2 Dimensional Array, Utility Class, and Accumulator Object

Two Dimensional array

Write a program that:

• Queries the user to enter two integer numbers; one representing the number of rows in a two dimensional array and the other the number of columns. Dynamically create the two dimensional array Iterate through this array and:
  • if the row index = 0, place a '0' in the element
  • if the column index = 0, place an 'a' in the element
  • if both the row index and column index are even place an 'x' in the element
  • if both the row index and column index are odd place a 'y' in the element
  • place a 'b' in all other elements
• Iterate through the array and count and present to the user the number of each value ('0','a','b','x','y') present in the array.
• Iterate through the array and display its contents in a logical manner on the standard output device

Utility Class Homework

create a Utility class containing three methods that can be called without instantiation. The three classes are:

• String queryUserForString(String title, String message) A method that displays the message message in a JOptionPane dialog having the title title and returns the string entered by the user.
• long queryUserForInteger(String title, String message) A method that displays the message message in a JOptionPane dialog having the title title and returns the integer value entered by the user.
• double queryUserForDouble(String title, String message) A method that displays the message message in a JOptionPane dialog having the title title and returns the floating point value entered by the user.

Accumulator Object

Create the class definition for this accumulator object. Make sure you:

• have a constructor that initializes the accumulator to 0
• an appropriate mutator method for each instance variable
• an appropriate accessor method for each instance variable
• a method called with the prototype void add(int value) that adds the value value to the accumulator only if value is > 0