Population data Program plan: • Declare a function named “main()”. Inside the function, ○ Use the “try…except” block to read the population from the file. ○ Create a file object “fileObj” for the file “USPopulation.txt” ○ Now, read the populations from the file and store it in “populationList” and close the file. ○ Use a “for” loop to convert the populations into “float” type. ○ Create an empty list “populationChange” to hold the changes in the population. ○ Now, use the “for” loop to find the population change for the successive years and store it in “populationChange”. ○ Call the function “max()” to find the greatest population change. ○ Call the function “index()” to find the position of the greatest population change. ○ Call the function “min()” to find the lowest population change. ○ Call the function “index()” to find the position of the lowest population change. ○ Then, call the function “sum()” to find the sum of the population changes in the “populationChange”. ○ Find the average annual change. ○ Now, print the average annual change, greatest population change year, and lowest population change year using the “print()” function. ○ Handle the exceptions if any occurred using the “except” blocks. • In the last, call the function “main()” to execute the program.

Question

Please answer JAVA OOP problem below: Assume you have three data definition classes, Person, Student and Faculty. The Student and Faculty classes extend Person. Given the code snippet below, in Java, complete the method determinePersonTypeCount to print out how many Student and Faculty objects exist within the Person array. You may assume that each object within the Person[] is either referencing a Student or Faculty object. public static void determinePersonTypeCount(Person[] people){ // Place your code here }

Answer 1

Question

Chapter 7, Problem 9PE

Program Plan Intro

Population data

Program plan:

• Declare a function named “main()”. Inside the function,

○ Use the “try…except” block to read the population from the file.

○ Create a file object “fileObj” for the file “USPopulation.txt”

○ Now, read the populations from the file and store it in “populationList” and close the file.

○ Use a “for” loop to convert the populations into “float” type.

○ Create an empty list “populationChange” to hold the changes in the population.

○ Now, use the “for” loop to find the population change for the successive years and store it in “populationChange”.

○ Call the function “max()” to find the greatest population change.

○ Call the function “index()” to find the position of the greatest population change.

○ Call the function “min()” to find the lowest population change.

○ Call the function “index()” to find the position of the lowest population change.

○ Then, call the function “sum()” to find the sum of the population changes in the “populationChange”.

○ Find the average annual change.

○ Now, print the average annual change, greatest population change year, and lowest population change year using the “print()” function.

○ Handle the exceptions if any occurred using the “except” blocks.

• In the last, call the function “main()” to execute the program.

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