Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 18, Problem 5PP
Program Plan Intro

Finding largest element in an array list

Program plan:

Filename: “Measurable.java”

This code snippet creates an interface “Measurable”. In the code,

  • Import the required packages.
  • Define a class “Measurable”.
    • Define the class member “getMeasure()”.
    • Define the method “largest()”.
      • If the size of the “objects” is equal to 0,
        • Return a value “null”.
      • Declare a variable “largest” and set its value.
      • Iterate a “for” loop,
        • If “obj” is less than “largest”,
          • Set “largest” equal to “obj”.
      • Return “largest”.

Filename: “BankAccount.java”

This code snippet creates a class “BankAccount”. In the code,

  • Define a class “BankAccount”.
    • Define the class member “balance”.
    • Define the constructor “BankAccount()”.
      • Set the value of “balance”.
    • Define the method “deposit()”.
      • Set the value of “balance”.
    • Define the method “withdraw()”.
      • Set the value of “balance”.
    • Define the method “getBalance()”.
      • Return the value of “balance”.
    • Define the method “getMeasure()”.
      • Return the value of “balance”.

Filename: “SavingsAccount.java”

This code snippet creates a class “SavingsAccount”. In the code,

  • Define a class “SavingsAccount” by extending class “BankAccount”.
    • Define the class member “interestRate”.
    • Define the method “SavingsAccount()”.
      • Set the value of “initial” of class “BankAccount”.
      • Set the value of “interestRate”.
    • Define the method “monthEnd()”.

Filename: “MeasurableTester.java”

This code snippet creates a class “MeasurableTester”. In the code,

  • Define a class “MeasurableTester”.
    • Define the “main” method.
      • Define an array list “accounts” and set the objects to it.
      • Add elements to “accounts”.
      • Call the method “largest()” and save the value to “largestAccount”.
      • Call the method “getBalance()” and print the value.
      • Print the expected value.
      • Define an array list “saccounts” and set the objects to it.
      • Add elements to “saccounts”.
      • Call the method “largest()” and save the value to “largestSavings”.
      • Call the method “getBalance()” and print the value.
      • Print the expected value.
      • Define an array list “all” and set the objects to it.
      • Add elements of “accounts” to “all”.
      • Add elements of “accounts” to “all”.
      • Call the method “largest()” and save the value to “largestAll”.
      • Call the method “getBalance()” and print the value.
      • Print the expected value.

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