Write a java class called T1B1 in package labT1 which has a single
private field called "data" which is an Array of doubles.

Write a single creator for your T1B1 class which takes a single integer
parameter. The creator should then istantiate the "data" array to be an 
array of doubles whose size is specified by the value of the parameter.
In other words, if the parameter has the value 5, then the data array
should have five doubles as values. Your creator should then fill in
the data array with values that follow the following rules. The last
element of the data array may be whatever value you want, but the remaining
elements must differ by exactly 3. In other words, data[i]-data[i+1] must be 3.0
for i=0 up to n-3. The values in the data array may be positive or negative 
numbers, but the sum of all elements should be equal (or very close to... within
double floating point precision) the original parameter value.

Write a method for the T1B1 class called "average" which returns
the average of your array (the sum of all the elements divided by 
the number of elements.)

Write a method for the T1B1 class called "toString" which returns a 
String that contains an open square bracket followed by a blank, 
followed by each element of the data array in index order, separated 
by a comma and a single blank. The last element of the array should be 
followed by a single blank and then a right square bracket.

Write a "main" method for your T1B1 class that tests your creator, the 
average method, and the toString method. Remember, a main method starts 
out as...

	public static void main(String[] args) {...