ESc101 Laboratory Assignment
                      for Thursday of week of 27-9-04


This week you may use all the features of Java taught in the class 
including Array and Vector classes.

Problem1: Write methods for each of the following problems. DO NOT
WRITE THEM AS A PART OF THE main METHOD OF A CLASS. SIMPLY WRITE THESE
METHODS INDEPENDENT OF ANY CLASS. SUBSEQUENTLY WRITE A CLASS AND A main
METHOD AND THIS METHOD AS IT'S MEMBER AND CALL THIS METHOD FROM main TO TEST IT.

(a) method symbolSum
    Input Parameters: a String array "wordList", a positive integer "n"
                      where "wordList" has at least "n" entries. 
    Output: the total number of characters in the first "n" Strings
            of "wordList".

(b) method interval
    Input Parameters: a String array "wordList", a positive integer "n"
                      where "wordList" has at least "n" entries.
    Output: a String array containing "wordList" which start with
            a letter between "d" and "t" (both letters inclusive).

(c) method searcher
    Input Parameter: a String array "wordList", a positive integer "n"
                     where "wordList" has at least "n" entries.
    Behaviour: This method pops a window and asks for a String x.
               Then it searches "wordList" and tells the user whether
               any word in wordList ends with substring x. Then it 
               asks if the user wants to search more. This cycle 
               continues until user says he/she does not want to 
               search any more.
    Note: Use ResponseBox class of javabook to decide
          whether user wants to continue with the search or not.


The next problem may be done in the remaining time and during the
following week but make sure that it is complete before the next 
lab. Next week's problem may depend on it.

Problem2: Define a class "Date" as follows

Member Data:
1) day
2) month
3) year
define each data to be private.

Constructors:
1) a constructor which take (int d, int m, int y) and sets
   the data PROVIDED IT IS A VALID DATE.
2) a default constructor.

Methods
1) set(int d, int m, int y). It sets the data PROVIDED IT IS 
   A VALID DATE.
2) getDay
3) getMonth
4) getYear
5) earlier(Date x). It returns true if "own" date is earlier
   than or equal to the date x.