Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 9, Problem 19PP
Program Plan Intro

Filter that retains all the objects

Program plan:

  • In a file “Filter.java”, create an interface “Filter”,
    • Declare the method “accept()”.
    • Define the method “retainAll()”.
      • Initialize the variable.
      • Make loop for objects,
        • Check the condition,
          • Assign the object properties.
          • Increment the value by “1”.
      • Create a loop,
        • Assign the properties of objects accepted by filter.
      • Create a loop,
        • Fill the array that contains other objects, with null value.
  • In a file “Measurer.java”, create an interface “Measurer”,
    • Declare the method “measure()”,
  • In a file “BalanceFilter.java”, create a class “BalanceFilter” that implements “Filter” interface,
    • Define the method “accept()”,
      • Return the balance greater than “1000”.
  • In a file “BalanceMeasurer.java”, create a class “BalanceMeasurer” that implements “Measurer” interface,
    • Define the method “measure()”,
      • Return the value obtained from the method “getBalance()”.
  • In a file “BankAccount.java”, create a class “BankAccount”,
    • Declare the variable.
    • Define the constructor to create a bank account with “0” balance.
    • Define the parameterized constructor to set the specified balance.
    • Define the method “deposit()” to update the balance with the deposited amount.
    • Define the method “withdraw()” to update the balance with withdrawal amount.
    • Define the method “getBalance()” to return the current balance.
    • Define the method “addInterest()”,
      • Add the interest to the bank balance.
  • In a file “Data.java”, create a class “Data”,
    • Define the method “average()”,
      • Initialize the variable.
      • Make the loop for the objects,
        • Check the condition,
          • Update sum value.
          • Increment the value of “number”.
      • Check whether the value is positive,
        • If it is true, return the value obtained by dividing sum by the value “number”.
      • Otherwise, return “0”.
  • In a file “FilterTester.java”, create a class “FilterTester”,
    • Define the method “main()”,
      • Create an array of objects for “BankAccount” class.
      • Call the constructor with “900” as parameter.
      • Call the constructor with “3000” as parameter.
      • Call the constructor with “300” as parameter.
      • Call the constructor with “5000” as parameter.
      • Call the constructor with “1000” as parameter.
      • Create an object for “BalanceMeasure”.
      • Create an object for “BalanceFilter”.
      • Print the value returned from “average()”.
      • Print the expected average value.
      • Call the method “retainAll()”.
      • Print the message string.
      • Create  a loop,
        • Check the condition,
          • Print the value returned from the method “getBalance()”.
      • Print the expected values.

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Big Java Late Objects

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