This interface represents a guard, which is an object that is used to protect access to another object. 该接口表示守卫，即用于保护对其它对象访问的对象。
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. 该接口只包含一个checkGuard方式，只有一个object参数。由GuardedObject的getObject方式调用checkGuard来确定是否答应访问该对象。
See Also:
GuardedObject
Method Summary
void
checkGuard(Object object) Determines whether or not to allow access to the guarded object object. 确定是否答应访问受保护的对象object。
Method Detail
checkGuard
public void checkGuard(Object object) throws SecurityException
Determines whether or not to allow access to the guarded object object. Returns silently if access is allowed. Otherwise, throws a SecurityException. 确定是否答应访问受保护的对象object。假如访问答应，正常返回，否则抛出SecurityException。
Parameters:
object - the object being protected by the guard. 受保护的对象。
Throws:
SecurityException - if access is denied. 假如访问被拒绝抛出。
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