public void | handle(javax.security.auth.callback.Callback[] callbacks)Handles the actual {@link Callback}. A {@code CallbackHandler} needs to
implement this method. In the method, it is free to select which {@code
Callback}s it actually wants to handle and in which way. For example, a
console-based {@code CallbackHandler} might choose to sequentially ask
the user for login and password, if it implements these {@code Callback}
s, whereas a GUI-based one might open a single dialog window for both
values. If a {@code CallbackHandler} is not able to handle a specific
{@code Callback}, it needs to throw an
{@link UnsupportedCallbackException}.
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