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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.util;

/**
 * An interface defining a list of strings.
 */
public interface StringList
    extends Iterable
{
    /**
     * Add a String to the list.
     *
     * @param s the String to add.
     * @return true
     */
    boolean add(String s);

    /**
     * Get the string at index index.
     *
     * @param index the index position of the String of interest.
     * @return the String at position index.
     */
    String get(int index);

    int size();

    /**
     * Return the contents of the list as an array.
     *
     * @return an array of String.
     */
    String[] toStringArray();

    /**
     * Return a section of the contents of the list. If the list is too short the array is filled with nulls.
     *
     * @param from the initial index of the range to be copied, inclusive
     * @param to the final index of the range to be copied, exclusive.
     * @return an array of length to - from
     */
    String[] toStringArray(int from, int to);
}