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.