no library classes

* * * /* * Input Parameters: sa': an array of strings * Assumptions: Input array sa' is non-empty and contains at least one elements. - The string value that appears the most frequently is unique. * What to return? - Return the string value that appears the most frequently, i.e., appear for the highest number of times. * See the JUnit tests related to this method. */ public static String task4(String[] a) { { String result = null; *