Identify component type from ID

You can use Id.getSObjectType() to know what type an Id is.

Id someId = ...;
System.debug(someId.getSObjectType());

You can refer to it literally:

if(someId.getSobjectType() == ApexClass.sObjectType) {
    // is a apex class

Or you check as a string:

if(String.someValueOf(someId.getSObjectType()) == 'ApexClass') {
    // is an apex class

You can get to know it from the first three digit key prefix whether its a Apex Class, VF Page or Trigger

Apex Class - 01p
VF Page - 066
Apex Trigger - 01q

There is a better way to do this such that it is dynamic i.e. works for any component and is reusable. The reusable apex method is available as an official salesforce knowledge article -- How to find Object Type from Record ID Prefix

Also, it is highly recommended to go through the apex doc for the following methods and understand their return types:

  • Schema.getGlobalDescribe
  • SObjectType.getDescribe()
  • Schema.DescribeSObjectResult.getKeyPrefix()
  • Schema.DescribeSObjectResult.getName()

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