Method toStringArray

api/src/main/java/io/jsonwebtoken/lang/Strings.java:985–990

Copy the given Collection into a String array. The Collection must contain String elements only. @param collection the Collection to copy @return the String array ( null if the passed-in Collection was null )

(Collection<String> collection)

     * Collection was <code>null</code>)
     */
    public static String[] toStringArray(Collection<String> collection) {
        if (collection == null) {
            return null;
        }
        return collection.toArray(new String[collection.size()]);
    }

    /**
     * Copy the given Enumeration into a String array.