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Abilash.SAbilash.S 

How to get all keys in Map

Q) Map<String,String> strMap = new Map<String,String>();
strMap.put('vehicle','car');
strMap.put('vehicle2','bike');  How to get all keys?
ANUTEJANUTEJ (Salesforce Developers) 
Hi Pavushetti,

>> https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_map.htm

As mentioned in the above documentation link there are certain methods you can perform on map class one such method is keySet() you can check this out in the above link.
  
Map<String, String> colorCodes = new Map<String, String>();
 
colorCodes.put('Red', 'FF0000');
colorCodes.put('Blue', '0000A0');
 
Set <String> colorSet = new Set<String>();
colorSet = colorCodes.keySet();

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Salesforce Support.