a. Create an application named Numbers whose main() method holds two integer variables....

a. Create an application named Numbers whose main() method holds two integer variables. Assign values to the variables. Pass both variables to methods named sum ( ) and difference(). Create the methods sum() and difference(); they compute the sum of and difference between the values of two arguments, respectively. Each method should perform the appropriate computation and display the results. Save the application as Numbers.java.

b. Add a method named product() to the Numbers class. The product() method should compute the multiplication product of two integers, but not display the answer. Instead, it should return the answer to the calling method, which displays the answer. Save the application as Numbers2.java.