Java: An Introduction to Problem Solving and Programming (7th Edition)
Java: An Introduction to Problem Solving and Programming (7th Edition)
7th Edition
ISBN: 9780133766264
Author: Walter Savitch
Publisher: PEARSON
Question
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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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Chapter 12 Solutions

Java: An Introduction to Problem Solving and Programming (7th Edition)

Ch. 12.1 - Prob. 12STQCh. 12.2 - Prob. 13STQCh. 12.2 - Prob. 14STQCh. 12.2 - Prob. 15STQCh. 12.2 - Prob. 16STQCh. 12.3 - Prob. 17STQCh. 12.3 - Prob. 18STQCh. 12.3 - Prob. 19STQCh. 12.3 - Write a definition of a method isEmpty for the...Ch. 12.3 - Prob. 21STQCh. 12.3 - Prob. 22STQCh. 12.3 - Prob. 23STQCh. 12.3 - Prob. 24STQCh. 12.3 - Redefine the method getDataAtCurrent in...Ch. 12.3 - Repeat Question 25 for the method...Ch. 12.3 - Repeat Question 25 for the method...Ch. 12.3 - Repeat Question 25 for the method...Ch. 12.4 - Revise the definition of the class ListNode in...Ch. 12.4 - Prob. 30STQCh. 12 - Repeat Exercise 2 in Chapter 7, but use an...Ch. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Repeat Exercises 6 and 7 in Chapter 7, but use an...Ch. 12 - Write a static method removeDuplicates...Ch. 12 - Write a static method...Ch. 12 - Write a program that will read sentences from a...Ch. 12 - Repeat Exercise 12 in Chapter 7, but use an...Ch. 12 - Write a program that will read a text file that...Ch. 12 - Revise the class StringLinkedList in Listing 12.5...Ch. 12 - Prob. 12ECh. 12 - Write some code that will use an iterator to...Ch. 12 - Prob. 14ECh. 12 - Write some code that will use an iterator to...Ch. 12 - Prob. 17ECh. 12 - Revise the method selectionSort within the class...Ch. 12 - Repeat the previous practice program, but instead...Ch. 12 - Repeat Practice Program 1, but instead write a...Ch. 12 - Write a program that allows the user to enter an...Ch. 12 - Write a program that uses a HashMap to compute a...Ch. 12 - Write a program that creates Pet objects from data...Ch. 12 - Repeat the previous programming project, but sort...Ch. 12 - Repeat the previous programming project, but read...Ch. 12 - Prob. 9PPCh. 12 - Prob. 10PPCh. 12 - Prob. 11PPCh. 12 - Prob. 12PPCh. 12 - Prob. 13PPCh. 12 - Prob. 14PPCh. 12 - Prob. 15PP
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