Chapter 10, Problem 11PE

Program Plan Intro

Making “Measurer” into an inner class inside “main()”

Program plan:

• In a file “Measurer.java”,
  • Create a package,
  • Create an interface “Measurer”,
    • Declare a method “measure()”.
• In a file “Data.java”, create a package and then a class “Data”,
  • Define a method “average()”,
    • Initialize the “sum” variable.
    • Create “for” loop to iterate objects,
      • Update sum value.
        • Check whether the value is positive,
        • • Return the value.
        • Otherwise,
        • • Return “0”.
  • Define a method “max()”,
    • Check whether the measure of object is “0”,
      • If it is true, return null value.
        • Assign the first object’s value to the maximum measure.
        • Make “for” loop to traverse objects,
        • • Check whether the current object measure is greater than the maximum object measure.
            • If it is true, assign the maximum measures of object.
        • Return the value that has maximum measures.
• In a file “PerimeterTest.java”, create a package and then a class “PerimeterTest”,
  • Define the method “main()”,
    • Create a class “PerimeterMeasurer” that implements “Measurer” interface,
      • Define a method “measure()”,
        • Assign the object properties to “Rectangle” object.
        • Compute the perimeter.
        • Return the perimeter.
    • Create object for “PerimeterMeasurer” class.
    • Create an array of objects for “Rectangle” class.
    • Call the constructor for “3” times with different values.
    • Print the average and expected perimeter.
    • Assign the maximum measure returned from the method “max()”.
    • Print the largest and expected largest perimeter.