<li>{@code substring(string, start, [end])}: Returns a substring of the given string.</li>
            <li>{@code indexOf(string, substring)}: Returns the index of the first occurrence of substring in string, or -1 if not found.</li>
            <li>{@code contains(string, substring)}: Checks if the string contains the substring.</li>

public static boolean equals(String, String); public static boolean equalsIgnoreCase(String, String); public static int indexOfAny(String, String[]); public static int lastIndexOfAny(String, String[]); public static String substring(String, int); public static String substring(String, int, int); public static String left(String, int); public static String right(String, int); public static String mid(String, int, int); public static String[] split(String); public static String[] split(String, String);...