Program plan: LargestCountry.java: Define a class named “LargestCountry”. Define a function named “readCountry” with type “Country”. Using the “Print” statement, prompt the user to enter the country name. Using the scanner class, create an object “in” for reading the input values. Using “next()” method gets the next string and store it into the variable “name”. Using the “if” conditional statement, check whether the value of “name” is not equal to “quit”. If the condition is true, then prompt the user to enter the country population. Using the “nextInt()” method gets the next integer and store it into the variable “population”. Using the “Print” statement, prompt the user to enter the country area. Using the “nextDouble()” method gets the next double and store into the variable “area”. Return a country “name”, “population”, and “area”. Return “null” Define a main function. Create an object named “largestArea” of class country. Create an object named “largestPopulation” of class country. Create an object named “largestDensity” of class country. Call the function “readCountry” and store the result into the object “b”. Execute “While” block and check whether the value of “b” is not equal to “null”. Using the “if” conditional statement, call the function “largerArea” and find the largest area. If the condition is true, then store the largest area into the variable “largestArea”. Using the “if” conditional statement, call the function “largerPopulation” and find the largest population. If the condition is true, then store the largest population into the variable “largestPopulation”. Using the “if” conditional statement, call the function “largerDensity” and find the largest density. If the condition is true, then store the largest density into the variable “largestDensity”. Call the function “readCountry” and store the result into the object “b”. Using the “Print” statement, call the function “largestArea” and display the largest area. Using the “Print” statement, call the function “largestPopulation” and display the largest population. Using the “Print” statement, call the function “largestDensity” and display the largest density. Country.java: Define a class named “Country” for holding country information. Declare three variables “name”, “population”, and “area”. Create a constructor with three arguments. Assign the value of the variable “name” into the variable “this.name”. Assign the value of the variable “population” into the variable “this.population”. Assign the value of the variable “area” into the variable “this.area”. Define a function named “printCountry” and print the country name, population and area. Define a double function named “getPopulationDensity” Using the “if” conditional statement, check whether “area” is not equal to “0”. If the condition is true, then return population density. Else return “0”. Define a boolean function named “largerPopulation” for finding which country has a larger population. Return true if “this.population” is greater than “b.population”. Define a boolean function named “largerDensity” for finding which country has larger population density. Return true if “this.getPopulationDensity” is greater than “b.getPopulationDensity”. Define a boolean function named “largerArea” for finding which country has a larger area. Return true if “this.area” is greater than “b.area”.

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Chapter 8, Problem 14PP

Program Plan Intro

Program plan:

LargestCountry.java:

Define a class named “LargestCountry”.

Define a function named “readCountry” with type “Country”.

Using the “Print” statement, prompt the user to enter the country name.

Using the scanner class, create an object “in” for reading the input values.

Using “next()” method gets the next string and store it into the variable “name”.

Using the “if” conditional statement, check whether the value of “name” is not equal to “quit”.

If the condition is true, then prompt the user to enter the country population.

Using the “nextInt()” method gets the next integer and store it into the variable “population”.

Using the “Print” statement, prompt the user to enter the country area.

Using the “nextDouble()” method gets the next double and store into the variable “area”.

Return a country “name”, “population”, and “area”.

Return “null”

Define a main function.

Create an object named “largestArea” of class country.

Create an object named “largestPopulation” of class country.

Create an object named “largestDensity” of class country.

Call the function “readCountry” and store the result into the object “b”.

Execute “While” block and check whether the value of “b” is not equal to “null”.

Using the “if” conditional statement, call the function “largerArea” and find the largest area.

If the condition is true, then store the largest area into the variable “largestArea”.

Using the “if” conditional statement, call the function “largerPopulation” and find the largest population.

If the condition is true, then store the largest population into the variable “largestPopulation”.

Using the “if” conditional statement, call the function “largerDensity” and find the largest density.

If the condition is true, then store the largest density into the variable “largestDensity”.

Call the function “readCountry” and store the result into the object “b”.

Using the “Print” statement, call the function “largestArea” and display the largest area.

Using the “Print” statement, call the function “largestPopulation” and display the largest population.

Using the “Print” statement, call the function “largestDensity” and display the largest density.

Country.java:

Define a class named “Country” for holding country information.

Declare three variables “name”, “population”, and “area”.

Create a constructor with three arguments.

Assign the value of the variable “name” into the variable “this.name”.

Assign the value of the variable “population” into the variable “this.population”.

Assign the value of the variable “area” into the variable “this.area”.

Define a function named “printCountry” and print the country name, population and area.

Define a double function named “getPopulationDensity”

Using the “if” conditional statement, check whether “area” is not equal to “0”.

If the condition is true, then return population density.

Else return “0”.

Define a boolean function named “largerPopulation” for finding which country has a larger population.

Return true if “this.population” is greater than “b.population”.

Define a boolean function named “largerDensity” for finding which country has larger population density.

Return true if “this.getPopulationDensity” is greater than “b.getPopulationDensity”.

Define a boolean function named “largerArea” for finding which country has a larger area.

Return true if “this.area” is greater than “b.area”.

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