PrincipalComparator (Java SE 11 & JDK 11 )
Keywords: com.sun.security.auth.PrincipalComparator interface

Module jdk.security.auth
Package com.sun.security.auth

## Interface PrincipalComparator

-     public interface PrincipalComparator

  An object that implements the `java.security.Principal` interface typically also implements this interface to provide a means for comparing that object to a specified `Subject`.

  The comparison is achieved via the `implies` method. The implementation of the `implies` method determines whether this object "implies" the specified `Subject`. One example application of this method may be for a "group" object to imply a particular `Subject` if that `Subject` belongs to the group. Another example application of this method would be for "role" object to imply a particular `Subject` if that `Subject` is currently acting in that role.

  Although classes that implement this interface typically also implement the `java.security.Principal` interface, it is not required. In other words, classes may implement the `java.security.Principal` interface by itself, the `PrincipalComparator` interface by itself, or both at the same time.

  See Also:
    `Principal`, `Subject`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | `implies​(Subject subject)` | Check if the specified `Subject` is implied by this object.

- - ### Method Detail

    - #### implies

          boolean implies​(Subject subject)

      Check if the specified `Subject` is implied by this object.
      Returns:
        true if the specified `Subject` is implied by this object, or false otherwise.