Apex Developer Guide
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Sets of Objects
Sets can contain sObjects among other types of elements.
Sets contain unique elements. Uniqueness of sObjects is determined
by comparing the objects’ fields. For example, if you try to
add two accounts with the same name to a set, with no other fields
set, only one sObject is added to the set.
// Create two accounts, a1 and a2
Account a1 = new account(name='MyAccount');
Account a2 = new account(name='MyAccount');
// Add both accounts to the new set
Set<Account> accountSet = new Set<Account>{a1, a2};
// Verify that the set only contains one item
System.assertEquals(accountSet.size(), 1);If you add a description to one of the accounts, it is considered
unique and both accounts are added to the set.
// Create two accounts, a1 and a2, and add a description to a2
Account a1 = new account(name='MyAccount');
Account a2 = new account(name='MyAccount', description='My test account');
// Add both accounts to the new set
Set<Account> accountSet = new Set<Account>{a1, a2};
// Verify that the set contains two items
System.assertEquals(accountSet.size(), 2);