[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2021-04-28 UTC."],[],[],null,["# UserIdentifier\n\npublic abstract class **UserIdentifier** extends Object \n\n|---|---|---|\n| Known Direct Subclasses [EmailIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/EmailIdentifier), [PhoneIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/PhoneIdentifier), [ProviderIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/ProviderIdentifier), [UidIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/UidIdentifier) |--------------------------------------------------------------------------------------------------------|-------------------------------------------------| | [EmailIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/EmailIdentifier) | Used for looking up an account by email. | | [PhoneIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/PhoneIdentifier) | Used for looking up an account by phone number. | | [ProviderIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/ProviderIdentifier) | Used for looking up an account by provider. | | [UidIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/UidIdentifier) | Used for looking up an account by uid. | |||\n\nIdentifies a user to be looked up. \n\n### Public Constructor Summary\n\n|---|-------------------------------------------------------------------------------------------------------------------|\n| | [UserIdentifier](/docs/reference/admin/java/reference/com/google/firebase/auth/UserIdentifier#UserIdentifier())() |\n\n### Public Method Summary\n\n|-----------------|-------------------------------------------------------------------------------------------------------|\n| abstract String | [toString](/docs/reference/admin/java/reference/com/google/firebase/auth/UserIdentifier#toString())() |\n\n### Inherited Method Summary\n\nFrom class java.lang.Object \n\n|------------------|---------------------------|\n| Object | clone() |\n| boolean | equals(Object arg0) |\n| void | finalize() |\n| final Class\\\u003c?\\\u003e | getClass() |\n| int | hashCode() |\n| final void | notify() |\n| final void | notifyAll() |\n| String | toString() |\n| final void | wait(long arg0, int arg1) |\n| final void | wait(long arg0) |\n| final void | wait() |\n\nPublic Constructors\n-------------------\n\n#### public\n**UserIdentifier**\n()\n\n\u003cbr /\u003e\n\nPublic Methods\n--------------\n\n#### public abstract String\n**toString**\n()\n\n\u003cbr /\u003e"]]
