JDK8/Java8源码在线阅读

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 * accompanied this code).
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package javax.security.sasl;

import javax.security.auth.callback.ChoiceCallback;

/**
  * This callback is used by {@code SaslClient} and {@code SaslServer}
  * to obtain a realm given a list of realm choices.
  *
  * @since 1.5
  *
  * @author Rosanna Lee
  * @author Rob Weltman
  */
public class RealmChoiceCallback extends ChoiceCallback {

    /**
     * Constructs a {@code RealmChoiceCallback} with a prompt, a list of
     * choices and a default choice.
     *
     * @param prompt the non-null prompt to use to request the realm.
     * @param choices the non-null list of realms to choose from.
     * @param defaultChoice the choice to be used as the default choice
     * when the list of choices is displayed. It is an index into
     * the {@code choices} array.
     * @param multiple true if multiple choices allowed; false otherwise
     * @throws IllegalArgumentException If {@code prompt} is null or the empty string,
     * if {@code choices} has a length of 0, if any element from
     * {@code choices} is null or empty, or if {@code defaultChoice}

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