Map in Salesforce

Map

1. It is key value pair.
2. Key must be primitive data type and value may be primitive data types/Reference data type.
3. Primitive data type are integer,decimal,string,id,Boolean,data…
4. Only one key value is allowed to be null.

Syntax

Map<key,value> variablename = new map<key,value>();

• Data is storing according to keys dictionary order.
• keys are case sensitive

Methods

1. Put(key,value);
2. Set<key> keyset(); used to read all keys.
3. Remove(key);
4. Size();

Example

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

m.put(‘salesforce’, 200);

 m.put(‘codes’ 300);

system.debug(‘map values’ +m);