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package java.security;



A computation to be performed with privileges enabled. The computation is performed by invoking AccessController.doPrivileged on the PrivilegedAction object. This interface is used only for computations that do not throw checked exceptions; computations that throw checked exceptions must use PrivilegedExceptionAction instead. 
See Also:
Since:1.2
/**
 * A computation to be performed with privileges enabled.  The computation is
 * performed by invoking {@code AccessController.doPrivileged} on the
 * {@code PrivilegedAction} object.  This interface is used only for
 * computations that do not throw checked exceptions; computations that
 * throw checked exceptions must use {@code PrivilegedExceptionAction}
 * instead.
 *
 * @since 1.2
 * @see AccessController
 * @see AccessController#doPrivileged(PrivilegedAction)
 * @see PrivilegedExceptionAction
 */

public interface PrivilegedAction<T> {
    
Performs the computation. This method will be called by AccessController.doPrivileged after enabling privileges. 
See Also:
Returns:a class-dependent value that may represent the results of the computation. Each class that implements PrivilegedAction should document what (if anything) this value represents.
/**
     * Performs the computation.  This method will be called by
     * {@code AccessController.doPrivileged} after enabling privileges.
     *
     * @return a class-dependent value that may represent the results of the
     *         computation. Each class that implements
     *         {@code PrivilegedAction}
     *         should document what (if anything) this value represents.
     * @see AccessController#doPrivileged(PrivilegedAction)
     * @see AccessController#doPrivileged(PrivilegedAction,
     *                                     AccessControlContext)
     */
    T run();
}