Chapter 25, Problem 1PP

Program Plan Intro

Application with DTD and XML

Program plan:

• In the file “Country.java”, create a class “Country”,
  • Declare necessary variables.
  • Define the constructor.
  • Define the method “getName()” that returns the name of the country.
  • Define the method “getPopulation()” that returns the population of the country.
  • Define the method “getArea()” that returns the area of the country.
  • Define the method “getPopulationDensity()” that returns the population density of the country.
  • Define a method “readValues()” to read a series of positive integers from input and construct an array list out of them.
• In the file “CountriesParser.java”, import necessary packages, and create a class “CountriesParser”,
  • Declare necessary instance variables.
  • Define the constructor that construct a parser that can parse a countries XML file.
  • Define the method “parse()” that parse an XML file containing a countries XML file
• In the file “CountryDataAnalyzer.java”, import necessary packages, and create a class “CountryDataAnalyzer”,
  • Define the method “main()”,
    • Create an object for “CountriesParser”.
    • Get the command-line input in “ArrayList”.
    • Define the Comparator class for area.
    • Define the Comparator class for population.
    • Define the Comparator class for population density.