:
Map.String,String. STCP= new Map.String,String..'TS'=.'Hyd','KA'=.'BLR','KR'=.'TCV'.;
Map.Integer,String. CRKRnk = new Map.Integer,String..1=.'Sachin',2=.'Dhoni',3=.'Sunil'.;

//Set : set.Integer.
//List : List.String.
Map.set.Integer.,List.String.. newMap= new Map.set.Integer., List.String..();
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Assignement:
1) Implement Set collect data for Country.
a) print the output : whether 'US' country is available in set or not
b) add the new country to the existing set
c) add multiple countries (3) to the existing set
d) get the size of set
e) check whether set has a values or not
f) create another set which is copy of existing one and then clear the data in new set
g) get the specific country details
h) convert set to string
i) convert set to list
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Interview Question :
01.What is a List Collection Data Type ?
02.What is a Set Collection Data Type ?
03.What is the difference between Set and List Collection Data type ?
04.What is Map Collection Data Type ?
05.What is getSOBjectType Method ?
06.Explain Set?
07.Explain Set Properties?
08.Where do we use set in realtime?
09.Explain List?
10.Explain add()?
11.Explain size()?
12.Explain remove()?
13.Explain is Empty()?
14.Explain Clone()?
15.Explain Clear()?
16.Explain toString()?
17.What is Boolean?
18.What is System.debug()?
19.Explain Map()?
20.Explain Map Properties?
21.How to convert Set to String?
22.How to convert Set to List?
23.How to add multiple values to existing set?
24.How to create copy of a set with existing set?
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Trailhead Practice
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