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Added in API level 1

Summary: Methods

Guard

public interface Guard

java.security.Guard

Known indirect subclasses

AllPermission, AuthPermission, BasicPermission, FilePermission, LinkPermission, LoggingPermission, NetPermission, Permission, PrivateCredentialPermission, PropertyPermission, ReflectPermission, RuntimePermission, SQLPermission, SSLPermission, SecurityPermission, SerializablePermission, SocketPermission, UnresolvedPermission

AllPermission	Android doesn't support `SecurityManager`.
AuthPermission	Legacy security code; do not use.
BasicPermission	Android doesn't support `SecurityManager`.
FilePermission	Legacy security code; do not use.
LinkPermission	The `Permission` class for link creation operations.
LoggingPermission	Legacy security code; do not use.
NetPermission	Legacy security code; do not use.
Permission	Android doesn't support `SecurityManager`.
PrivateCredentialPermission	Legacy security code; do not use.
PropertyPermission	Legacy security code; do not use.
ReflectPermission	Legacy security code; do not use.
RuntimePermission	Legacy security code; do not use.
SQLPermission	Legacy security code; do not use.
SSLPermission	Legacy security code; do not use.
SecurityPermission	Legacy security code; do not use.
SerializablePermission	This legacy security is not supported on Android.
SocketPermission	Legacy security code; do not use.
UnresolvedPermission	Legacy security code; do not use.

This interface represents a guard, which is an object that is used to protect access to another object.

This interface contains a single method, checkGuard, with a single object argument. checkGuard is invoked (by the GuardedObject getObject method) to determine whether or not to allow access to the object.

See also:

GuardedObject

Summary

Public methods
`abstract void`	`checkGuard(Object object)` Determines whether or not to allow access to the guarded object `object`.

Public methods

checkGuard

Added in API level 1

public abstract void checkGuard (Object object)

Determines whether or not to allow access to the guarded object object. Returns silently if access is allowed. Otherwise, throws a SecurityException.

Parameters
`object`	`Object`: the object being protected by the guard.

Throws
`SecurityException`	if access is denied.

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-08-03 UTC.

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