Count number of poor family using “ArrayList” Program Plan: “Family.java”: Declare required variables. Define constructor for “Family” class. Assign “income” to new variable “newIncome”. Assign “size” to new variable “nSize”. Define method “isPoor” with two arguments “housingCost” and “foodCost”. This method returns “true” if the value of “housingCost + foodCost * size” is greater than half of income. Otherwise returns “false”. Define method “toString” which is used to returns the given statement with “size” and “income”. “CountPoor.java”: Import required package. Define “CountPoor” class. Define main function. Create object for scanner class. Create array for “incomeValues” using “ArrayList”. Display prompt statement for number of families. Assign “additionalData” to “true”. Set “index” to “0”. Read income and size for each family using “while” loop. Display prompt statement for each family. If user input has next double, then Read income and size of each family from user. Add income values and size to “Family” class using “add” method. Otherwise, assign “additionalData” to “false” and then finish reading data from user. Display prompt statement for average housing cost and food cost. Read the average house cost and food cost from user. Initializes the count value to “0”. Compute the number of poor family using “for” loop. Check if the given family is poor by using “isPoor” function. If it is, then increment the count value and display poor family details using “get” method. Finally display the count of poor family.

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Chapter 12, Problem 2E

Program Plan Intro

Count number of poor family using “ArrayList”

Program Plan:

“Family.java”:

Declare required variables.

Define constructor for “Family” class.

Assign “income” to new variable “newIncome”.

Assign “size” to new variable “nSize”.

Define method “isPoor” with two arguments “housingCost” and “foodCost”.

This method returns “true” if the value of “housingCost + foodCost * size” is greater than half of income. Otherwise returns “false”.

Define method “toString” which is used to returns the given statement with “size” and “income”.

“CountPoor.java”:

Import required package.

Define “CountPoor” class.

Define main function.

Create object for scanner class.

Create array for “incomeValues” using “ArrayList”.

Display prompt statement for number of families.

Assign “additionalData” to “true”.

Set “index” to “0”.

Read income and size for each family using “while” loop.

Display prompt statement for each family.

If user input has next double, then

Read income and size of each family from user.

Add income values and size to “Family” class using “add” method.

Otherwise, assign “additionalData” to “false” and then finish reading data from user.

Display prompt statement for average housing cost and food cost.

Read the average house cost and food cost from user.

Initializes the count value to “0”.

Compute the number of poor family using “for” loop.

Check if the given family is poor by using “isPoor” function.

If it is, then increment the count value and display poor family details using “get” method.

Finally display the count of poor family.

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