| Package | Description | 
|---|---|
| java.nio.file | Defines interfaces and classes for the Java virtual machine to access files,
 file attributes, and file systems. | 
| Modifier and Type | Method and Description | 
|---|---|
| abstract UserPrincipalLookupService | FileSystem. getUserPrincipalLookupService()Returns the  UserPrincipalLookupServicefor this file system
 (optional operation). | 
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